Greenland, C., Shnier, A., Rajendran, S.K. et al. (7 more authors) (2020) Correlating phase behavior with photophysical properties in mixed‐cation mixed‐halide perovskite thin films. Advanced Energy Materials, 10 (4). 1901350. ISSN 1614-6832
Abstract
Mixed cation perovskites currently achieve very promising efficiency and operational stability when used as the active semiconductor in thin‐film photovoltaic devices. However, an in‐depth understanding of the structural and photophysical properties that drive this enhanced performance is still lacking. Here the prototypical mixed‐cation mixed‐halide perovskite (FAPbI3)0.85(MAPbBr3)0.15 is explored, and temperature‐dependent X‐ray diffraction measurements that are correlated with steady state and time‐resolved photoluminescence data are presented. The measurements indicate that this material adopts a pseudocubic perovskite α phase at room temperature, with a transition to a pseudotetragonal β phase occurring at ≈260 K. It is found that the temperature dependence of the radiative recombination rates correlates with temperature‐dependent changes in the structural configuration, and observed phase transitions also mark changes in the gradient of the optical bandgap. The work illustrates that temperature‐dependent changes in the perovskite crystal structure alter the charge carrier recombination processes and photoluminescence properties within such hybrid organic–inorganic materials. The findings have significant implications for photovoltaic performance at different operating temperatures, as well as providing new insight on the effect of alloying cations and halides on the phase behavior of hybrid perovskite materials.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. This is an author-produced version of a paper subsequently published in Advanced Energy Materials. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | charge recombination; crystal structure; hybrid perovskite solar cells; photoluminescence |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) |
Funding Information: | Funder Grant number ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/M025330/1 Science and Technology Facilities Council ST/R002754/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 28 Feb 2020 15:02 |
Last Modified: | 24 May 2024 10:27 |
Status: | Published |
Publisher: | Wiley |
Refereed: | Yes |
Identification Number: | 10.1002/aenm.201901350 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:157795 |