Patent ID: 7928013

Claim:
A rework method of a gate insulating layer of a thin film transistor (TFT), comprising steps of: providing a substrate, the substrate including a silicon nitride layer disposed on a surface of the substrate to serve as a gate insulating layer, and a gate disposed between the substrate and the silicon nitride layer; performing a first film removal process to remove the silicon nitride layer on the substrate, the first film removal process comprising performing an inductively coupled plasma (ICP) etching process to etch the silicon nitride layer, wherein the ICP etching process is carried out by introducing gases including sulfur hexafluoride with a flow rate that is substantially between 300 sccm and 500 sccm, and oxygen with a flow rate that is substantially between 150 sccm and 350 sccm, and wherein a process pressure of the ICP etching process is substantially between 80 mtorr and 160 mtorr, and a process power of the ICP etching process is substantially between 2000 W and 3000 W; and performing a second film removal process to remove the gate.