Surface versus Bulk Currents and Ionic Space-Charge Effects in CsPbBr3 Single Crystals
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Show full item recordcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/160292
comunitat-uji-handle3:10234/160293
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INVESTIGACIONMetadata
Title
Surface versus Bulk Currents and Ionic Space-Charge Effects in CsPbBr3 Single CrystalsAuthor (s)
Date
2022-04-25Publisher
American Chemical SocietyISSN
1948-7185Bibliographic citation
Osbel Almora, Gebhard J. Matt, Albert These, Andrii Kanak, Ievgen Levchuk, Shreetu Shrestha, Andres Osvet, Christoph J. Brabec, and Germà Garcia-Belmonte The Journal of Physical Chemistry Letters 2022 13 (17), 3824-3830 DOI: 10.1021/acs.jpclett.2c00804Type
info:eu-repo/semantics/articleVersion
info:eu-repo/semantics/publishedVersionSubject
Abstract
CsPbBr3 single crystals have potential for application in ionizing-radiation detection devices due to their optimal optoelectronic properties. Yet, their mixed ionic–electronic conductivity produces instability and ... [+]
CsPbBr3 single crystals have potential for application in ionizing-radiation detection devices due to their optimal optoelectronic properties. Yet, their mixed ionic–electronic conductivity produces instability and hysteretic artifacts hindering the long-term device operation. Herein, we report an electrical characterization of CsPbBr3 single crystals operating up to the time scale of hours. Our fast time-of-flight measurements reveal bulk mobilities of 13–26 cm2 V–1 s–1 with a negative voltage bias dependency. By means of a guard ring (GR) configuration, we separate bulk and surface mobilities showing significant qualitative and quantitative transport differences. Our experiments of current transients and impedance spectroscopy indicate the formation of several regimes of space-charge-limited current (SCLC) associated with mechanisms similar to the Poole–Frenkel ionized-trap-assisted transport. We show that the ionic-SCLC seems to be an operational mode in this lead halide perovskite, despite the fact that experiments can be designed where the contribution of mobile ions to transport is negligible. [-]
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The Journal of Physical Chemistry Letters 2022 13 (17), 3824-3830Related data
https://pubs.acs.org/doi/10.1021/acs.jpclett.2c00804Funder Name
European Union’s Horizon 2020 | Deutsche Forschungsgemeinschaft (DFG)
Project code
info:eu-repo/grantAgreement/EC/H2020/871336 | MA 6617/1-1
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© 2022 The Authors. Published by American Chemical Society
info:eu-repo/semantics/openAccess
info:eu-repo/semantics/openAccess
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