Patent ID: 6737731
Filing Date: 2004-05-18
Classification: H01L,Y02E,Y10S

Abstract:
A semiconductor diode comprising:a first semiconductor layer including a dopant having a first conductivity type; a second semiconductor layer adjacent said first semiconductor layer and including a dopant having the first conductivity type and having a dopant concentration less than a dopant concentration of said first semiconductor layer; an intermediate semiconductor layer between said first semiconductor layer and said second semiconductor layer and in physical contact with said second semiconductor layer, said intermediate semiconductor layer including a dopant having the first conductivity type and having a dopant concentration between the dopant concentration of said first semiconductor layer and the dopant concentration of said second semiconductor layer; a third semiconductor layer adjacent said second semiconductor layer and including a dopant having the first conductivity type and having a dopant concentration greater than the dopant concentration of said second semiconductor layer; a fourth semiconductor layer in physical contact with said third semiconductor layer and including a dopant of a second conductivity type, said fourth semiconductor layer having a lower dopant concentration than the first semiconductor layer; and respective contacts connected to said first and fourth semiconductor layers.