Patent ID: 6503848
Filing Date: 2003-01-07
Classification: H01L

Abstract:
A method of forming a smooth polysilicon layer, comprising:providing a substrate; depositing a layer of polysilicon having a top surface on said substrate wherein said top surface of said layer of polysilicon has polysilicon grains so that said top surface has peaks and valleys; depositing a layer of a polymer having a top surface on said layer of polysilicon using chemical vapor deposition, wherein said top surface of said layer of said polymer is at least a first distance above the peaks of said top surface of said layer of polysilicon and said polymer is deposited using a high density polymer etcher using a top power of between about 100 and 500 watts, a bottom power of between about 10 and 50 watts, a flow of CH2F2 of between about 10 and 100 standard cubic centimeters per minute, and a flow of HBr of between about 10 and 100 standard cubic centimeters per minute; etching away said layer of said polymer and part of said layer of polysilicon, thereby leaving a uniform thickness of said polysilicon having a smooth top surface over said substrate.