Patent ID: 8436445
Filing Date: 2013-05-07
Classification: H01L,Y02E,Y02P

Abstract:
1. A method of processing a thin film absorber material with enhanced photovoltaic efficiency comprising: providing a soda lime glass substrate having a front surface; forming a barrier layer over the front surface, the barrier layer preventing diffusion of sodium ions from the soda lime glass substrate; forming an electrode which includes molybdenum over the barrier layer; depositing a first mixture of a copper species, gallium species, and sodium species to form a first thickness of a first precursor material over the electrode; depositing a second mixture of a copper species and a gallium species to form a second thickness of a second precursor material over the first precursor material; depositing an indium species to form a third thickness of a third precursor material over the second precursor material, to thereby form a stack structure of the first thickness, the second thickness, and the third thickness; subjecting the soda lime glass substrate and the stack structure to a thermal treatment in the presence of H while doing so transferring a sodium species from a back surface of a soda lime glass substrate.