Patent ID: 9583642
Date: 2017-02-28
CPC Classifications: H01L

Claim:
1. A diode comprising: a first semiconductor layer of a first conductive type; a second semiconductor layer of a second conductive type, the first semiconductor layer and the second semiconductor layer forming a p-n junction; a third semiconductor layer of the first conductive type, the third semiconductor layer and the second semiconductor layer forming a p-n junction; a fourth semiconductor layer of the second conductive type, the fourth semiconductor layer and the third semiconductor layer forming a p-n junction; and a short circuit member capable of providing a short circuit between the second semiconductor layer and the third semiconductor layer; and wherein a high concentration region is formed in a contact region in the second semiconductor layer, a surface of the contact region and a portion of the third semiconductor layer are in direct contact with the short-circuit member, and the high concentration region is higher in impurity concentration than a non-contact region in the second semiconductor layer which is not in direct contact with the short-circuit member.