Patent ID: 7867551

Claim:
A process of forming a doped Group IBIIIAVIA absorber layer on a base, comprising: depositing at least one Group IB and Group IIIA and VIA material on the base; forming a partially reacted precursor layer by partially reacting the at least one Group IB and Group IIIA materials with at least one Group VIA material, wherein partially reacting the at least one Group IB and Group IIIA materials with at least one Group VIA material results in the partially reacted precursor layer having at least 50% non-metallic phase; depositing a dopant-bearing film on the partially reacted precursor layer, the dopant-bearing film comprising a dopant material including at least one of Na, K and Li; and fully reacting the partially reacted precursor layer with the dopant material from the dopant-bearing film to form the doped Group IBIIIAVIA absorber layer.