WO2019098369A1 - 酸化物半導体薄膜 - Google Patents
酸化物半導体薄膜 Download PDFInfo
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Definitions
- the present invention relates to an oxide semiconductor thin film containing In, Zn, Ti and Sn.
- a thin film transistor (Thin-Film Transistor) using an In-Ga-Zn-O-based oxide semiconductor film (IGZO) as an active layer is higher than a thin film transistor using a conventional amorphous silicon film as an active layer.
- IGZO In-Ga-Zn-O-based oxide semiconductor film
- Patent Document 1 discloses an organic EL display device in which an active layer of a TFT for driving an organic EL element is made of IGZO.
- Patent Document 2 discloses a thin film transistor having a channel layer (active layer) of a-IGZO and having a mobility of 5 cm 2 / Vs or more.
- Patent Document 3 discloses a thin film transistor having an active layer of IGZO and an on / off current ratio of 5 digits or more.
- JP 2009-31750 A JP, 2011-216574, A WO 2010/092810
- an oxide semiconductor thin film is formed of an oxide semiconductor containing In, Zn, Ti and Sn,
- the atomic ratio of (In + Sn) / (In + Zn + Ti + Sn) is 0.36 or more and 0.92 or less,
- the atomic ratio of Sn / (In + Sn) is 0.02 or more and 0.46 or less,
- the atomic ratio of Sn / (In + Zn + Ti + Sn) is 0.01 or more and 0.42 or less,
- the atomic ratio of Ti / (In + Zn + Ti + Sn) is 0.01 or more and 0.10 or less.
- the atomic ratio of (In + Sn) / (In + Zn + Ti + Sn) is 0.48 or more and 0.72 or less, The atomic ratio of Sn / (In + Sn) is 0.03 or more and 0.29 or less, The atomic ratio of Sn / (In + Zn + Ti + Sn) is 0.02 or more and 0.21 or less, The atomic ratio of Ti / (In + Zn + Ti + Sn) may be 0.03 or more and 0.10 or less.
- a thin film transistor according to an embodiment of the present invention includes an active layer formed of the oxide semiconductor thin film having the above structure.
- a thin film transistor having a mobility of 10 cm 2 / Vs or more can be formed.
- the amount of change in threshold voltage is 0 V or more and 2 V or less before and after the test which continues applying a gate voltage of +30 V for 60 minutes at a temperature of 60 ° C.
- it is possible to obtain a thin film transistor in which the amount of change in threshold voltage between before and after the test which continues applying a gate voltage of -30 V for 60 minutes at a temperature of 60 ° C is -2 V or more and 0 V or less.
- a method of manufacturing a thin film transistor according to an aspect of the present invention is a method of manufacturing a thin film transistor including an active layer formed of the oxide semiconductor thin film having the above configuration, Forming a gate insulating film on the gate electrode, The active layer is formed by sputtering on the gate insulating film, Forming a metal layer using the active layer as a base film; The metal layer is patterned by wet etching to form a source electrode and a drain electrode.
- the active layer is made of an oxide semiconductor thin film containing Sn, and thus has excellent chemical resistance. Therefore, the source / drain electrodes can be patterned without forming an etching stopper for protecting the active layer from the etching solution.
- FIG. 1 is a schematic cross-sectional view showing the configuration of a thin film transistor according to an embodiment of the present invention.
- a so-called bottom gate type field effect transistor will be described as an example.
- the thin film transistor 100 of the present embodiment has a gate electrode 11, a gate insulating film 12, an active layer 13, a source electrode 14S, and a drain electrode 14D.
- the gate electrode 11 is made of a conductive film formed on the surface of the substrate 10.
- the substrate 10 is typically a transparent glass substrate.
- the gate electrode 11 is typically formed of a metal single layer film or a metal multilayer film such as molybdenum (Mo), titanium (Ti), aluminum (Al), copper (Cu), etc. .
- the gate electrode 11 is made of molybdenum.
- the thickness of the gate electrode 11 is not particularly limited, and is, for example, 200 nm.
- the gate electrode 11 is formed, for example, by sputtering or vacuum evaporation.
- the active layer 13 functions as a channel layer of the thin film transistor 100.
- the film thickness of the active layer 12 is, for example, 10 nm to 200 nm.
- the active layer 13 is formed of an In—Sn—Ti—Zn—O-based oxide semiconductor thin film containing In (indium), Zn (zinc), Ti (titanium), and Sn (tin).
- the active layer 13 is formed, for example, by sputtering. The specific composition of the said oxide semiconductor thin film is mentioned later.
- the gate insulating film 12 is formed between the gate electrode 11 and the active layer 13.
- the gate insulating film 12 is made of, for example, a silicon oxide film (SiOx), a silicon nitride film (SiNx), or a laminated film of these.
- the film formation method is not particularly limited, and may be a CVD method, a sputtering method, an evaporation method, or the like.
- the thickness of the gate insulating film 12 is not particularly limited, and is, for example, 200 nm to 400 nm.
- the source electrode 14S and the drain electrode 14D are formed apart from each other on the active layer 13.
- the source electrode 14S and the drain electrode 14D can be made of, for example, a metal single-layer film of aluminum, molybdenum, copper, titanium or the like, or a multilayer film of these metals. As described later, the source electrode 14S and the drain electrode 14D can be simultaneously formed by patterning a metal film. The thickness of the metal film is, for example, 100 nm to 200 nm.
- the source electrode 14S and the drain electrode 14D are formed, for example, by a sputtering method, a vacuum evaporation method, or the like.
- the source electrode 14S and the drain electrode 14D are covered with a protective film 15.
- the protective film 15 is made of, for example, an electrically insulating material such as a silicon oxide film, a silicon nitride film, or a laminated film of these.
- the protective film 15 is for shielding the element portion including the active layer 13 from the open air.
- the thickness of the protective film 15 is not particularly limited, and is, for example, 100 nm to 300 nm.
- the protective film 15 is formed, for example, by the CVD method.
- annealing is performed. Thereby, the active layer 13 is activated.
- the annealing conditions are not particularly limited, and in the present embodiment, the annealing is performed at about 300 ° C. for one hour in the air.
- interlayer connection holes for connecting the source / drain electrodes 14S and 14D to wiring layers are provided at appropriate positions.
- the wiring layer is for connecting the thin film transistor 100 to a peripheral circuit (not shown), and is made of a transparent conductive film such as ITO.
- oxide semiconductor thin film [Oxide semiconductor thin film] Then, the oxide semiconductor thin film which comprises the active layer 13 is demonstrated.
- the active layer 13 is formed of an oxide semiconductor thin film containing In, Zn, Ti, and Sn as described above.
- the atomic ratio (atomic ratio of the sum of In and Sn to the total of In, Zn, Ti, and Sn) of (In + Sn) / (In + Zn + Ti + Sn) is 0.36 to 0.92.
- the atomic ratio of Sn / (In + Sn) (atomic ratio of Sn to the sum of In and Sn) is 0.02 or more and 0.46 or less.
- the atomic ratio of Sn / (In + Zn + Ti + Sn) (the atomic ratio of Sn to the total of In, Zn, Ti and Sn) is 0.01 or more and 0.42 or less.
