Patent ID: 8097919
Filing Date: 2012-01-17
Classification: H01L

Abstract:
1. An electronic device, comprising: a drift layer having a first conductivity type, and including a first portion and a second portion; a buffer layer on the drift layer and having a second conductivity type, and including a third portion and a fourth portion, wherein the buffer layer defines a first mesa that is on the first portion of the drift layer and forms a P−N junction with the drift layer, and wherein the buffer layer is not on the second portion of the drift layer and wherein the buffer layer includes an upper corner that is spaced apart vertically from the drift layer by a thickness of the buffer layer; a second layer on the buffer layer opposite the drift layer and having the second conductivity type, wherein the second layer defines a second mesa that is on the third portion of the buffer layer and that is not on the fourth portion of the buffer layer adjacent the second portion of the drift layer and wherein the second layer includes a lower corner in contact with the buffer layer that is spaced apart horizontally from the upper corner of the buffer layer by a distance W; a junction termination region in the second portion of the drift layer, wherein the junction termination region has the second conductivity type; and a buried junction extension in the first portion of the drift layer that has the second conductivity type, that is in direct contact with the buffer layer, and that is at least partially beneath the fourth portion of the buffer layer.