Patent ID: 8481378
Filing Date: 2013-07-09
Classification: H01L

Abstract:
1. A method, comprising: masking a surface of a layer on a semiconductor substrate, the layer comprising silicon or silicon-germanium, to define an unmasked area of the layer; implanting a Boron dopant into said unmasked area of the layer to produce a surface region of the layer doped with Boron; removing the masking to reveal a non-Boron doped surface region of the layer; baking the semiconductor substrate to passivate the semiconductor substrate; wherein baking comprises baking at a temperature which is below a temperature such that passivation is not achieved in the surface region doped with Boron but passivation is achieved in the non-Boron doped surface region; performing a deposition on the surface of the layer in the absence of a mask which results in selective growth of silicon or silicon-germanium over the passivated non-Boron doped surface region to form a first region of the layer having a first thickness and wherein growth is suppressed over the non-passivated surface region doped with Boron to form a second region of the layer having a second thickness less than the first thickness.