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dc.contributor.authorHaque, Mohammed
dc.contributor.authorLi, Jin Ling
dc.contributor.authorAbdelhady, Ahmed L.
dc.contributor.authorSaidaminov, Makhsud I.
dc.contributor.authorBaran, Derya
dc.contributor.authorBakr, Osman
dc.contributor.authorWei, Su Huai
dc.contributor.authorWu, Tao
dc.date.accessioned2019-09-12T07:38:51Z
dc.date.available2019-09-12T07:38:51Z
dc.date.issued2019-08-20
dc.identifier.citationHaque, 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
dc.identifier.doi10.1002/adom.201900865
dc.identifier.urihttp://hdl.handle.net/10754/656739
dc.description.abstractHalide 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.
dc.description.sponsorshipM.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.
dc.publisherWiley
dc.relation.urlhttps://onlinelibrary.wiley.com/doi/abs/10.1002/adom.201900865
dc.rightsArchived with thanks to Advanced Optical Materials
dc.subjectdoping
dc.subjectDX centers
dc.subjecthybrid perovskites
dc.subjectnegative photoconductance
dc.titleTransition from Positive to Negative Photoconductance in Doped Hybrid Perovskite Semiconductors
dc.typeArticle
dc.contributor.departmentFunctional Nanomaterials Lab (FuNL)
dc.contributor.departmentKAUST Catalysis Center (KCC)
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentMaterial Science and Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalAdvanced Optical Materials
dc.rights.embargodate2020-01-01
dc.eprint.versionPost-print
dc.contributor.institutionBeijing Computational Science Research Center, Beijing, 100193, China
dc.contributor.institutionSchool of Materials Science and Engineering, University of New South Wales (UNSW), Sydney, NSW, 2052, Australia
kaust.personHaque, Mohammed
kaust.personAbdelhady, Ahmed L.
kaust.personSaidaminov, Makhsud I.
kaust.personBaran, Derya
kaust.personBakr, Osman M.
kaust.grant.number3737
refterms.dateFOA2019-09-15T12:29:14Z


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