- the atomic ratio of Ti / (In + Zn + Ti + Sn) (the atomic ratio of Ti to the total of In, Zn, Ti and Sn) is 0.01 or more and 0.10 or less.
- the upper limit value and the lower limit value of the composition are values obtained by rounding off the third decimal place (the same applies hereinafter).
- transistor characteristics having a mobility of 10 cm 2 / Vs or more can be obtained.
- the active layer 13 is formed of an oxide semiconductor thin film containing Sn, the active layer 13 excellent in chemical resistance can be formed. Therefore, in the patterning process of the source electrode 14S and the drain electrode 14D, it is not necessary to provide an etching stopper layer for protecting the active layer from the etching solution. As a result, after forming a metal layer using the active layer 13 as a base film, the source electrode 14S and the drain electrode 14D can be easily formed by patterning the metal layer by wet etching.
- PAN Phosphoric Acetic Nitric acid
- PAN solution 1 a mixture of phosphoric acid 75 75%, nitric acid 10 10%, acetic acid 14 14%, water ⁇ 1%) and PAN solution 2 (phosphorus) Acid ⁇ 73%, nitric acid 3 3%, acetic acid 7 7%, water ⁇ 17% mixed solution, and the like.
- the atomic ratio of (In + Sn) / (In + Zn + Ti + Sn) is 0.48 to 0.72, and the atomic ratio of Sn / (In + Sn) is 0.03 to 0.29, It is more preferable that the atomic ratio of Sn / (In + Zn + Ti + Sn) is 0.02 or more and 0.21 or less, and the atomic ratio of Ti / (In + Zn + Ti + Sn) is 0.03 or more and 0.10 or less.
- transistor characteristics having a mobility of 20 cm 2 / Vs or more can be obtained.
- the fluctuation of the threshold voltage can be suppressed to a predetermined voltage or less, so that it is possible to secure a highly reliable switching operation over a long period of time.
- PBTS Bias Temperature Stress
- NBTS Negative Bias Temperature Stress
- the amount of change in threshold voltage between before and after the execution of the PBTS test in which a gate voltage of +30 V is continuously applied for 60 minutes was 0 V or more and 2 V or less.
- the amount of change in threshold voltage between before and after the test which continues to apply a gate voltage of -30 V for 60 minutes at a temperature of 60 ° C. was -2 V or more and 0 V or less.
- the active layer 13 is formed by performing heat treatment (annealing) at a predetermined temperature after forming a film using a sputtering target made of sintered bodies of respective oxides of In, Zn, Ti, and Sn. .
- a sputtering target made of sintered bodies of respective oxides of In, Zn, Ti, and Sn. .
- an oxide semiconductor thin film having the same or substantially the same composition as that of the target is formed.
- an active layer which exhibits transistor characteristics having a mobility of 10 cm 2 / Vs or more is formed.
- the sputtering target is made of a sintered body obtained by using oxides of In, Ti, Zn and Sn such as In 2 O 3 , TiO 2 , ZnO and SnO 2 as raw material powders and mixing them at the above composition ratio. be able to.
- the gate voltage (Vg) at which the drain current (Id) becomes 1E-09 (1.0 ⁇ 10 ⁇ 9 ) A is the threshold voltage (Vth)
- the In—Ga—Zn—O-based oxide thin film While the threshold voltage shifts to the positive side (about 6 V at the maximum) as the voltage application time is longer, the shift amount is 2 V or less in the In-Sn-Ti-Zn-O-based oxide thin film That was confirmed.
- the present inventors have sputtered an In-Ti-Zn-O-based oxide thin film, an In-Sn-Ti-Zn-O-based oxide thin film, and an In-Ga-Zn-O-based oxide semiconductor thin film by sputtering.
- the thin film transistors of the structure shown in FIG. 1 were formed using these films as active layers, and the transfer characteristics (mobility, threshold voltage, PBTS, NBTS) of each transistor were evaluated. Furthermore, film characteristics (carrier density, wet etching rate) of the above-mentioned oxide semiconductor thin film were evaluated.
- the threshold voltage (Vth) was a gate voltage (Vg) at which the drain current (Id) was 1.0 ⁇ 10 ⁇ 9 A.
- PBTS ( ⁇ Vth) is a change in threshold voltage after applying a gate voltage of +30 V for 60 minutes at a temperature of 60 ° C.
- NBTS ( ⁇ Vth) is a change in threshold voltage after applying a gate voltage of ⁇ 30 V for 60 minutes at a temperature of 60 ° C.
- the carrier density was measured by annealing the oxide semiconductor thin film immediately after film formation at 350 ° C. for 1 hour in the air, and then measuring the carrier concentration in the film with a Hall effect measuring instrument.
- the dip method was employed in which the oxide semiconductor thin film immediately after film formation was immersed in a chemical solution (phosphorus acetic acid based etching solution) managed at 40 ° C.
- the substrate temperature is 100 ° C.
- the sputtering gas is a mixed gas of argon and oxygen (oxygen content ratio 7%)
- the film thickness is 50 nm.
- Example 1 Using an In-Ti-Zn-O target, the atomic ratio of each element to the total amount of In, Zn, and Ti was 48 atomic% In, 48 atomic% Zn, and Ti: 4 on the total weight of the glass substrate.
- An In-Ti-Zn-O-based oxide semiconductor thin film having an atomic percentage was manufactured.
- the mobility is 12 cm 2 / Vs
- the threshold voltage (Vth) is 0.4 V
- the PBTS (Vth) is +3.2 V
- the NBTS (Vth) was -0.1 V.
- the carrier density was 5.1E + 16 (5.1 ⁇ 10 16 ) / cm 3
- the etching rate was 4.7 nm / sec.
- Example 2 Using an In-Ti-Zn-O target, the atomic ratio of each element to the total amount of In, Zn, and Ti on a glass substrate is respectively 58 atomic% of In, 38 atomic% of Zn, and Ti: 4
- An In-Ti-Zn-O-based oxide semiconductor thin film having an atomic percentage was manufactured.
- the transfer characteristics of the thin film transistor having the active layer formed of the manufactured oxide semiconductor thin film were evaluated. As a result, the mobility is 15 cm 2 / Vs, the threshold voltage (Vth) is 0.7 V, and the PBTS (Vth) is +1.8 V, The NBTS (Vth) was -1.2V.
- the carrier density was 2.5E + 17 (2.5 ⁇ 10 17 ) / cm 3 , and the etching rate was 2.8 nm / sec.
- Example 3 The atomic ratio of each element to the total amount of In, Zn and Ti was 85 atomic% In, 7 atomic% Zn, and 8 Ti on a glass substrate, using an In-Ti-Zn-O target.
- An In-Ti-Zn-O-based oxide semiconductor thin film having an atomic percentage was manufactured.
- the mobility is 50 cm 2 / Vs
- the threshold voltage (Vth) is -5.2 V
- the PBTS (Vth) is +0.5 V
- NBTS (Vth) was -5.0V.
- the carrier density was 4.1E + 19 (4.1 ⁇ 10 19 ) / cm 3 and the etching rate was less than 0.1 nm / sec (measurement limit).
