This paper discussed the preparation of ultrathin two-dimensional BiOIO3 material through liquid phase ultrasonic exfoliation and the interface modification between the perovskite layer and the electron transport layer by the ultrathin BiOIO3.That ultrathin BiOIO3 created unique self-induced electric fields due to uneven charge centers within its lattice.This self-induced electric field,positioned between the perovskite layer and the electron transport layer,facilitated electron discharge and reduced electron accumulation,achieving field-effect passivation.Additionally,the high density of negatively charged oxygen atoms in BiOIO3 interacted with uncoordinated Pb2+ ions on the perovskite film surface to form Pb-O bonds,effectively passivating the Pb2+ defects.Ultimately,the combined effect of field-effect passivation and chemical passivation led to a significant increase of open-circuit voltage VOC,increasing the power conversion efficiency from 20.54% to 22.12%.
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基金资助
国家自然科学基金面上项目(62274141)
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