Halide mixing inhibits exciton transport in two-dimensional perovskites despite phase purity
Entity
UAM. Departamento de Física de la Materia Condensada; UAM. Departamento de Física Teórica de la Materia CondensadaPublisher
American Chemical SocietyDate
2021-12-22Citation
10.1021/acsenergylett.1c02403
ACS Energy Letters 7 (2022): 358-365
ISSN
2380-8195 (online)DOI
10.1021/acsenergylett.1c02403Funded by
This work has been supported by the Spanish Ministry of Economy and Competitiveness through the “Mari ́ a de Maeztu” Program for Units of Excellence in R&D (MDM-2014-0377). M.S. acknowledges the financial support through a Doc.Mobility Fellowship from the Swiss National Science Foundation (SNF) with grant number 187676. In addition, M.S. acknowledges the financial support of a fellowship from ”la Caixa” Foundation (ID 100010434). The fellowship code is LCF/BQ/IN17/11620040. Further, M.S. has received funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement No. 713673. F.P. acknowledges support from the Spanish Ministry for Science, Innovation, and Universities through the state program (PGC2018-097236-A-I00) and through the Ramón y Cajal program (RYC-2017-23253), as well as the Comunidad de Madrid Talent Program for Experienced Researchers (2016-T1/IND-1209). M.M., N.C., and R.D.B. acknowledge support from the Spanish Ministry of Economy, Industry, and Competitiveness through Grant FIS2017-86007-C3-1-P (AEI/FEDER, EU). D.N.C. acknowledges the support of the Rowland Fellowship at the Rowland Institute at Harvard University and the Department of Electrical Engineering at Stanford University. M.K.G. acknowledges the support of National Science Foundation Track 1 EPSCoR funding under the grant no. 1757220. D.A.K. acknowledges the support of a Rowland Foundation Postdoctoral FellowshipProject
Gobierno de España. MDM-2014-0377; info:eu-repo/grantAgreement/EC/H2020/713673/EU//INPhINIT; Gobierno de España. PGC2018-097236-A-I00; Gobierno de España. FIS2017-86007-C3-1-PEditor's Version
http://doi.org/10.1021/acsenergylett.1c02403Subjects
Perovskite; Mixing; Excitons; FísicaRights
© 2021 The AuthorsAbstract
Halide mixing is one of the most powerful techniques to tune the optical bandgap of metal-halide perovskites. However, halide mixing has commonly been observed to result in phase segregation, which reduces excited-state transport and limits device performance. While the current emphasis lies on the development of strategies to prevent phase segregation, it remains unclear how halide mixing may affect excited-state transport even if phase purity is maintained. Here, we study exciton transport in phase pure mixed-halide 2D perovskites of (PEA)2Pb(I1-xBrx)4. Using transient photoluminescence microscopy, we show that, despite phase purity, halide mixing inhibits exciton transport. We find a significant reduction even for relatively low alloying concentrations. By performing Brownian dynamics simulations, we are able to reproduce our experimental results and attribute the decrease in diffusivity to the energetically disordered potential landscape that arises due to the intrinsic random distribution of alloying sites
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Google Scholar:Seitz, Michael
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Meléndez, Marc
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York, Peyton
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Kurtz, Daniel A.
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Magdaleno, Alvaro J.
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Alcázar Cano, Nerea
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Kshirsagar, Anuraj S.
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Gangishetty, Mahesh K.
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Delgado Buscalioni, Rafael
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Congreve, Daniel N.
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Prins, Ferry
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