Patent ID: 12002683

Abstract:
A method of processing a substrate that includes: positioning a substrate in a plasma processing chamber, the substrate including a layer stack of alternating layers of silicon (Si) layers and silicon-germanium (SiGe) layers, the substrate including a recess that exposes sidewalls of the Si layers and sidewalls of the SiGe layers; flowing a first process gas into the plasma processing chamber; while flowing the first process gas, pulsing a second process gas into the plasma processing chamber at a pulsing frequency; while flowing the first process gas and pulsing the second process gas, applying power to a source electrode and a bias electrode of the plasma processing chamber to generate a plasma in the plasma processing chamber; and exposing the substrate to the plasma to laterally etch a portion of the Si layers selectively to the SiGe layers and form indents between the SiGe layers.