Numerical simulation of high-efficiency, scalable, all-back-contact Cd(Se,Te) solar cells

Abstract

All-back-contact thin-film photovoltaic devices in lattice back contact (LBC) configuration are studied by device simulation to set the requirements for achieving efficiency > 20 % with lateral contact spacing > 50 μ m. The numerical device model is first validated against published data for an LBC perovskite device and extended to predict the performance of Cd(Se,Te)-based polycrystalline devices. Recent advances in the electronic properties of Cd(Se,Te) films have made high efficiency LBC devices feasible with industrially scalable contact dimensions. Constraints on bulk, interface, and contact properties are quantified and discussed.