High-voltage semiconductor device used as switching element or the like

摘要

A semiconductor device has a first-conductivity-type semiconductor region, second-conductivity-type semiconductor region, and a high-resistance region. The first-conductivity-type semiconductor region is formed on a first-conductivity-type semiconductor body and has an electric resistance higher than that of the first-conductivity-type semiconductor body. The second-conductivity-type semiconductor region is formed on the first-conductivity-type semiconductor region. The high-resistance region is in contact with the first-conductivity-type and second-conductivity-type semiconductor regions and extends from the upper surface of the second-conductivity-type semiconductor region in the direction of the first-conductivity-type semiconductor body.