Patent ID: 8585936

Claim:
A process for making a photovoltaic absorber layer having a predetermined stoichiometry of a Group 11 atom on a substrate, the process comprising depositing a polymeric precursor having the predetermined stoichiometry onto the substrate and converting the deposited precursor into a photovoltaic absorber material, wherein the precursor has a predetermined stoichiometry according to the empirical formula M A1 x (M B1 1-y M B2 y ) v ((S 1-z Se z )R) w , wherein M A1 is Cu, M B1 is In, M B2 is Ga, x is from 0.5 to 1.5, y is from 0 to 1, z is from 0 to 1, v is from 0.5 to 1.5, w is from 2 to 6, and R represents R groups, of which there are w in number, which are independently selected from alkyl, aryl, heteroaryl, alkenyl, amido, and silyl.