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    Transition from Positive to Negative Photoconductance in Doped Hybrid Perovskite Semiconductors

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    Transition from Positive to Negative Photoconductance in Doped Hybrid Perovskite Semiconductors.pdf
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    Description:
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    Type
    Article
    Authors
    Haque, Mohammed
    Li, Jin Ling
    Abdelhady, Ahmed L.
    Saidaminov, Makhsud I. cc
    Baran, Derya cc
    Bakr, Osman cc
    Wei, Su Huai
    Wu, Tao cc
    KAUST Department
    Functional Nanomaterials Lab (FuNL)
    KAUST Catalysis Center (KCC)
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    3737
    Date
    2019-08-20
    Embargo End Date
    2020-01-01
    Permanent link to this record
    http://hdl.handle.net/10754/656739
    
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    Abstract
    Halide perovskites are known to be photoconductive for more than half a century, and their efficient photocarrier generation gives rise to positive photoconductivity (PPC). In this work, the discovery of negative photoconductivity (NPC) in hybrid perovskite CH3NH3PbBr3 after Bi doping is reported. Transient photoconductivity measurements reveal a surprising bipolar behavior with a fast positive response followed by exponential negative photocurrent decay, resulting in an equilibrium photocurrent even below the dark level. The NPC effect in Bi-doped CH3NH3PbBr3 is among the largest ones reported so far for semiconductors. It is proposed that the transition to negative photoconductance is related to the presence of DX-like centers in Bi-doped halide perovskites, similar to doped III–V and chalcopyrite semiconductors. Such photogenerated DX-like centers in the Bi-doped CH3NH3PbBr3 can trap mobile band electrons and enhance charge recombination, thus reducing the conductivity. This mechanism is consistent with the observations of crossover from PPC to NPC as functions of temperature, composition, and illumination. The results underscore the importance of defect engineering for tuning the optoelectronic properties of halide perovskites.
    Citation
    Haque, M. A., Li, J., Abdelhady, A. L., Saidaminov, M. I., Baran, D., Bakr, O. M., … Wu, T. (2019). Transition from Positive to Negative Photoconductance in Doped Hybrid Perovskite Semiconductors. Advanced Optical Materials, 7(22), 1900865. doi:10.1002/adom.201900865
    Sponsors
    M.A.H. and J.-L.L. contributed equally to this work. Research reported in this publication was supported by the King Abdullah University of Science and Technology (KAUST). D.B. acknowledges the KAUST competitive research grant (CRG7, No. 3737) for financial support. The work at CSRC was supported by the National Key Research and Development Program of China under Grant No. 2016YFB0700700, the National Nature Science Foundation of China under Grant Nos. 51672023, 11634003, and U1530401; and the Science Challenge Project under Grant No. TZ20160003.
    Publisher
    Wiley
    Journal
    Advanced Optical Materials
    DOI
    10.1002/adom.201900865
    Additional Links
    https://onlinelibrary.wiley.com/doi/abs/10.1002/adom.201900865
    ae974a485f413a2113503eed53cd6c53
    10.1002/adom.201900865
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Catalysis Center (KCC); KAUST Solar Center (KSC)

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