JP6538307B2 - 半導体装置及びその作製方法 - Google Patents
半導体装置及びその作製方法 Download PDFInfo
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- JP6538307B2 JP6538307B2 JP2014063617A JP2014063617A JP6538307B2 JP 6538307 B2 JP6538307 B2 JP 6538307B2 JP 2014063617 A JP2014063617 A JP 2014063617A JP 2014063617 A JP2014063617 A JP 2014063617A JP 6538307 B2 JP6538307 B2 JP 6538307B2
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- Prior art keywords
- film
- oxide
- insulating film
- conductive
- semiconductor
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- 239000000463 material Substances 0.000 claims description 31
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- 229910052782 aluminium Inorganic materials 0.000 claims description 24
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 24
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- 239000010949 copper Substances 0.000 claims description 24
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 8
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- 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
- H01L29/78606—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device
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Description
本実施の形態では、本発明の一態様である半導体装置及びその作製方法について図面を参照して説明する。
本実施の形態では、実施の形態1における一対の電極の形成方法と異なる方法を図2及び図4を用いて説明する。
本実施の形態では、半導体膜として酸化物半導体膜を用いて形成した場合、酸化物半導体膜の欠陥量をさらに低減することが可能なトランジスタを有する半導体装置について図面を参照して説明する。本実施の形態で説明するトランジスタは、実施の形態1と比較して、酸化物半導体膜、及び酸化物半導体膜に接する酸化物膜を有する多層膜を有する点が異なる。
本実施の形態では、本発明の一態様である半導体装置について、図面を用いて説明する。なお、本実施の形態では、表示装置を例にして本発明の一態様である半導体装置を説明する。また、本実施の形態では、半導体膜として酸化物半導体膜を用いて説明する。
本実施の形態では、上記実施の形態で説明した半導体装置に含まれているトランジスタにおいて、半導体膜14及び酸化物膜15に適用可能な一態様について説明する。なお、ここでは、半導体膜14として酸化物半導体を用いている。また、酸化物半導体膜を一例に用いて説明するが、酸化物膜も同様の構造とすることができる。
Claims (2)
- ゲート電極と、
前記ゲート電極と接する領域を有するゲート絶縁膜と、
前記ゲート絶縁膜と接する領域を有し、前記ゲート電極と重なる領域を有する酸化物半導体膜と、
前記酸化物半導体膜と接する領域を有し、導電性を有する一対の第1の保護膜と、
前記一対の第1の保護膜と接する領域を有する、銅、アルミニウム、金、銀、又はモリブデンを有する一対の第1の導電膜と、
前記一対の第1の導電膜における、前記一対の第1の保護膜が接する面と反対の面で接する第1の領域を有する一対の第2の保護膜と、
絶縁膜と、を有するトランジスタと、
前記ゲート電極と同一の材料を有する第2の導電膜と、
前記第1の保護膜と同一の材料を有する第3の保護膜と、
前記第3の保護膜と接する領域を有し、前記第1の導電膜と同一の材料を有する第3の導電膜と、
前記第3の導電膜と接する領域を有し、前記第2の保護膜と同一の材料を有する第4の保護膜と、
透光性を有する第4の導電膜と、を有し、
前記一対の第2の保護膜は、前記一対の第1の導電膜より外側に突出した第2の領域を有し、
前記絶縁膜は、前記酸化物半導体膜と接する領域、及び前記第2の領域と接する領域を有し、
前記第4の導電膜は、前記第2の導電膜と電気的に接続され、
前記第4の導電膜は、前記第3の導電膜と接する領域を有することを特徴とする半導体装置。 - ゲート電極、ゲート絶縁膜、酸化物半導体膜、一対の第1の保護膜、銅、アルミニウム、金、銀、又はモリブデンを有する一対の第1の導電膜、一対の第2の保護膜、及び絶縁膜を有するトランジスタと、
第2の導電膜と、第3の保護膜と、第3の導電膜と、第4の保護膜と、透光性を有する第4の導電膜と、を有する半導体装置の作製方法であって、
前記ゲート電極、及び前記第2の導電膜を形成する工程と、
前記ゲート絶縁膜を形成する工程と、
前記酸化物半導体膜を形成する工程と、
第1の膜、第2の膜、及び第3の膜を順に形成する工程と、
前記第3の膜をエッチングすることで、前記一対の第2の保護膜、及び前記第4の保護膜を形成する工程と、
前記一対の第2の保護膜、及び前記第4の保護膜をマスクとして前記第2の膜をエッチングすることで、側面が前記一対の第2の保護膜より内側に位置する前記一対の第1の導電膜、及び側面が前記第4の保護膜より内側に位置する前記第3の導電膜を形成する工程と、
前記一対の第2の保護膜、及び前記第4の保護膜をマスクとして前記第1の膜をエッチングすることで、前記一対の第1の保護膜、及び前記第3の保護膜を形成する工程と、
前記酸化物半導体膜、前記第2の保護膜、及び前記第4の保護膜と接する領域を有する絶縁膜を形成する工程と、
前記絶縁膜をエッチングすることで、前記第2の導電膜の表面が露出するように第1の開口部を形成するとともに、前記絶縁膜及び前記第4の保護膜をエッチングすることで、前記第3の導電膜の表面が露出するように第2の開口部を形成する工程と、
前記第1の開口部、及び前記第2の開口部を覆い、前記第2の導電膜と前記第3の導電膜とを電気的に接続する前記第4の導電膜を形成する工程と、を有することを特徴とする半導体装置の作製方法。
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