Improved performance of CH3NH3PbBr3 perovskite solar cells utilizing PbI2 precursors

[Display omitted] •Uniform and compact CH3NH3PbBr3 films obtained via the two-step deposition method.•PbI2 precursor led to improved film quality and enhanced photovoltaic performance.•Halide anion exchange between PbI2 and CH3NH3Br occurred.•Suitable precursor seed induced high-quality perovskite c...

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Bibliographic Details
Published inChemical physics letters Vol. 687; pp. 106 - 109
Main Authors Yang, Yang, Zhang, Taiyang, Tian, Hongxiang, Zhao, Zhiguo, Qin, Xiaojun, Wu, Junbo
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.11.2017
Subjects
Anion exchange
CH3NH3PbBr3
Perovskite
Precursor
Solar cell
Solar cell
Perovskite
Anion exchange
CH3NH3PbBr3
Precursor
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Summary:[Display omitted] •Uniform and compact CH3NH3PbBr3 films obtained via the two-step deposition method.•PbI2 precursor led to improved film quality and enhanced photovoltaic performance.•Halide anion exchange between PbI2 and CH3NH3Br occurred.•Suitable precursor seed induced high-quality perovskite crystal growth. High-quality CH3NH3PbBr3 films have been made utilizing the PbI2 precursor via a two-step sequential deposition method. The use of the PbI2 precursor has significantly improved the film quality. UV–Vis results show that the PbI2 precursor leads to moderately enhanced absorptions. XRD and SEM characterizations suggest that compact and uniform films with large grain sizes and high crystallinity can be obtained utilizing PbI2. The power conversion efficiency of the FTO/compact-TiO2/MAPbBr3/Spiro-OMeTAD/Ag device increased from 5.3% to 7.6% after changing the PbBr2 precursor to PbI2. The reaction between PbI2 and excess MABr generated MAPbBr3 through halide anion exchange.
ISSN:0009-2614
1873-4448
DOI:10.1016/j.cplett.2017.09.013