Patent ID: 7682912

Claim:
A method of forming a III-V compound semiconductor structure, comprising: providing a III-V compound semiconductor substrate including a semi-insulating substrate having at least one epitaxial layer formed thereon, and further having a gate insulator overlying the at least one epitaxial layer, wherein the at least one epitaxial layer formed on the semi-insulating substrate comprises an epi-structure suitable for use in the formation of a channel of a III-V compound semiconductor MOSFET device, the channel having a first polarity; forming a charge layer at a surface of the gate insulator, the charge layer having a second polarity, wherein the second polarity is opposite to the first polarity; forming source and drain contacts, wherein the source and drain contacts extend from the surface of the compound semiconductor structure and into the epi-structure, wherein forming the source and drain contacts defines a channel region within the epi-structure between the source and drain contacts; and forming a gate contact overlying the gate insulator and positioned between a location of the source and drain contacts, wherein forming the gate contact includes forming the gate contact in a gate region, further in the absence of the charge layer at the surface of the gate insulator underlying the gate contact in the gate region, wherein a portion of the charge layer at the surface of the gate insulator remains in access regions defined by a first access region extending between the source contact and the gate contact and a second access region extending between the drain contact and the gate contact.