Patent ID: 9550664
Date: 2017-01-24
CPC Classifications: B81B,B81C

Claim:
1. A method for manufacturing a microelectromechanical systems (MEMS) device, the method comprising: forming an insulating layer over a substrate; depositing a first polysilicon layer on the insulating layer by reacting a silicon-containing gas, gaseous hydrochloric acid, and hydrogen for a first duration of time at a first temperature, wherein, during the deposition, the gaseous hydrochloric acid is at least 15% of a total flow of the gaseous hydrochloric acid and the silicon-containing gas; etching the first polysilicon layer using gaseous hydrochloric acid and hydrogen for a second duration of time at a second temperature; depositing a second polysilicon layer over the etched first polysilicon layer by reacting the silicon-containing gas and hydrogen for a third duration of time at a third temperature; and patterning the second polysilicon layer and the first polysilicon layer to form a travel stop region of the MEMS device.