Applied Materials, Inc.
ANGLED ION IMPLANT TO REDUCE MOSFET TRENCH SIDEWALL ROUGHNESS

Abstract:

Disclosed herein are methods for reducing MOSFET trench sidewall surface roughness. In some embodiments, a method includes providing a device structure including a well formed in an epitaxial layer, forming a plurality of trenches through the well and the epitaxial layer, and implanting the device structure to form a treated layer along a sidewall of just an upper portion of the device structure within each of the plurality of trenches. The method may further include etching the device structure to remove the treated layer.