Patent ID: 8476125
Filing Date: 2013-07-02
Classification: H01L

Abstract:
1. A method of forming a high electron mobility transistor (HEMT) device, the method comprising: providing a HEMT structure comprising a substrate, a buffer layer over the substrate, a spacer layer over the buffer layer, and a group III nitride epilayer over the spacer layer; positioning a source metal electrode and a drain metal electrode on the group III nitride epilayer; etching a first recess in the group III nitride epilayer; after formation of the first recess in the group III nitride epilayer, fluorine isolation etching in the first recess; thereafter, etching a second recess in the group III nitride epilayer, wherein the second recess is positioned within the first recess; thereafter, depositing a dielectric layer in the second recess; and thereafter, positioning a gate electrode on the dielectric layer deposited in the second recess.