Transition from Positive to Negative Photoconductance in Doped Hybrid Perovskite Semiconductors
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ArticleAuthors
Haque, MohammedLi, Jin Ling
Abdelhady, Ahmed L.
Saidaminov, Makhsud I.

Baran, Derya

Bakr, Osman

Wei, Su Huai
Wu, Tao

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
3737Date
2019-08-20Embargo End Date
2020-01-01Permanent link to this record
http://hdl.handle.net/10754/656739
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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.201900865Sponsors
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
WileyJournal
Advanced Optical MaterialsAdditional Links
https://onlinelibrary.wiley.com/doi/abs/10.1002/adom.201900865ae974a485f413a2113503eed53cd6c53
10.1002/adom.201900865