【摘 要】
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Organo-lead halide perovskites(OHPs)possess superior optoelectronic properties and have achieved an amazing certified power conversion efficiency(PCE)of 25.5％in perovskite solar cells(PSCs)[1].Recent studies revealed that the organic cations such as methy
【机 构】
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School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China
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Organo-lead halide perovskites(OHPs)possess superior optoelectronic properties and have achieved an amazing certified power conversion efficiency(PCE)of 25.5％in perovskite solar cells(PSCs)[1].Recent studies revealed that the organic cations such as methylammonium(MA+)and formamidinium(FA+)and anions with weak electro-negativity such as I in OHPs were causing instability.The release of gas species,such as CH3NH2,CH3I,NH3,HI,I2,HN=CHNH2,HI,HCN,were observed when OHPs were under heat,illumination,and vacuum stresses,causing de-vice failure[2,3].Complete substitution of organic canions with inorganic ones(i.e.,cesium)and partial substitution of I with Br-to prepare CsPbIxBr3-x is an effective approach to improving device stability.In the last few years,advanced thin-film deposition,defect passivation and interface opti-mization methods were developed to boost CsPbI2Br PSCs with over 17％efficiency[4].However,a large gap between practical and theoretical PCE still exists in the state-of-the-art CsPbI2Br PSCs,largely due to uncontrolled electrical loss.
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