Patent ID: 6451632
Filing Date: 2002-09-17
Classification: H01L

Abstract:
A manufacturing method of a thin-film transistor substrate, the method comprising:forming a light-shielding gate electrode on a transparent substrate; forming sequentially a gate insulating film covering said gate electrode, a semiconductor film, and an ohmic film; etching said semiconductor film and said ohmic film into a planar semiconductor active film having an area smaller than an area of the gate electrode and an ohmic contact film on an upper surface of the semiconductor active film, respectively, and shielding the entire semiconductor active film from light impinging on the semiconductor active film from a bottom of the substrate; sequentially and continuously forming a low-resistance silicon compound film from one of a-Si:n+ and a silicide, and an electrode film from one of an aluminum and an aluminum alloy, and covering both sides of said semiconductor active film, a surface and both sides of said ohmic contact film, and a surface of said gate insulating film with the low-resistance silicon compound film, and blocking diffusion of h+ from the electrode film to the semiconductor active film using the low-resistance silicon compound film; and etching said ohmic contact film, said low-resistance silicon compound film, and said electrode film to form a first isolated ohmic contact film and a first laminated low-resistance silicon compound film and source electrode both ranging from the first isolated ohmic contact film to said gate insulating film, and a second isolated ohmic contact film and a second laminated low-resistance silicon compound film and drain electrode both ranging from the second isolated ohmic contact film to said gate insulating film.