Patent ID: 7651927

Claim:
A semiconductor device comprising: a substrate and a semiconductor layer formed on the substrate, wherein the substrate includes: a first indentation region provided in a main surface thereof and formed with first recesses or protrusions; a second indentation region provided to adjoin the first indentation region, formed with second recesses or protrusions; and a flat region provided in a portion of the main surface located on the side of the second indentation region opposite from the first indentation region, the second indentation region has a lower probability of occurrence of growth nuclei than the first indentation region, and has a higher probability of occurrence of growth nuclei than the flat region, in the case where a crystal of a semiconductor is grown on the main surface, and the semiconductor layer is made flat at a boundary between the first indentation region and the second indentation region, and at a boundary between the second indentation region and the flat region.