Patent ID: 9647140
Date: 2017-05-09
CPC Classifications: H01L

Claim:
1. A thin film transistor, adapted to be disposed on a substrate, the thin film transistor comprising: a gate, disposed on the substrate; a gate insulation layer, covering the gate and the substrate; a first source/drain, disposed on the gate insulation layer; a semiconductor layer, disposed above the gate, extending from the gate insulation layer to the first source/drain and comprising a first portion disposed on the first source/drain and a second portion connected with the first portion, wherein an electrical conductivity of the first portion is higher than an electrical conductivity of the second portion; a second source/drain, covering and contacting the second portion; and a dielectric layer, covering the first source/drain, the gate insulation layer and the semiconductor layer, wherein the dielectric layer comprises an opening and a first contact window, the opening exposes the first portion and the first contact window exposes part of the second portion, the second source/drain contacts the second portion of the semiconductor layer through the first contact window of the dielectric layer.