Patent ID: 8822348
Filing Date: 2014-09-02
Classification: C23C,H01L

Abstract:
1. A method of forming dummy wafer structure, the method comprising: a first step of forming a silicon nitride layer over a silicon substrate so as to form a silicon-silicon nitride structure; and a second step of forming a silicon dioxide layer over the silicon-silicon nitride structure obtained in the first step so as to form a silicon-silicon nitride-silicon dioxide structure, wherein in the second step, the silicon-silicon nitride structure obtained in the first step is disposed in a low-pressure chemical-vapor deposition furnace with a temperature of 750° C. to 800° C., a pressure of 0.3 Torr to 0.5 Torr, and a reaction gas of dichlorosilane and nitrous oxide to deposit a silicon dioxide layer with a thickness of 10 Å to 50 Å over the silicon-silicon nitride structure so as to form the silicon-silicon nitride-silicon dioxide structure.