Nanoco Technologies Limited

Chet Steinhagen

Ombretta Masala

Christopher Paul Newman

Various methods are used to provide a desired doping metal concentration in a CIGS-containing ink when the CIGS layer is deposited on a photovoltaic device. When the doping metal is sodium, it may be incorporated by: adding a sodium salt, for example sodium acetate, together with the copper-, indium- and/or gallium-containing reagents at the beginning of the synthesis reaction of Cu(In,Ga)(S,Se)nanoparticles; synthesizing Cu(In,Ga)(S,Se)nanoparticles and adding a sodium salt to the reaction solution followed by mild heating before isolating the nanoparticles to aid sodium diffusion; and/or, using a ligand that is capable of capping the Cu(In,Ga)(S,Se)nanoparticles with one end of its molecular chain and binding to sodium atoms with the other end of its chain.

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Saint Paul, MN, United States of America

Chet Steinhagen