Patent ID: 7063751
Filing Date: 2006-06-20
Classification: H01L

Abstract:
1. A semiconductor substrate comprising: a trench formed in a semiconductor substrate, wherein the trench is open at an upper surface of the semiconductor substrate, wherein the depth of the trench is between 10 μm and 50 μm, and wherein a radius of curvature at a corner defined by a side face and a bottom face of the trench is 1.0 μm or more, and the maximum roughness height of an inner face of the trench is 3 nm or less due to a thermal treatment in a hydrogen atmosphere; and a single crystal semiconductor layer filling the trench, wherein the single crystal semiconductor layer is formed by filling the trench with an epitaxial film after a heat treatment is applied to the trench in a non-oxidizing or non-nitriding atmosphere under a low pressure, wherein the semiconductor substrate is a silicon substrate having a (