Patent ID: 6333277
Filing Date: 2001-12-25
Classification: H01L

Abstract:
A method for reducing non-homogenous density during forming process of borophosphosilicate glass layer, comprising:delivering an oxygen gas through a gas pipeline into a chamber, and delivering a tetraethyl-orthosilicate gas, a tri-ethyl-borate gas and a tri-ethyl-phosphate gas through a reactant pipeline into a bypass pipeline to let said chamber is filled by only said oxygen gas, wherein said bypass pipeline is adjacent to said chamber;closing said reactant pipeline and delivering said tetraethyl-orthosilicate gas, said tri-ethyl-borate gas and said tri-ethyl-phosphate gas into said chamber, whenever flow of said oxygen gas in both said gas pipeline and said chamber is stable and flow of both said tetraethyl-orthosilicate gas, said tri-ethyl-borate gas and said tri-ethyl-phosphate gas in said reactant pipeline also is stable; andperforming at least a process to form a borophosphosilicate glass layer on a wafer that locates inside said chamber.