Patent ID: 9018098
Filing Date: 2015-04-28
Classification: H01J,H01L

Abstract:
1. A method of etching a silicon layer through a patterned mask formed thereon using an etch chamber in which the silicon layer is placed, the method comprising: providing a fluorine (F) containing etch gas to etch features into the silicon layer and a silicon (Si) containing chemical vapor deposition gas to form a silicon-containing deposition layer on sidewalls of the features by premixing the etch gas and the chemical vapor deposition gas, the chemical vapor deposition gas containing siloxane vapor; generating a plasma from the etch gas and the chemical vapor deposition gas; providing a bias voltage; etching features into the silicon layer using the plasma through the patterned mask; depositing, using the plasma, a silicon-containing passivation layer on the sidewalls of the features which are being etched, wherein silicon in the passivation layer primarily comes from the chemical vapor deposition gas; and stopping the etch gas and the chemical vapor deposition gas, wherein the method is performed in a steady state such that the etching of the silicon layer and the depositing of the silicon-containing passivation layer occur simultaneously in a non-alternating manner.