Patent ID: 7485512
Filing Date: 2009-02-03
Classification: H01L

Abstract:
1. A method of compensating resistivity of a near-surface region of a substrate comprising: providing the substrate; measuring a resistivity of the substrate; determining a conductivity type of the substrate; and epitaxially growing a buffer layer on the substrate, the buffer layer being grown as having a dopant concentration selected responsive to the measured resistivity and the determined conductivity type of the substrate, to deplete residual charge within the near-surface region of the substrate, wherein the substrate has n-type conductivity, and the buffer layer is doped with a p-type dopant at the dopant concentration selected responsive to the measured resistivity and the n-type conductivity of the substrate, and wherein the buffer layer is doped with carbon, and aluminum is used to getter the carbon during said epitaxially growing the buffer layer.