Patent ID: 9640649
Date: 2017-05-02
CPC Classifications: H01L

Claim:
1. A power semiconductor device, comprising: a III-nitride based heterojunction including a first III-nitride layer having a band gap, and a second III-nitride layer having another band gap over said first III-nitride layer; a source electrode electrically connected to and disposed over said second III-nitride layer; a first drain electrode and a second drain electrode electrically connected to said second III-nitride layer; a gate structure including a single gate electrode having two spaced parallel portions and two curved connecting portions connecting said two spaced parallel portions, said single gate electrode surrounding said source electrode, said source electrode and said gate structure situated between said first drain electrode and said second drain electrode; and a field relaxation feature disposed over said second III-nitride layer adjacent said gate structure, wherein said field relaxation feature includes an ultra resistive field plate comprised of a semiconductor, wherein said gate structure is in direct contact with both of said second III-nitride layer and said ultra resistive field plate, wherein said ultra resistive field plate contacts said first drain electrode and said second drain electrode, extends inward from said first drain electrode and said second drain electrode to said gate structure and terminates at said gate structure such that said ultra resistive field plate is spaced apart from said source electrode.