Patent ID: 7514759

Claim:
A process for fabricating a combined micro electromechanical/gallium nitride (GaN) structure, the process comprising: providing a substrate; depositing a GaN layer on the substrate; obtaining a GaN transistor structure; depositing and patterning a first metal layer on the GaN layer; depositing a non-metal separation layer on the GaN layer and on the GaN transistor structure; patterning the non-metal separation layer to form a protective region to protect the GaN transistor structure; depositing a sacrificial layer on the protective region, the patterned first metal layer and at least a portion of the GaN layer so as to leave a further portion of the GaN layer between the protective region and the patterned first metal layer exposed; depositing and patterning a second metal layer on the sacrificial layer; depositing a support layer on the sacrificial layer, the patterned second metal layer and the exposed GaN layer; providing a piezoelectric structure on the support layer; patterning the support layer in proximity of the GaN transistor structure to provide access holes; removing the non-metal separation layer and the sacrificial layer from the proximity of the GaN transistor structure through the access holes; providing a metal overlay above the GaN transistor structure, the metal overlay forming a gate of the GaN transistor structure; providing a gate passivation layer above the gate of the GaN transistor structure; providing a further metal layer above the gate passivation layer; and removing the sacrificial layer between the first patterned metal layer and the second patterned metal layer.