Patent ID: 7960204
Filing Date: 2011-06-14
Classification: H01L,Y02E

Abstract:
1. A method for forming a thin film photovoltaic device, the method comprising: providing a transparent substrate comprising a surface region; forming a first electrode layer overlying the surface region of the transparent substrate; forming a thin layer of at least copper gallium material or gallium sulfide material, using a sputtering target of copper gallium material or gallium sulfide material, respectively, overlying the first electrode layer to act as an intermediary adhesive layer to facilitate attachment to the first electrode layer; forming a copper layer overlying the thin layer of at least copper gallium material or gallium sulfide material; forming an indium layer overlying the copper layer to form a multilayered structure including at least the thin layer, copper layer, and the indium layer; subjecting at least the multilayered structure to thermal treatment process in an environment containing sulfur bearing species to form a copper indium disulfide alloy material, the copper indium disulfide alloy material comprising an atomic ratio of copper:indium ranging from about 1.2:1 to about 3.0:1 overlying a copper gallium disulfide material converted from the thin layer of at least copper gallium material or gallium sulfide material; and forming a window layer overlying the copper indium disulfide alloy material.