JP6129206B2 - Tftアレイ基板の製造方法 - Google Patents
Tftアレイ基板の製造方法 Download PDFInfo
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 8
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- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 229910052715 tantalum Inorganic materials 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 229910052721 tungsten Inorganic materials 0.000 claims description 4
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- 229910052738 indium Inorganic materials 0.000 claims description 3
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- 229910052782 aluminium Inorganic materials 0.000 claims description 2
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- 229910052710 silicon Inorganic materials 0.000 description 4
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- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
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- 150000002739 metals Chemical class 0.000 description 3
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 3
- 229910004205 SiNX Inorganic materials 0.000 description 2
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Description
グレートーン又はハーフトーンマスクによって、1回のパターニング工程で基板上に金属酸化物半導体層及びエッチングストップ層を形成するステップS1と、
グレートーン又はハーフトーンマスクによって、1回のパターニング工程でステップS1が完了した基板上にソース電極、ドレイン電極、データライン及び画素電極を形成するステップS2と、
ステップS2が完了した基板上にゲート絶縁層を形成し、そして、1回のパターニング工程によって接触ビアホールを形成するステップS3と、
ステップS3が完了した基板上に、1回のパターニング工程で、ゲート電極及びゲート走査線を形成するステップS4と、を備える。
実施例1
まず、基板1上に改質層2を堆積し、次に、改質層2上に、金属酸化物半導体膜3’及びエッチングストップフィルム4’を順に堆積し、グレートーンまたはハーフトーンマスクによって1回のパターニング工程を行い、エッチングストップ層4及び金属酸化物半導体層3を形成する。
実施例2
2 改質層
3 金属酸化物半導体層
3’ 金属酸化物半導体膜
4 エッチングストップ層
4’ エッチングストップフィルム
5 透明画素電極
5’ 透明導電膜
6 ドレイン電極
6’ ソース/ドレイン金属膜
7 ソース電極
8 ゲート絶縁層
9 ゲート電極
10 データライン
11 ゲート走査線
12 フォトレジスト
Claims (10)
- TFTアレイ基板の製造方法であって、
パターニング工程によって、基板上に、金属酸化物半導体層、エッチングストップ層、ソース電極、データライン、ドレイン電極、画素電極、ゲート絶縁層、接触ビアホール、ゲート電極及びゲート走査線をそれぞれ形成するステップを備え、
前記金属酸化物半導体層及びエッチングストップ層は、1回のパターニング工程によって形成され、
前記ソース電極、ドレイン電極、画素電極及びデータラインは、1回のパターニング工程によって形成され、
前記エッチングストップ層は双層構造を有し、
該双層構造では、金属酸化物半導体層と接触する層は、SiO 2 で形成され、且つ低速で堆積され、金属酸化物半導体層から離れる層は、SiN x によって形成され、且つ高速で堆積され、
前記金属酸化物半導体層と接触する層は、前記金属酸化物半導体層から離れる層よりも緻密であることを特徴とするTFTアレイ基板の製造方法。 - グレートーン又はハーフトーンマスクによって、1回のパターニング工程で基板上に金属酸化物半導体層及びエッチングストップ層を形成するステップS1と、
グレートーン又はハーフトーンマスクによって、1回のパターニング工程でステップS1が完了した基板上にソース電極、ドレイン電極、データライン及び画素電極を形成するステップS2と、
ステップS2が完了した基板上にゲート絶縁層を形成し、そして、1回のパターニング工程によって接触ビアホールを形成するステップS3と、
ステップS3が完了した基板上に、1回のパターニング工程によって、ゲート電極及びゲート走査線を形成するステップS4と、を備えることを特徴とする請求項1に記載のTFTアレイ基板の製造方法。 - ステップS1は、
