Patent ID: 7641937

Claim:
A process for producing a thin film of an I-III-VI 2 , compound of an element from each of Groups I and III of the Periodic Table with two atoms of a Group VI element, comprising: (i) forming a thin film of an III-VI compound on a substrate by Metal Organic Chemical Vapor Deposition employing a single precursor containing elements of Groups III and VI; (ii) forming a thin film of an I 2 -VI compound on the thin film of the III-VI compound by Metal Organic Chemical Vapor Deposition employing a precursor containing at least one metal of Group I; and (iii) forming a thin film of the I-III-VI 2 compound on the thin film of the I 2 -VI compound by Metal Organic Chemical Vapor Deposition employing a single precursor containing elements of Groups III and VI, wherein, in the steps of the process, the element of Group I is Cu or Ag, the element of Group III is at least one of Al, Ga or In, and the element of Group VI is at least one of S, Se or Te.