Patent ID: 9202943
Filing Date: 2015-12-01
Classification: H01L,Y02E,Y02P

Abstract:
1. A photovoltaic device, comprising: a thermal stress relieving layer comprising niobium located directly on top of a substrate, the substrate comprising glass, wherein the thermal stress relieving layer has a thickness of about 0.5 microns (μm) to about 2.0 μm; a back ohmic contact comprising molybdenum located directly on top of the thermal stress relieving layer; and a p-type semiconductor photon absorber layer located directly on top of the back ohmic contact; wherein the back ohmic contact comprises a metallic compound of a sacrificial back electrode metal layer and the absorber layer, and wherein the thermal stress relieving layer has a substantially similar thermal expansion coefficient with respect to the substrate and the absorber layer and a lower Young's modulus with respect to the sacrificial back electrode metal layer, and wherein the sacrificial back electrode metal layer has a thickness of about 60 nanometers (nm).