Flexible All-Perovskite Tandem Solar Cells with High Specific Power

Zhaoning Song, Cong Chen, Chongwen Li, Lei Chen, Yanfa Yan Wright Center for Photovoltaics Innovation and Commercialization, Department of Physics and Astronomy, The University of Toledo, Toledo, OH, United States

High specific power cost-effective thin-film tandem solar cells are desired for space applications. Metal halide perovskites have recently emerged as an ideal candidate for constructing multi-junction thin-film tandem solar cells on lightweight and flexible substrates that promise high specific powers, owing to their tunable bandgap, outstanding optical properties, and low-temperature solution processibility. Here, we report on the in-house preparation of radio-frequency magnetron sputtered indium tin oxide for both the transparent conductive electrode and the interconnecting layer of monolithically integrated all-perovskite tandem solar cells. Our proof-of-concept lightweight and flexible all-perovskite tandem solar cells deliver a stabilized power conversion efficiency of more than 20% and a specific power density of more than 870 W/kg.