- Example 4 Using an In-Ti-Zn-O target, the atomic ratio of each element to the total amount of In, Zn, and Ti was 38 atomic% In, 58 atomic% Zn, and Ti: 4 on the total weight of the glass substrate.
- An In-Ti-Zn-O-based oxide semiconductor thin film having an atomic percentage was manufactured.
- the mobility is 6 cm 2 / Vs
- the threshold voltage (Vth) is 0.3 V
- the PBTS (Vth) is +3.2 V
- the NBTS (Vth) was -0.9V.
- the carrier density was 2.5E + 16 (2.5 ⁇ 10 16 ) / cm 3 and the etching rate was 13.0 nm / sec.
- Example 5 The atomic ratio of each element in the total amount of In, Zn, and Ti on a glass substrate is In atomic ratio: 17 atomic%, Zn atomic ratio: 75 atomic%, Ti: 8 on a glass substrate using an In-Ti-Zn-O target.
- An In-Ti-Zn-O-based oxide semiconductor thin film having an atomic percentage was manufactured.
- the mobility is 5 cm 2 / Vs
- the threshold voltage (Vth) is 2.8 V
- the PBTS (Vth) is +4.5 V
- the NBTS (Vth) was -0.5V.
- the carrier density was 4.0E + 14 (4.0 ⁇ 10 14 ) / cm 3
- the etching rate was 15.0 nm / sec.
- Example 6 The atomic ratio of each element in the total amount of In, Zn, Ti, and Sn on a glass substrate is In: 35 at%, Zn: 60 at%, using an In-Sn-Ti-Zn-O target.
- the transfer characteristics of the thin film transistor having the active layer formed of the manufactured oxide semiconductor thin film were evaluated. As a result, the mobility was 10 cm 2 / Vs, the threshold voltage (Vth) was 1.8 V, and the PBTS (Vth) was +1.8 V, The NBTS (Vth) was -0.4V.
- the carrier density was 3.5E + 17 (3.5 ⁇ 10 17 ) / cm 3
- the etching rate was 10.0 nm / sec.
- Example 7 The atomic ratio of each element in the total amount of In, Zn, Ti, and Sn on a glass substrate is In: 58 atomic%, Zn: 37 atomic%, using an In-Sn-Ti-Zn-O target.
- the transfer characteristics of the thin film transistor having the active layer formed of the manufactured oxide semiconductor thin film were evaluated. As a result, the mobility is 17 cm 2 / Vs, the threshold voltage (Vth) is 0.7 V, and the PBTS (Vth) is +0.9 V, The NBTS (Vth) was -1.2V.
- the carrier density was 5.6E + 17 (5.6 ⁇ 10 17 ) / cm 3
- the etching rate was 2.6 nm / sec.
- Example 8 The atomic ratio of each element in the total amount of In, Zn, Ti, and Sn on a glass substrate is In: 46 at%, Zn: 48 at%, using an In-Sn-Ti-Zn-O target.
- the mobility is 20 cm 2 / Vs
- the threshold voltage (Vth) is 0.9 V
- the PBTS (Vth) is +1.5 V
- the NBTS (Vth) was -0.6V.
- the carrier density was 4.2E + 17 (4.2 ⁇ 10 17 ) / cm 3
- the etching rate was 3.0 nm / sec.
- the atomic ratio of each element in the total amount of In, Zn, Ti, and Sn on a glass substrate is In: 56 at%, Zn: 39 at%, using an In-Sn-Ti-Zn-O target.
- An In—Sn—Ti—Zn—O-based oxide semiconductor thin film having a Ti: 3 atomic%, and an Sn: 2 atomic% was prepared.
- the mobility is 21 cm 2 / Vs
- the threshold voltage (Vth) is 0.8 V
- the PBTS (Vth) is +1.2 V
- the NBTS (Vth) was -1.0V.
- the carrier density was 3.5E + 17 (3.5 ⁇ 10 17 ) / cm 3
- the etching rate was 2.2 nm / sec.
- the atomic ratio of each element in the total amount of In, Zn, Ti, and Sn on a glass substrate is In: 57 at%, Zn: 35 at%, using an In-Sn-Ti-Zn-O target.
- An In—Sn—Ti—Zn—O-based oxide semiconductor thin film having a Ti: 3 atomic percent and a Sn: 5 atomic percent was prepared.
- the mobility is 23 cm 2 / Vs
- the threshold voltage (Vth) is 0.6 V
- the PBTS (Vth) is +1.0 V
- the NBTS (Vth) was -0.7V.
- the carrier density was 5.6E + 17 (5.6 ⁇ 10 17 ) / cm 3
- the etching rate was 1.0 nm / sec.
- the atomic ratio of each element to the total amount of In, Zn, Ti, and Sn on a glass substrate is In: 53 at%, Zn: 30 at%, using an In-Sn-Ti-Zn-O target.
- An In—Sn—Ti—Zn—O-based oxide semiconductor thin film containing 3 atomic percent Ti and 14 atomic percent Sn was prepared.
- the transfer characteristics of the thin film transistor having the active layer formed of the manufactured oxide semiconductor thin film were evaluated. As a result, the mobility was 26 cm 2 / Vs, the threshold voltage (Vth) was 0.3 V, and the PBTS (Vth) was +0.7 V, The NBTS (Vth) was -0.2V.
- the carrier density was 2.5E + 18 (2.5 ⁇ 10 18 ) / cm 3 , and the etching rate was less than 0.1 nm / sec (measurement limit).
- the atomic ratio of each element in the total amount of In, Zn, Ti, and Sn on a glass substrate is In: 52 at%, Zn: 28 at%, using an In-Sn-Ti-Zn-O target.
- An In—Sn—Ti—Zn—O-based oxide semiconductor thin film having 3 atomic% of Ti and 17 atomic% of Sn was prepared.
- the transfer characteristics of the thin film transistor having the active layer formed of the manufactured oxide semiconductor thin film were evaluated. The mobility was 27 cm 2 / Vs, the threshold voltage (Vth) was 0.2 V, and the PBTS (Vth) was +0.6 V, The NBTS (Vth) was -1.5V.
- the carrier density was 4.1E + 18 (4.1 ⁇ 10 18 ) / cm 3 , and the etching rate was less than 0.1 nm / sec (measurement limit).
- the atomic ratio of each element in the total amount of In, Zn, Ti, and Sn on a glass substrate is In: 51 at%, Zn: 25 at%, using an In-Sn-Ti-Zn-O target.
- An In—Sn—Ti—Zn—O-based oxide semiconductor thin film of 3 atomic percent Ti and 21 atomic percent Sn was prepared.
- the transfer characteristics of the thin film transistor having the active layer formed of the manufactured oxide semiconductor thin film were evaluated, and the mobility was 28 cm 2 / Vs, the threshold voltage (Vth) was 0.1 V, and the PBTS (Vth) was +0.6 V, The NBTS (Vth) was -2.0V.
- the carrier density was 4.0E + 18 (4.0 ⁇ 10 18 ) / cm 3 , and the etching rate was less than 0.1 nm / sec (measurement limit).
