Patent ID: 9627576
Date: 2017-04-18
CPC Classifications: H01G,H01L,Y02E

Claim:
1. A method of forming a monolithic tandem photovoltaic device, the method comprising the steps of: coating a substrate with an electrically conductive material; forming a first absorber layer on a side of the electrically conductive material opposite the substrate, wherein the first absorber layer comprises a chalcopyrite material and, during the forming of the first absorber layer, tuning a bandgap of the first absorber layer to be from about 1.0 eV to about 1.9 eV; forming a buffer layer on a side of the first absorber layer opposite the electrically conductive material; forming a transparent front contact on a side of the buffer layer opposite the first absorber layer; forming a hole transporting layer on a side of the transparent front contact opposite the buffer layer; forming a second absorber layer on a side of the hole transporting layer opposite the transparent front contact, wherein the second absorber layer comprises a perovskite material and, during the forming of the second absorber layer, tuning a bandgap of the second absorber layer to be from about 1.5 eV to 3 eV; forming an electron transporting layer on a side of the second absorber layer opposite the hole transporting layer; and forming a transparent top electrode on a side of the electron transporting layer opposite the second absorber layer.