Patent ID: 6147013
Filing Date: 2000-11-14
Classification: C23C,H01L

Abstract:
A method of LPCVD silicon nitride deposition for decreasing silicon nitride particles, comprising:(a) providing a semiconductor substrate;(b) positioning said semiconductor substrate in an LPCVD (Low Pressure Chemical Vapor Deposition) tube, and pumping the pressure of said LPCVD tube to a low pressure state;(c) forming a silicon nitride layer overlying the surface of said semiconductor substrate by inputting reactant;(d) sequentially executing a low flow rate nitrogen or inert gas purging step at a gas flow rate of about 100 sccm, followed by a cycle purging step with a gradually increasing gas flow rate from 500 sccm to 1000 sccm and to 2000 sccm;(e) taking said semiconductor substrate out from said LPCVD tube.