- Example 14 The atomic ratio of each element in the total amount of In, Zn, Ti, and Sn on a glass substrate is In: 51 at%, Zn: 18 at%, using an In-Sn-Ti-Zn-O target.
- the mobility is 20 cm 2 / Vs
- the threshold voltage (Vth) is 0.7 V
- the PBTS (Vth) is +1.1 V
- the NBTS (Vth) was -0.6V.
- the carrier density was 6.0E + 17 (6.0 ⁇ 10 17 ) / cm 3
- the etching rate was less than 0.1 nm / sec (measurement limit).
- Example 15 The atomic ratio of each element in the total amount of In, Zn, Ti, and Sn on a glass substrate is In: 52 at%, Zn: 5 at%, using an In-Sn-Ti-Zn-O target.
- the mobility is 29 cm 2 / Vs
- the threshold voltage (Vth) is -3.6 V
- the PBTS (Vth) is +0.5 V
- NBTS (Vth) was -3.4V.
- the carrier density was 8.5E + 18 (8.5 ⁇ 10 18 ) / cm 3
- the etching rate was less than 0.1 nm / sec (measurement limit).
- Example 16 The atomic ratio of each element in the total amount of In, Zn, Ti, and Sn on a glass substrate is In: 50 atomic%, Zn: 4 atomic%, using an In-Sn-Ti-Zn-O target.
- the mobility is 32 cm 2 / Vs
- the threshold voltage (Vth) is -4.6 V
- the PBTS (Vth) is +0.2 V
- NBTS (Vth) was -4.8V.
- the carrier density was 6.0E + 19 (6.0 ⁇ 10 19 ) / cm 3
- the etching rate was less than 0.1 nm / sec (measurement limit).
- Example 17 The atomic ratio of each element in the total amount of In, Zn, Ti, and Sn on a glass substrate is In: 63 at%, Zn: 19 at%, using an In-Sn-Ti-Zn-O target.
- the mobility is 27 cm 2 / Vs
- the threshold voltage (Vth) is -0.8 V
- the PBTS (Vth) is +0.6 V
- NBTS (Vth) was -2.2V.
- the carrier density was 5.2 E + 18 (5.2 ⁇ 10 18 ) / cm 3
- the etching rate was less than 0.1 nm / sec (measurement limit).
- Example 18 The atomic ratio of each element in the total amount of In, Zn, Ti, and Sn on a glass substrate is In: 54 at%, Zn: 32 at%, using an In-Sn-Ti-Zn-O target.
- An In—Sn—Ti—Zn—O-based oxide semiconductor thin film was prepared, in which Ti: 1 atomic% and Sn: 13 atomic%.
- the mobility is 25 cm 2 / Vs
- the threshold voltage (Vth) is -4.1 V
- the PBTS (Vth) is +1.1 V
- NBTS (Vth) was -4.2V.
- the carrier density was 2.8E + 19 (2.8 ⁇ 10 19 ) / cm 3
- the etching rate was less than 0.1 nm / sec (measurement limit).
- the atomic ratio of each element to the total amount of In, Zn, Ti, and Sn on a glass substrate is In: 53 at%, Zn: 30 at%, using an In-Sn-Ti-Zn-O target.
- An In—Sn—Ti—Zn—O-based oxide semiconductor thin film having 10 atomic percent Ti and 7 atomic percent Sn was prepared.
- the mobility is 11 cm 2 / Vs
- the threshold voltage (Vth) is 2.6 V
- the PBTS (Vth) is +3.4 V
- the NBTS (Vth) was -0.6V.
- the carrier density was 7.0E + 16 (7.0 ⁇ 10 16 ) / cm 3
- the etching rate was less than 0.1 nm / sec (measurement limit).
- Example 20 The atomic ratio of each element in the total amount of In, Zn, Ti, and Sn on a glass substrate is In: 40 at%, Zn: 38 at%, using an In-Sn-Ti-Zn-O target.
- the mobility is 8 cm 2 / Vs
- the threshold voltage (Vth) is 2.8 V
- the PBTS (Vth) is +3.1 V
- the NBTS (Vth) was -0.7V.
- the carrier density was 3.8E + 15 (3.8 ⁇ 10 16 ) / cm 3
- the etching rate was less than 0.1 nm / sec (measurement limit).
- Example 21 Using an In-Ga-Zn-O target, the atomic ratio of each element to the total amount of In, Zn, and Ga was 33 atomic% In, 33 atomic% Zn, and 33 Ga, respectively, on a glass substrate.
- An In-Ga-Zn-O-based oxide semiconductor thin film having an atomic percentage was manufactured.
- the mobility is 8 cm 2 / Vs
- the threshold voltage (Vth) is 3.6 V
- the PBTS (Vth) is +6.3 V
- the NBTS (Vth) was 0.2V.
- the carrier density was 5.7E + 14 (5.7 ⁇ 10 14 ) / cm 3
- the etching rate was 5.3 nm / sec.
- Atomic ratio 1 (In + Sn) / (In + Zn + Ti + Sn)
- Atomic ratio 2 Sn / (In + Sn)
- Atomic ratio 3 Sn / (In + Zn + Ti + Sn)
- Atomic ratio 4 Ti / (In + Zn + Ti + Sn)
- the mobility tends to increase as the content of In increases, and the threshold voltage tends to shift to the negative side as the content of In and Sn increases.
- the threshold voltage is high, which degrades the PBTS but tends to improve the NBTS.
- the threshold voltage is lowered, which improves the PBTS but tends to degrade the NBTS.
- the In-Ti-Zn-O-based oxide semiconductor thin film according to Samples 1 to 5 has a low threshold voltage and a high mobility. In the case of threshold voltage, the threshold voltage was low. The mobility was 10 cm 2 / Vs or more in samples 1 to 3, whereas in samples 4 and 5, the result was lower than the mobility of sample 21 (In-Ga-Zn-O system).
- the mobility is higher and the threshold voltage is lower than Sample 21 (In-Ga-Zn-O-based).
- the PBTS / NBTS characteristics were also good.
- the In-Sn-Ti-Zn-O-based oxide semiconductor thin film according to sample 20 having a relatively high Ti content the mobility is lower and the PBTS is significantly deteriorated compared to samples 6 to 19.
- the atomic ratio 1 is 0.36 to 0.92
- the atomic ratio 2 is 0.02 to 0.46
- the atomic ratio 3 is 0.01 to 0.42
- the atomic ratio 4 is 0.01
- the In-Sn-Ti-Zn-O-based oxide semiconductor thin film having a value of 0.10 or less
- a transistor characteristic having a mobility of 10 cm 2 / Vs or more higher than that of the In-Ga-Zn-O-based is obtained.
- atomic ratio 1 is 0.48 to 0.72
- atomic ratio 2 is 0.03 to 0.29
- atomic ratio 3 is 0.02 to 0.21
- atomic ratio 4 is 0.03.
