Patent ID: 8653531
Filing Date: 2014-02-18
Classification: H01L

Abstract:
1. A thin film transistor that is a back gate type thin film transistor formed on an insulating substrate, comprising: a gate electrode formed on said insulating substrate; a gate insulation film formed so as to cover said gate electrode; a source region and a drain region, made of a semiconductor including an impurity, disposed with a prescribed interval therebetween on said gate insulation film; a source electrode and a drain electrode made of a metal, formed on said source region and said drain region, respectively; and a channel layer formed on a gate insulation film sandwiched between said source electrode and said drain electrode and electrically connected to said source region and said drain region, wherein said channel layer is made of an intrinsic semiconductor having crystallinity, wherein one end of said channel layer on a side of said gate electrode is connected electrically to said source region and the other end on the side of said gate electrode is electrically connected to said drain region, wherein one end of said channel layer on a back channel side is connected electrically to said source electrode and the other end is electrically connected to said drain electrode, wherein a barrier for restricting movement of carriers is formed at a boundary between said source electrode and said channel layer or at a boundary between said drain electrode and said channel layer on the back channel side of the channel layer, wherein said source region and said drain region include respective protrusion parts protruding from respective ends of said source electrode and said drain electrode on the gate insulation film sandwiched between said source electrode and said drain electrode, and wherein said channel layer is further electrically connected to respective upper surfaces of said protrusion parts.