Patent ID: 7759172
Filing Date: 2010-07-20
Classification: H01L

Abstract:
1. A method for forming a planar combined structure of a gallium nitride (GaN) bipolar junction transistor (BJT) and n-type and p-type metal semiconductor field effect transistors (MESFETs), comprising the steps of: (s1) growing a GaN crystal growth layer having a p-n junction by forming a GaN substrate for crystal growth having an n-type layer and a p-type layer; (s2) forming a collector layer of the GaN BJT, a substrate layer of an n-type MESFET, a buried layer of a p-type MESFET, a base layer of the GaN BJT, a buried layer of the n-type MESFET and a channel layer of the p-type MESFET; (s3) forming a collector well region of the BJT, and an emitter well region of the BJT and a channel region of the n-type MESFET concurrently by using one of an ion implantation method and an impurity diffusion method; (s4) forming a base metal electrode of the BJT and a drain metal electrode and a source metal electrode of the p-type MESFET concurrently; (s5) forming an emitter metal electrode and a collector metal electrode of the BJT and a drain metal electrode and a source metal electrode of the n-type MESFET concurrently; (s6) forming a first gate Schottky metal electrode on the n-type MESFET; (s7) forming a second gate Schottky metal electrode on the p-type MESFET; and wherein steps s1-s7 are conducted in ordered sequence.