A two-terminal perovskite/perovskite tandem solar cell

Abstract

The first bottom-up solution-processed perovskite–perovskite tandem solar cell has been successfully fabricated <italic>via</italic> an optimized charge recombination layer comprising spiro-OMeTAD/PEDOT:PSS/PEI/PCBM:PEI. The as-fabricated tandem device delivers an open voltage of up to 1.89 V, close to the sum of the two perovskite subcells.