【摘 要】
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Over the years,the efficiency of inorganic perovskite solar cells (PSCs) has increased at an unprecedented pace.However,energy loss in the device has limited a
【机 构】
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Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Func
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Over the years,the efficiency of inorganic perovskite solar cells (PSCs) has increased at an unprecedented pace.However,energy loss in the device has limited a further increase in efficiency and commercialization.In this work,we used (NH4)2C2O4·H2O to treat CsPbBrl2 perovskite film during spin-coating.The CsPbBrI2 underwent secondary crystallization to form high quality films with micrometer-scale and low trap density.(NH4)2C2O4·H2O treatment promoted charge transfer capacity and reduced the ideal factor.It also dropped the energy loss from 0.80 to 0.64 eV.The resulting device delivered a power conversion efficiency (PCE) of 16.55％ with an open-circuit voltage (Voc) of 1.24 V,which are largely improved compared with the reference device which exhibited a PCE of 13.27％ and a Voc of 1.10 V.In addition,the optimized treated device presented a record indoor PCE of 28.48％ under a fluorescent lamp of 1000 lux,better than that of the reference device (19.05％).
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