Patent ID: 8597990
Filing Date: 2013-12-03
Classification: B82Y,H01L

Abstract:
1. A method for making a thin film transistor, the method comprising the steps of: (a) providing an insulating substrate; (b) forming a carbon nanotube layer on the insulating substrate, the carbon nanotube layer comprises a plurality of carbon nanotubes; (c) applying a source electrode and a drain electrode spaced from each other and connected to two opposite ends of at least one of carbon nanotubes; (d) covering the carbon nanotube layer with an insulating layer; and (e) placing a gate electrode on the insulating layer, the gate electrode being opposite to and electrically insulated from the carbon nanotube layer by the insulating layer, wherein step (b) comprises the substeps of: (b1) forming a strip-shaped catalyst film on the insulating substrate; (b21) placing the insulating substrate with the strip-shaped catalyst film thereon into a chamber; (b22) introducing a protective gas to discharge the air in the chamber; (b23) heating the chamber to a temperature ranging from about 600° C. to 900° C. with the protective gas therein and sustaining the temperature; (b24) introducing a gas mixture with a ratio of carbon source gas and carrying gas ranging from 1:30 to 1:3 for 5 to 30 minutes to grow a strip-shaped carbon nanotube array; and (b3) folding the strip-shaped carbon nanotube array along a direction parallel to a surface of the insulating substrate.