Three-Terminal Perovskite/Silicon Tandem Solar Cells with Top and Interdigitated Back-Contacts

Tandem solar cells are a promising approach to overcome the inherent limitations of power conversion efficiency of solar cells based on a single silicon absorber. In that regard, metal-halide perovskites have proven to be a suitable candidate for complementing silicon in a tandem device. Here, we present the first experimental realization of a rather uncommon approach for subcell interconnection: a three-terminal configuration featuring a bottom cell with interdigitated back-contact. Our so far best device reaches an efficiency of 17.1%. We analyze the still apparent limitations of these proof-of-concept devices by means of optoelectronic characterization and equivalent electrical circuit simulations.