Patent ID: 9000437
Filing Date: 2015-04-07
Classification: H01L

Abstract:
1. A thin-film semiconductor device, comprising: a substrate; a gate electrode formed above the substrate; a gate insulating film formed on the gate electrode; a channel layer formed of a polycrystalline semiconductor layer on the gate insulating film; an amorphous semiconductor layer formed on the channel layer and having a projecting portion in a surface thereof; and a source electrode and a drain electrode that are formed above the amorphous semiconductor layer, wherein a first portion included in the amorphous semiconductor layer and located closer to the channel layer has a resistivity lower than a resistivity of a second portion included in the amorphous semiconductor layer and located closer to the source electrode and the drain electrode the amorphous semiconductor layer comprises a flat portion and the projecting portion, the second portion of the amorphous semiconductor layer comprises a top portion of the projecting portion, and the first portion of the amorphous semiconductor layer comprises a lower portion of the projecting portion and the flat portion, wherein the projecting portion comprises a single projection, and the flat portion extends laterally from the projecting portion.