- the In-Sn-Ti-Zn-O-based oxide semiconductor thin film according to Samples 8 to 14 having a value of 0.10 or less, mobility of 20 cm 2 / Vs or more, PBTS characteristic of 0 V or more and 2 V or less, It is possible to obtain highly reliable transistor characteristics with less variation in threshold voltage, such as the NBTS characteristics of ⁇ 2 V or more and 0 V or less. It was confirmed that the In—Sn—Ti—Zn—O-based oxide semiconductor thin films according to these samples 8 to 14 were amorphous even after annealing.
- a thin film transistor including an oxide semiconductor film having an amorphous structure as an active layer has an advantage that variation in mobility is small and enlargement can be easily performed. Whether or not the active layer is amorphous can be evaluated by an X-ray diffraction pattern, an electron beam diffraction pattern or the like.
- the etching rate can be suppressed to 3 nm / sec or less.
- a thin film transistor can be manufactured without the need for an etching stopper layer for protecting the active layer formed of the oxide semiconductor thin film from an etching solution for forming a source / drain electrode.
- a so-called bottom gate type (inverted staggered type) transistor has been described as an example, but the present invention can be applied to a top gate type (stagger type) thin film transistor.
- the thin film transistor described above can be used as a TFT for an active matrix display panel such as a liquid crystal display or an organic EL display.
- the transistor can be used as a transistor element of various semiconductor devices or electronic devices.
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Abstract
Description
(In+Sn)/(In+Zn+Ti+Sn)の原子比が0.36以上0.92以下、
Sn/(In+Sn)の原子比が0.02以上0.46以下、
Sn/(In+Zn+Ti+Sn)の原子比が0.01以上0.42以下、
Ti/(In+Zn+Ti+Sn)の原子比が0.01以上0.10以下である。
(In+Sn)/(In+Zn+Ti+Sn)の原子比が0.48以上0.72以下、
Sn/(In+Sn)の原子比が0.03以上0.29以下、
Sn/(In+Zn+Ti+Sn)の原子比が0.02以上0.21以下、
Ti/(In+Zn+Ti+Sn)の原子比が0.03以上0.10以下であってもよい。
これにより、10cm2/Vs以上の移動度を有する薄膜トランジスタを構成することができる。
また、60℃の温度下で、+30Vのゲート電圧を60分間印加し続ける試験の実施前後における閾値電圧の変化量は、0V以上2V以下である薄膜トランジスタを得ることができる。
あるいは、60℃の温度下で、-30Vのゲート電圧を60分間印加し続ける試験の実施前後における閾値電圧の変化量は、-2V以上0V以下である薄膜トランジスタを得ることができる。
ゲート電極の上にゲート絶縁膜を形成し、
前記ゲート絶縁膜の上に前記活性層をスパッタリング法で形成し、
前記活性層を下地膜とする金属層を形成し、
前記金属層をウェットエッチング法でパターニングすることでソース電極及びドレイン電極を形成する。
[薄膜トランジスタ]
本実施形態の薄膜トランジスタ100は、ゲート電極11と、ゲート絶縁膜12と、活性層13と、ソース電極14Sと、ドレイン電極14Dとを有する。
続いて、活性層13を構成する酸化物半導体薄膜について説明する。
(In+Sn)/(In+Zn+Ti+Sn)の原子比(In、Zn、Ti及びSnの総和に対するIn及びSnの和の原子比)は、0.36以上0.92以下である。
Sn/(In+Sn)の原子比(In及びSnの和に対するSnの原子比)は、0.02以上0.46以下である。
Sn/(In+Zn+Ti+Sn)の原子比(In、Zn、Ti及びSnの総和に対するSnの原子比)は、0.01以上0.42以下である。
Ti/(In+Zn+Ti+Sn)の原子比(In、Zn、Ti及びSnの総和に対するTiの原子比)は、0.01以上0.10以下である。
なお、組成の上限値及び下限値は、少数第3位を四捨五入した値である(以下同様)。
これにより、20cm2/Vs以上の移動度を有するトランジスタ特性を得ることができる。
また、60℃の温度下で、-30Vのゲート電圧を60分間印加し続ける試験の実施前後における閾値電圧の変化量は、-2V以上0V以下であった。
図2に示すように、In-Sn-Ti-Zn-SnO膜を活性層として用いた薄膜トランジスタの伝達特性を評価すると、In-Ti-Zn-O系酸化物半導体薄膜及びIn-Ga-Zn-O系酸化物薄膜のそれと比較して、移動度及びオン/オフ電流比がいずれも高いことが確認される。
ここでは、ゲート電圧(Vg)が-15Vのときのドレイン電流(Id)をオフ電流、ゲート電圧(Vg)が+20Vのときのドレイン電流(Id)をオン電流とし、得られたオン電流のオフ電流に対する比をオン/オフ電流比とした。
本発明者らは、In-Ti-Zn-O系酸化物薄膜、In-Sn-Ti-Zn-O系酸化物薄膜、及び、In-Ga-Zn-O系酸化物半導体薄膜をスパッタ法でそれぞれ形成し、これらの膜を活性層として図1に示した構造の薄膜トランジスタを作製して、各トランジスタの伝達特性(移動度、閾値電圧、PBTS、NBTS)を評価した。さらに、上記酸化物半導体薄膜の膜特性(キャリア密度、ウェットエッチングレート)をそれぞれ評価した。
PBTS(ΔVth)は、60℃の温度下で、+30Vのゲート電圧を60分間印加した後の閾値電圧の変化量とした。
