Patent ID: 8071875

Claim:
A semiconductive ink for printing semiconductor photovoltaic cells comprising: a plurality of micro-sized particulates of one or more chalcopyrite compounds with the size between 0.4-4 um and having the general formula of CuIn x Ga 1-x Se y S 2-y wherein x=0-1, y=0-2; a plurality of nano-sized particulates of one or more chalcopyrite compounds with the size of 2-350 nm and having the general formula of CuIn x Ga 1-x Se y S 2-y wherein x=0-1, y=0-2; a plurality of solvents consisting of heteroatom of N, O and P for dissolving and stabilizing nano-sized particulates; a polymer thickening agent to stabilize the nanoparticle ink, and the polymer thickening agent is a thermal decomposable polymer (TDP) that will subject a complete removal upon heating not higher than 550Â° C., and that contains a source of sodium to dope CIGS semiconductor and to enhance the crystalline perfection of chalcopyrite semiconductor a plurality of liquid vehicle.