Patent ID: 8653562
Filing Date: 2014-02-18
Classification: H01L

Abstract:
1. A high electron mobility transistor (HEMT) comprising sequentially: a substrate; a channel layer positioned above said substrate; a spacing layer positioned above said channel layer; a carrier supply layer positioned above said spacing layer; a Schottky layer positioned above said carrier supply; a first etch stop layer positioned above said Schottky layer; a first n type doped layer positioned above said first etch stop layer, which is formed of Al a second n type doped layer positioned above said first n type doped layer; a gate recess formed by using a multiple selective etching process which is terminated at said Schottky layer; a drain recess positioned at one end of said gate recess, which is formed by using a multiple selective etching process which is terminated at said Schottky layer; a source recess positioned at the other end of said gate recess, which is formed by using a multiple selective etching process which is terminated at said Schottky layer; a gate electrode positioned in said gate recess and formed Schottky contact to said Schottky layer; a drain electrode positioned in said drain recess and said second n type doped layer surrounding said drain recess, which forms ohmic contact to said second n type doped layer and said Schottky layer; and a source electrode positioned in said source recess and said second n type doped layer surrounding said source recess, which forms ohmic contact to said second n type doped layer and said Schottky layer.