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dc.contributor.authorTailor, Naveen Kumar
dc.contributor.authorMaity, Partha
dc.contributor.authorSatapathi, Soumitra
dc.date.accessioned2021-07-26T13:25:10Z
dc.date.available2021-07-26T13:25:10Z
dc.date.issued2021-07-21
dc.date.submitted2021-05-10
dc.identifier.citationTailor, N. K., Maity, P., & Satapathi, S. (2021). Observation of Negative Photoconductivity in Lead-Free Cs3Bi2Br9Perovskite Single Crystal. ACS Photonics. doi:10.1021/acsphotonics.1c00702
dc.identifier.issn2330-4022
dc.identifier.issn2330-4022
dc.identifier.doi10.1021/acsphotonics.1c00702
dc.identifier.urihttp://hdl.handle.net/10754/670287
dc.description.abstractLight exposure usually causes an increase in photoconductivity in perovskite semiconductors. However, we report here light-induced negative photoconductivity, followed by slow dark self-recovery in a lead-free Cs3Bi2Br9 perovskite single crystal. Femtosecond transient reflection (fs-TR) spectroscopy studies further reveal hole self-trapping at the Vk center (Br2– dimer) in the midband states of this vacancy-ordered perovskite. Subsequently, these charged defect states (Vk) trap photogenerated charge carriers and produce an internal electrical field, which essentially opposes the externally applied field, leading to negative photoconductivity. A highly sensitive prototype photodetector was fabricated with figure of merits estimated as responsivity (6.42 mA/W), detectivity (2.51 × 1012 Jones), and current in a dark to light ratio (∼20). Our observation of this retrospective photocurrent in optically active perovskite materials can be applied for developing highly sensitive detectors.
dc.description.sponsorshipS.S. acknowledges the ISRO Research Grant (STC-1563-PHY). N.K.T. is thankful for the UGC fellowship.
dc.publisherAmerican Chemical Society (ACS)
dc.relation.urlhttps://pubs.acs.org/doi/10.1021/acsphotonics.1c00702
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Photonics, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acsphotonics.1c00702.
dc.titleObservation of Negative Photoconductivity in Lead-Free Cs3Bi2Br9Perovskite Single Crystal
dc.typeArticle
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentKAUST Catalysis Center (KCC)
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalACS Photonics
dc.rights.embargodate2022-07-21
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Physics, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
kaust.personMaity, Partha
refterms.dateFOA2021-07-27T05:40:45Z


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