Patent ID: 9112075
Filing Date: 2015-08-18
Classification: H01L,Y02E,Y02P

Abstract:
1. A method for fabricating a copper indium gallium selenium (CIGS)-, copper zinc tin sulfur (CZTS)-, copper indium gallium selenium sulfur (CIGSS)- or copper zinc tin sulfur selenium (CZTSS)- based solar cell, comprising: forming a molybdenum layer on one surface of a substrate; forming a copper layer on the molybdenum layer; forming a light-absorbing powder layer of copper indium gallium selenium or copper zinc tin sulfur on the copper layer; and heat-treating the layers in an atmosphere comprising selenium under conditions wherein the light-absorbing powder layer is converted to a light-absorbing layer, wherein a density and thickness of the copper layer are selected such that the copper layer controls formation of molybdenum diselenide to within a desired limit and such that the copper layer is removed by being absorbed or diffused to the light-absorbing layer as a result of the heat-treating.