基板上に、金属酸化物半導体膜及びエッチングストップフィルムを順に堆積するS11と、ステップS11が完了した基板上に1層のフォトレジストを塗布するS12と、
グレートーン又はハーフトーンマスクによって前記フォトレジストを露光・現像して、フォトレジスト完全保留領域、フォトレジスト一部保留領域及びフォトレジスト完全除去領域を形成し、前記フォトレジスト完全保留領域は、エッチングストップ層を形成する領域に対応し、前記フォトレジスト一部保留領域は、金属酸化物半導体層を形成する領域に対応し、前記エッチングストップフィルムにおいてフォトレジストに被覆されない領域はフォトレジスト完全除去領域であるS13と、
金属酸化物半導体層を形成するように、ステップS13が完了した基板をエッチングするS14と、
ステップS14が完了した基板をアッシングし、前記フォトレジスト一部保留領域のフォトレジストをアッシングするS15と、
エッチングストップ層を形成するように、ステップS15が完了した基板をエッチングするS16と、
残りのフォトレジストを剥離するS17と、を備えることを特徴とする請求項2に記載のTFTアレイ基板の製造方法。 - ステップS11では、まず、基板上に改質層を堆積し、そして、前記改質層上に、金属酸化物半導体膜及びエッチングストップフィルムを順に堆積し、PECVD法によって改質層を堆積し、前記改質層は酸化物又は窒化物または酸窒化物によって形成され、改質層の厚みの範囲は500〜2000Åであることを特徴とする請求項3に記載のTFTアレイ基板の製造方法。
- ステップS11では、スパッタリング法又は熱蒸着法によって金属酸化物半導体膜を堆積し、前記金属酸化物半導体膜は、非結晶IGZO、HIZO、IZO、a−InZnO、ZnO:F、In2O3:Sn、In2O3:Mo、Cd2SnO4、ZnO:Al、TiO2:Nb又はCd−Sn−Oによって形成され、前記金属酸化物半導体膜の厚みの範囲は100〜2000Åであり、PECVD方法によって金属酸化物半導体膜上にエッチングストップフィルムを堆積し、前記エッチングストップフィルムは、シリコン酸化物又は窒化物または酸窒化物によって形成され、前記エッチングストップフィルムの厚みの範囲は500〜4000Åであることを特徴とする請求項3に記載のTFTアレイ基板の製造方法。
- ステップS2は、
基板上に、透明導電膜及びソース/ドレイン金属膜を順に堆積するS21と、
ステップS21が完了した基板上に1層のフォトレジストを塗布するS22と、
グレートーン又はハーフトーンマスクによって前記フォトレジストを露光・現像して、フォトレジスト完全保留領域、フォトレジスト一部保留領域及びフォトレジスト完全除去領域を形成し、前記フォトレジスト完全保留領域は、データライン、ソース電極及びドレイン電極を形成する領域に対応し、前記フォトレジスト一部保留領域は、透明画素電極を形成する領域に対応し、前記ソース/ドレイン金属膜においてフォトレジストに被覆されない領域は、全てフォトレジスト完全除去領域であるS23と、
ソース電極及びデータラインを形成するように、ステップS23が完了した基板をエッチングするS24と、
ステップS24が完了した基板をアッシングし、前記フォトレジスト一部保留領域のフォトレジストをアッシングするS25と、
ドレイン電極及び透明画素電極を形成するように、ステップS25が完了した基板をエッチングするS26と、
残りのフォトレジストを剥離するS27と、を備えることを特徴とする請求項2に記載のTFTアレイ基板の製造方法。 - ステップS21では、スパッタリング法または熱蒸着法によって透明導電膜を堆積し、前記透明導電膜は、ITO又は他の金属酸化物で形成され、前記透明導電膜の堆積厚みが300〜1500Åであり、ソース/ドレイン金属膜は、スパッタリング法または熱蒸着法によって形成され、前記ソース/ドレイン金属膜は、Cr、W、Ti、Ta、Mo、Al又はCuで形成され、あるいは、前記金属の一部の合金で形成され、前記ソース/ドレイン金属膜の厚みの範囲は2000〜3000Åであることを特徴とする請求項6に記載のTFTアレイ基板の製造方法。
- ステップS3では、前記ステップS2が完了した基板上に、堆積によってゲート絶縁層を形成し、ゲート絶縁層はPECVD方法によって堆積され、前記ゲート絶縁層は、酸化物又は窒化物又は酸窒化合物によって形成され、前記ゲート絶縁層の厚みの範囲は1000〜4000Åであることを特徴とする請求項2に記載のTFTアレイ基板の製造方法。
- ステップS4では、ゲート絶縁層上にゲート金属膜を堆積し、そして、1回のフォトエッチング工程によってゲート電極及びゲート走査線を形成し、ゲート絶縁層上に、スパッタリング法又は熱蒸着法によってゲート金属膜を堆積し、前記ゲート金属膜は、Cr、W、Cu、Ti、Ta又はMoによって形成され、又は前記金属の中の一部の合金によって形成され、前記ゲート金属膜の厚みの範囲は4000〜15000Åであることを特徴とする請求項2に記載のTFTアレイ基板の製造方法。
- 前記TFTは、活性層としての前記金属酸化物半導体層と、前記金属酸化物半導体層上に形成される前記エッチングストップ層と、一端が前記金属酸化物半導体層上にある前記ソース電極と、前記ソース電極と対向する一端も前記金属酸化物半導体層上にある前記ドレイン電極と、前記ソース電極、前記ドレイン電極及び前記エッチングストップ層を被覆するように形成される前記ゲート絶縁層と、前記ゲート絶縁層上に形成され、且つ前記金属酸化物半導体層の上方にある前記ゲート電極と、を備えるように形成されることを特徴とする請求項1に記載のTFTアレイ基板の製造方法。
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