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The first bottom-up solution-processed perovskite–perovskite tandem solar cell has been successfully fabricated via 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.
Jiang et al. (Tue,) studied this question.