NBTS(ΔVth)は、60℃の温度下で、-30Vのゲート電圧を60分間印加した後の閾値電圧の変化量とした。
エッチングレートの測定には、成膜直後の酸化物半導体薄膜を40℃に管理した薬液(りんしょう酢酸系エッチング液)に浸漬するDip法を採用した。
In-Ti-Zn-Oターゲットを用いて、ガラス基板上に、In、Zn及びTiの合計量に占める各元素の原子比がそれぞれ、In:48原子%、Zn:48原子%、Ti:4原子%であるIn-Ti-Zn-O系酸化物半導体薄膜を作製した。
作製した酸化物半導体薄膜で構成された活性層を有する薄膜トランジスタの伝達特性を評価した結果、移動度は12cm2/Vs、閾値電圧(Vth)は0.4V、PBTS(Vth)は+3.2V、NBTS(Vth)は-0.1Vであった。
上記酸化物半導体薄膜の膜特性を評価した結果、キャリア密度は5.1E+16(5.1×1016)/cm3、エッチングレートは4.7nm/secであった。
In-Ti-Zn-Oターゲットを用いて、ガラス基板上に、In、Zn及びTiの合計量に占める各元素の原子比がそれぞれ、In:58原子%、Zn:38原子%、Ti:4原子%であるIn-Ti-Zn-O系酸化物半導体薄膜を作製した。
作製した酸化物半導体薄膜で構成された活性層を有する薄膜トランジスタの伝達特性を評価した結果、移動度は15cm2/Vs、閾値電圧(Vth)は0.7V、PBTS(Vth)は+1.8V、NBTS(Vth)は-1.2Vであった。
上記酸化物半導体薄膜の膜特性を評価した結果、キャリア密度は2.5E+17(2.5×1017)/cm3、エッチングレートは2.8nm/secであった。
In-Ti-Zn-Oターゲットを用いて、ガラス基板上に、In、Zn及びTiの合計量に占める各元素の原子比がそれぞれ、In:85原子%、Zn:7原子%、Ti:8原子%であるIn-Ti-Zn-O系酸化物半導体薄膜を作製した。
作製した酸化物半導体薄膜で構成された活性層を有する薄膜トランジスタの伝達特性を評価した結果、移動度は50cm2/Vs、閾値電圧(Vth)は-5.2V、PBTS(Vth)は+0.5V、NBTS(Vth)は-5.0Vであった。
上記酸化物半導体薄膜の膜特性を評価した結果、キャリア密度は4.1E+19(4.1×1019)/cm3、エッチングレートは0.1nm/sec未満(測定限界)であった。
In-Ti-Zn-Oターゲットを用いて、ガラス基板上に、In、Zn及びTiの合計量に占める各元素の原子比がそれぞれ、In:38原子%、Zn:58原子%、Ti:4原子%であるIn-Ti-Zn-O系酸化物半導体薄膜を作製した。
作製した酸化物半導体薄膜で構成された活性層を有する薄膜トランジスタの伝達特性を評価した結果、移動度は6cm2/Vs、閾値電圧(Vth)は0.3V、PBTS(Vth)は+3.2V、NBTS(Vth)は-0.9Vであった。
上記酸化物半導体薄膜の膜特性を評価した結果、キャリア密度は2.5E+16(2.5×1016)/cm3、エッチングレートは13.0nm/secであった。
In-Ti-Zn-Oターゲットを用いて、ガラス基板上に、In、Zn及びTiの合計量に占める各元素の原子比がそれぞれ、In:17原子%、Zn:75原子%、Ti:8原子%であるIn-Ti-Zn-O系酸化物半導体薄膜を作製した。
作製した酸化物半導体薄膜で構成された活性層を有する薄膜トランジスタの伝達特性を評価した結果、移動度は5cm2/Vs、閾値電圧(Vth)は2.8V、PBTS(Vth)は+4.5V、NBTS(Vth)は-0.5Vであった。
上記酸化物半導体薄膜の膜特性を評価した結果、キャリア密度は4.0E+14(4.0×1014)/cm3、エッチングレートは15.0nm/secであった。
In-Sn-Ti-Zn-Oターゲットを用いて、ガラス基板上に、In、Zn及びTi、Snの合計量に占める各元素の原子比がそれぞれ、In:35原子%、Zn:60原子%、Ti:4原子%、Sn:1原子%であるIn-Sn-Ti-Zn-O系酸化物半導体薄膜を作製した。
作製した酸化物半導体薄膜で構成された活性層を有する薄膜トランジスタの伝達特性を評価した結果、移動度は10cm2/Vs、閾値電圧(Vth)は1.8V、PBTS(Vth)は+1.8V、NBTS(Vth)は-0.4Vであった。
上記酸化物半導体薄膜の膜特性を評価した結果、キャリア密度は3.5E+17(3.5×1017)/cm3、エッチングレートは10.0nm/secであった。
In-Sn-Ti-Zn-Oターゲットを用いて、ガラス基板上に、In、Zn及びTi、Snの合計量に占める各元素の原子比がそれぞれ、In:58原子%、Zn:37原子%、Ti:4原子%、Sn:1原子%であるIn-Sn-Ti-Zn-O系酸化物半導体薄膜を作製した。
作製した酸化物半導体薄膜で構成された活性層を有する薄膜トランジスタの伝達特性を評価した結果、移動度は17cm2/Vs、閾値電圧(Vth)は0.7V、PBTS(Vth)は+0.9V、NBTS(Vth)は-1.2Vであった。
上記酸化物半導体薄膜の膜特性を評価した結果、キャリア密度は5.6E+17(5.6×1017)/cm3、エッチングレートは2.6nm/secであった。
In-Sn-Ti-Zn-Oターゲットを用いて、ガラス基板上に、In、Zn及びTi、Snの合計量に占める各元素の原子比がそれぞれ、In:46原子%、Zn:48原子%、Ti:4原子%、Sn:2原子%であるIn-Sn-Ti-Zn-O系酸化物半導体薄膜を作製した。
作製した酸化物半導体薄膜で構成された活性層を有する薄膜トランジスタの伝達特性を評価した結果、移動度は20cm2/Vs、閾値電圧(Vth)は0.9V、PBTS(Vth)は+1.5V、NBTS(Vth)は-0.6Vであった。
上記酸化物半導体薄膜の膜特性を評価した結果、キャリア密度は4.2E+17(4.2×1017)/cm3、エッチングレートは3.0nm/secであった。
In-Sn-Ti-Zn-Oターゲットを用いて、ガラス基板上に、In、Zn及びTi、Snの合計量に占める各元素の原子比がそれぞれ、In:56原子%、Zn:39原子%、Ti:3原子%、Sn:2原子%であるIn-Sn-Ti-Zn-O系酸化物半導体薄膜を作製した。
作製した酸化物半導体薄膜で構成された活性層を有する薄膜トランジスタの伝達特性を評価した結果、移動度は21cm2/Vs、閾値電圧(Vth)は0.8V、PBTS(Vth)は+1.2V、NBTS(Vth)は-1.0Vであった。
上記酸化物半導体薄膜の膜特性を評価した結果、キャリア密度は3.5E+17(3.5×1017)/cm3、エッチングレートは2.2nm/secであった。
In-Sn-Ti-Zn-Oターゲットを用いて、ガラス基板上に、In、Zn及びTi、Snの合計量に占める各元素の原子比がそれぞれ、In:57原子%、Zn:35原子%、Ti:3原子%、Sn:5原子%であるIn-Sn-Ti-Zn-O系酸化物半導体薄膜を作製した。
作製した酸化物半導体薄膜で構成された活性層を有する薄膜トランジスタの伝達特性を評価した結果、移動度は23cm2/Vs、閾値電圧(Vth)は0.6V、PBTS(Vth)は+1.0V、NBTS(Vth)は-0.7Vであった。
上記酸化物半導体薄膜の膜特性を評価した結果、キャリア密度は5.6E+17(5.6×1017)/cm3、エッチングレートは1.0nm/secであった。
In-Sn-Ti-Zn-Oターゲットを用いて、ガラス基板上に、In、Zn及びTi、Snの合計量に占める各元素の原子比がそれぞれ、In:53原子%、Zn:30原子%、Ti:3原子%、Sn:14原子%であるIn-Sn-Ti-Zn-O系酸化物半導体薄膜を作製した。
作製した酸化物半導体薄膜で構成された活性層を有する薄膜トランジスタの伝達特性を評価した結果、移動度は26cm2/Vs、閾値電圧(Vth)は0.3V、PBTS(Vth)は+0.7V、NBTS(Vth)は-0.2Vであった。
