Reverse-conducting IGBT with buffer layer and separation layer for reducing snapback

Abstract(summary):

In the reverse-conducting IGBT according to the present invention, an n-type buffer layer surrounds a p-type collector layer. A p-type separation layer surrounds an n-type cathode layer. The n-type buffer layer separates the p-type collector layer and the p-type separation layer from each other. The p-type separation layer separates the n-type cathode layer and the n-type buffer layer from each other. Therefore, the present invention makes it possible to reduce snapback.