JP6768048B2 - 薄膜トランジスタ、薄膜トランジスタの製造方法及び該薄膜トランジスタを含む表示装置 - Google Patents
薄膜トランジスタ、薄膜トランジスタの製造方法及び該薄膜トランジスタを含む表示装置 Download PDFInfo
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- 229910052709 silver Inorganic materials 0.000 description 2
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- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
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- 229910052733 gallium Inorganic materials 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
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- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000000427 thin-film deposition Methods 0.000 description 1
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- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/7869—Thin film transistors, i.e. transistors with a channel being at least partly a thin film having a semiconductor body comprising an oxide semiconductor material, e.g. zinc oxide, copper aluminium oxide, cadmium stannate
- H01L29/78693—Thin film transistors, i.e. transistors with a channel being at least partly a thin film having a semiconductor body comprising an oxide semiconductor material, e.g. zinc oxide, copper aluminium oxide, cadmium stannate the semiconducting oxide being amorphous
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Description
比較例1では、水素供給層125を形成しないことを除いて、実施例1と同様の方法で薄膜トランジスタを製造した。比較例1では、水素供給層125を形成せず、ゲート絶縁膜120及びゲート電極140に波長168nmの紫外線を45分間照射した。
比較例2では、水素供給層125に紫外線を照射しないことを除いて、実施例1と同様の方法で水素供給層125を含む薄膜トランジスタを作製し、これを比較例2とした。
図8は、酸化物半導体層130の導体化時間のグラフである。図8に示すA1は、比較例1のように、水素供給層125を形成せずに紫外線のみを照射した酸化物半導体層130の第1接続部133aにおける抵抗変化を示し、図8に示すA2は、実施例1のように、水素を供給しながら紫外線を照射した酸化物半導体層130の第1接続部133aにおける抵抗変化を示す。
実施例1の薄膜トランジスタの製造過程において、紫外線照射前後の水素供給層125内に含まれたSi−Hの結合の相対的な量を測定した。ここで、測定には赤外線分光分析装置(FT−IR Spectrometer)を使用した。図9は、水素供給層125に含まれたSi−H結合の相対的な量のグラフである。
飛行時間型二次イオン質量分析計(TOF−SIMS:Time of Flight Secondary Ion Mass Spectrometry)を用いて、実施例1による薄膜トランジスタの水素供給層125、ゲート絶縁膜120及び酸化物半導体層130に含まれた水素含有量を測定した。TOF−SIMSは、一定のエネルギーを有する一次イオンを固体表面に入射させた後、放出される二次イオンを分析して、物質の表面を構成している原子及びイオンを分析する装置である。
実施例1及び比較例1における薄膜トランジスタを用いて、第1接続部133aの電子濃度及び水素濃度を測定した。その結果、実施例1による薄膜トランジスタの第1接続部133aは、6×1019個/cm3の電子濃度及び約6原子%の水素濃度を有するのに対し、比較例1による薄膜トランジスタの第1接続部133aは、2×1019個/cm3の電子濃度及び約2原子%の水素濃度を有することを確認した。この結果から、比較例1における薄膜トランジスタの第1接続部133aよりも実施例1における薄膜トランジスタの第1接続部133aの方が優れた導電性を有するといえる。
実施例1及び比較例2における薄膜トランジスタのしきい値電圧(Vth)を測定した。しきい値電圧(Vth)の測定のために、−20Vから+20Vの範囲のゲート電圧(Gate Voltage)を印加しながら、ドレイン電流(Drain Current)を測定した。ソース電極150とドレイン電極160との間には、0.1V又は10Vの電圧が印加された。図11A及び図11Bにおいて、10Vはソース電極150とドレイン電極160との間に10Vの電圧が印加されたときのドレイン電流を示し、0.1Vはソース電極150とドレイン電極160との間に0.1Vの電圧が印加されたときのドレイン電流を示す。
110 基板
120 ゲート絶縁膜
120a 第1領域
120b 第2領域
121 バッファ層
125 水素供給層
130 酸化物半導体層
130a 第1面
131 チャネル部
133a 第1接続部
133b 第2接続部
140 ゲート電極
150 ソース電極
160 ドレイン電極
170 層間絶縁膜
180 光遮断層
190 平坦化膜
191 パッシベーション層
250 バンク層
270 有機発光素子
271,381 第1電極
272 有機層
273,383 第2電極
310 対向基板
320 バリア層
341,342 カラーフィルタ
350 遮光部
382 液晶層
400,500 表示装置
Claims (3)
- 基板上に酸化物半導体層を形成する工程と、
前記酸化物半導体層上にシリコン酸化物及びシリコン窒化物のうち少なくとも一つを含むゲート絶縁膜を形成する工程と、
前記ゲート絶縁膜上に前記酸化物半導体層と少なくとも一部で重畳するゲート電極を形成する工程と、
前記ゲート絶縁膜及び前記ゲート電極上に水素供給層を形成する工程と、
水素を生成して前記酸化物半導体層の接続部に移動させるために前記水素供給層におけるSi−H結合を切断し、前記酸化物半導体層の接続部に酸素欠陥を発生させるため、前記水素供給層に紫外線を照射する工程と、
前記酸化物半導体層と互いに離隔してそれぞれ導体化された前記接続部で接続されたソース電極及びドレイン電極を形成する工程とを含み、
前記ゲート電極と重畳する第1領域及び前記ゲート電極と重畳しない第2領域を含む前記ゲート絶縁膜が、前記基板の反対方向の前記酸化物半導体層上の全面に形成され、
前記水素供給層が2nm以上10nm以下の厚さを有し、
前記水素供給層において、前記ゲート電極と重畳する領域の水素濃度が、前記ゲート電極と重畳しない領域の水素濃度よりも高い、薄膜トランジスタの製造方法。 - 前記水素供給層が、シリコン窒化物によって形成される請求項1に記載の薄膜トランジスタの製造方法。
- 前記紫外線の波長が、150nm以上300nm以下である請求項1に記載の薄膜トランジスタの製造方法。
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