上記酸化物半導体薄膜の膜特性を評価した結果、キャリア密度は2.5E+18(2.5×1018)/cm3、エッチングレートは0.1nm/sec未満(測定限界)であった。
In-Sn-Ti-Zn-Oターゲットを用いて、ガラス基板上に、In、Zn及びTi、Snの合計量に占める各元素の原子比がそれぞれ、In:52原子%、Zn:28原子%、Ti:3原子%、Sn:17原子%であるIn-Sn-Ti-Zn-O系酸化物半導体薄膜を作製した。
作製した酸化物半導体薄膜で構成された活性層を有する薄膜トランジスタの伝達特性を評価した結果、移動度は27cm2/Vs、閾値電圧(Vth)は0.2V、PBTS(Vth)は+0.6V、NBTS(Vth)は-1.5Vであった。
上記酸化物半導体薄膜の膜特性を評価した結果、キャリア密度は4.1E+18(4.1×1018)/cm3、エッチングレートは0.1nm/sec未満(測定限界)であった。
In-Sn-Ti-Zn-Oターゲットを用いて、ガラス基板上に、In、Zn及びTi、Snの合計量に占める各元素の原子比がそれぞれ、In:51原子%、Zn:25原子%、Ti:3原子%、Sn:21原子%であるIn-Sn-Ti-Zn-O系酸化物半導体薄膜を作製した。
作製した酸化物半導体薄膜で構成された活性層を有する薄膜トランジスタの伝達特性を評価した結果、移動度は28cm2/Vs、閾値電圧(Vth)は0.1V、PBTS(Vth)は+0.6V、NBTS(Vth)は-2.0Vであった。
上記酸化物半導体薄膜の膜特性を評価した結果、キャリア密度は4.0E+18(4.0×1018)/cm3、エッチングレートは0.1nm/sec未満(測定限界)であった。
In-Sn-Ti-Zn-Oターゲットを用いて、ガラス基板上に、In、Zn及びTi、Snの合計量に占める各元素の原子比がそれぞれ、In:51原子%、Zn:18原子%、Ti:10原子%、Sn:21原子%であるIn-Sn-Ti-Zn-O系酸化物半導体薄膜を作製した。
作製した酸化物半導体薄膜で構成された活性層を有する薄膜トランジスタの伝達特性を評価した結果、移動度は20cm2/Vs、閾値電圧(Vth)は0.7V、PBTS(Vth)は+1.1V、NBTS(Vth)は-0.6Vであった。
上記酸化物半導体薄膜の膜特性を評価した結果、キャリア密度は6.0E+17(6.0×1017)/cm3、エッチングレートは0.1nm/sec未満(測定限界)であった。
In-Sn-Ti-Zn-Oターゲットを用いて、ガラス基板上に、In、Zn及びTi、Snの合計量に占める各元素の原子比がそれぞれ、In:52原子%、Zn:5原子%、Ti:3原子%、Sn:40原子%であるIn-Sn-Ti-Zn-O系酸化物半導体薄膜を作製した。
作製した酸化物半導体薄膜で構成された活性層を有する薄膜トランジスタの伝達特性を評価した結果、移動度は29cm2/Vs、閾値電圧(Vth)は-3.6V、PBTS(Vth)は+0.5V、NBTS(Vth)は-3.4Vであった。
上記酸化物半導体薄膜の膜特性を評価した結果、キャリア密度は8.5E+18(8.5×1018)/cm3、エッチングレートは0.1nm/sec未満(測定限界)であった。
In-Sn-Ti-Zn-Oターゲットを用いて、ガラス基板上に、In、Zn及びTi、Snの合計量に占める各元素の原子比がそれぞれ、In:50原子%、Zn:4原子%、Ti:4原子%、Sn:42原子%であるIn-Sn-Ti-Zn-O系酸化物半導体薄膜を作製した。
作製した酸化物半導体薄膜で構成された活性層を有する薄膜トランジスタの伝達特性を評価した結果、移動度は32cm2/Vs、閾値電圧(Vth)は-4.6V、PBTS(Vth)は+0.2V、NBTS(Vth)は、-4.8Vであった。
上記酸化物半導体薄膜の膜特性を評価した結果、キャリア密度は6.0E+19(6.0×1019)/cm3、エッチングレートは0.1nm/sec未満(測定限界)であった。
In-Sn-Ti-Zn-Oターゲットを用いて、ガラス基板上に、In、Zn及びTi、Snの合計量に占める各元素の原子比がそれぞれ、In:63原子%、Zn:19原子%、Ti:4原子%、Sn:14原子%であるIn-Sn-Ti-Zn-O系酸化物半導体薄膜を作製した。
作製した酸化物半導体薄膜で構成された活性層を有する薄膜トランジスタの伝達特性を評価した結果、移動度は27cm2/Vs、閾値電圧(Vth)は-0.8V、PBTS(Vth)は+0.6V、NBTS(Vth)は-2.2Vであった。
上記酸化物半導体薄膜の膜特性を評価した結果、キャリア密度は5.2E+18(5.2×1018)/cm3、エッチングレートは0.1nm/sec未満(測定限界)であった。
In-Sn-Ti-Zn-Oターゲットを用いて、ガラス基板上に、In、Zn及びTi、Snの合計量に占める各元素の原子比がそれぞれ、In:54原子%、Zn:32原子%、Ti:1原子%、Sn:13原子%であるIn-Sn-Ti-Zn-O系酸化物半導体薄膜を作製した。
作製した酸化物半導体薄膜で構成された活性層を有する薄膜トランジスタの伝達特性を評価した結果、移動度は25cm2/Vs、閾値電圧(Vth)は-4.1V、PBTS(Vth)は+1.1V、NBTS(Vth)は-4.2Vであった。
上記酸化物半導体薄膜の膜特性を評価した結果、キャリア密度は2.8E+19(2.8×1019)/cm3、エッチングレートは0.1nm/sec未満(測定限界)であった。
In-Sn-Ti-Zn-Oターゲットを用いて、ガラス基板上に、In、Zn及びTi、Snの合計量に占める各元素の原子比がそれぞれ、In:53原子%、Zn:30原子%、Ti:10原子%、Sn:7原子%であるIn-Sn-Ti-Zn-O系酸化物半導体薄膜を作製した。
作製した酸化物半導体薄膜で構成された活性層を有する薄膜トランジスタの伝達特性を評価した結果、移動度は11cm2/Vs、閾値電圧(Vth)は2.6V、PBTS(Vth)は+3.4V、NBTS(Vth)は-0.6Vであった。
上記酸化物半導体薄膜の膜特性を評価した結果、キャリア密度は7.0E+16(7.0×1016)/cm3、エッチングレートは0.1nm/sec未満(測定限界)であった。
In-Sn-Ti-Zn-Oターゲットを用いて、ガラス基板上に、In、Zn及びTi、Snの合計量に占める各元素の原子比がそれぞれ、In:40原子%、Zn:38原子%、Ti:12原子%、Sn:10原子%であるIn-Sn-Ti-Zn-O系酸化物半導体薄膜を作製した。
作製した酸化物半導体薄膜で構成された活性層を有する薄膜トランジスタの伝達特性を評価した結果、移動度は8cm2/Vs、閾値電圧(Vth)は2.8V、PBTS(Vth)は+3.1V、NBTS(Vth)は-0.7Vであった。
上記酸化物半導体薄膜の膜特性を評価した結果、キャリア密度は3.8E+15(3.8×1016)/cm3、エッチングレートは0.1nm/sec未満(測定限界)であった。
In-Ga-Zn-Oターゲットを用いて、ガラス基板上に、In、Zn及びGaの合計量に占める各元素の原子比がそれぞれ、In:33原子%、Zn:33原子%、Ga:33原子%であるIn-Ga-Zn-O系酸化物半導体薄膜を作製した。
作製した酸化物半導体薄膜で構成された活性層を有する薄膜トランジスタの伝達特性を評価した結果、移動度は8cm2/Vs、閾値電圧(Vth)は3.6V、PBTS(Vth)は+6.3V、NBTS(Vth)は0.2Vであった。
上記酸化物半導体薄膜の膜特性を評価した結果、キャリア密度は5.7E+14(5.7×1014)/cm3、エッチングレートは5.3nm/secであった。
原子比1:(In+Sn)/(In+Zn+Ti+Sn)、
原子比2:Sn/(In+Sn)、
原子比3:Sn/(In+Zn+Ti+Sn)、
原子比4:Ti/(In+Zn+Ti+Sn)
移動度に関しては、サンプル1~3では10cm2/Vs以上であったのに対して、サンプル4,5では、サンプル21(In-Ga-Zn-O系)の移動度よりも低い結果となった。
なお、Ti含有量が比較的高いサンプル20に係るIn-Sn-Ti-Zn-O系酸化物半導体薄膜によれば、サンプル6~19と比較して、移動度が低く、PBTSの劣化が大きかった。
これらサンプル8~14に係るIn-Sn-Ti-Zn-O系酸化物半導体薄膜は、アニール後もアモルファスであることが確認された。酸化物半導体膜がアモルファス構造を有することで、結晶サイズや結晶粒界の制御が不要となる。このため、アモルファス構造の酸化物半導体膜を活性層として備える薄膜トランジスタにおいては、移動度のばらつきが少なく、大面積化が容易になるという利点がある。
活性層がアモルファスか否かは、X線回折パターンや電子線回折パターン等によって評価することができる。
11…ゲート電極
12…ゲート絶縁膜
13…活性層
14S…ソース電極
14D…ドレイン電極
15…保護膜
Claims (11)
- In、Zn、Ti及びSnを含む酸化物半導体で構成され、
(In+Sn)/(In+Zn+Ti+Sn)の原子比が0.36以上0.92以下、
Sn/(In+Sn)の原子比が0.02以上0.46以下、
Sn/(In+Zn+Ti+Sn)の原子比が0.01以上0.42以下、
Ti/(In+Zn+Ti+Sn)の原子比が0.01以上0.10以下である
酸化物半導体薄膜。 - 請求項1に記載の酸化物半導体薄膜であって、
(In+Sn)/(In+Zn+Ti+Sn)の原子比が0.48以上0.72以下、
Sn/(In+Sn)の原子比が0.03以上0.29以下、
Sn/(In+Zn+Ti+Sn)の原子比が0.02以上0.21以下、
Ti/(In+Zn+Ti+Sn)の原子比が0.03以上0.10以下である
酸化物半導体薄膜。 - 請求項1に記載の酸化物半導体薄膜であって、
移動度が10cm2/Vs以上である
酸化物半導体薄膜。 - 請求項2に記載の酸化物半導体薄膜であって、
移動度が20cm2/Vs以上である
酸化物半導体薄膜。 - 請求項1~4のいずれか1つに記載の酸化物半導体薄膜であって、
前記酸化物半導体薄膜は、酸性エッチング液に対して耐性を有する
酸化物半導体薄膜。 - 請求項1に記載の酸化物半導体薄膜からなる活性層を具備し、
移動度が10cm2/Vs以上である
薄膜トランジスタ。 - 請求項2に記載の酸化物半導体薄膜からなる活性層を具備し、
移動度が20cm2/Vs以上である
薄膜トランジスタ。 - 請求項7に記載の薄膜トランジスタであって、
60℃の温度下で、+30Vのゲート電圧を60分間印加し続ける試験の実施前後における閾値電圧の変化量は、0V以上2V以下である
薄膜トランジスタ。 - 請求項7又は8に記載の薄膜トランジスタであって、
60℃の温度下で、-30Vのゲート電圧を60分間印加し続ける試験の実施前後における閾値電圧の変化量は、-2V以上0V以下である
薄膜トランジスタ。 - 請求項1又は2に記載の酸化物半導体薄膜からなる活性層を具備する薄膜トランジスタの製造方法であって、
ゲート電極の上にゲート絶縁膜を形成し、
前記ゲート絶縁膜の上に前記活性層をスパッタリング法で形成し、
前記活性層を下地膜とする金属層を形成し、
前記金属層をウェットエッチング法でパターニングすることでソース電極及びドレイン電極を形成する
薄膜トランジスタの製造方法。 - 請求項1~5に記載の酸化物半導体薄膜を形成するためのスパッタリングターゲット。
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| JP2014229666A (ja) * | 2013-05-20 | 2014-12-08 | 出光興産株式会社 | 薄膜トランジスタ |
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- 2018-11-19 WO PCT/JP2018/042698 patent/WO2019098369A1/ja not_active Ceased
- 2018-11-19 KR KR1020207014695A patent/KR102376258B1/ko active Active
- 2018-11-19 US US16/761,101 patent/US20200357924A1/en not_active Abandoned
- 2018-11-19 CN CN201880074511.4A patent/CN111373514A/zh active Pending
- 2018-11-19 JP JP2019554444A patent/JP6928333B2/ja active Active
- 2018-11-20 TW TW107141216A patent/TWI776995B/zh active
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| WO2012153507A1 (ja) * | 2011-05-10 | 2012-11-15 | 出光興産株式会社 | In2O3-SnO2-ZnO系スパッタリングターゲット |
| JP2016111107A (ja) * | 2014-12-03 | 2016-06-20 | 株式会社Joled | 薄膜トランジスタ及びその製造方法、並びに、表示装置 |
| WO2017099187A1 (ja) * | 2015-12-11 | 2017-06-15 | Tdk株式会社 | 透明導電体 |
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| US20210327961A1 (en) * | 2018-09-04 | 2021-10-21 | Sony Corporation | Imaging element, stacked imaging element, and solid-state imaging device |
| US11800729B2 (en) * | 2018-09-04 | 2023-10-24 | Sony Corporation | Imaging element, stacked imaging element, and solid-state imaging device |
| US12238948B2 (en) * | 2018-09-04 | 2025-02-25 | Sony Group Corporation | Imaging element, stacked imaging element, and solid-state imaging device |
Also Published As
| Publication number | Publication date |
|---|---|
| KR102376258B1 (ko) | 2022-03-17 |
| US20200357924A1 (en) | 2020-11-12 |
| TW201930195A (zh) | 2019-08-01 |
| JPWO2019098369A1 (ja) | 2020-11-19 |
| CN111373514A (zh) | 2020-07-03 |
| JP6928333B2 (ja) | 2021-09-01 |
| KR20200066372A (ko) | 2020-06-09 |
| TWI776995B (zh) | 2022-09-11 |
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