Ute B. Cappel, Sebastian Svanstrom, Valeria Lanzilotto, Fredrik O. L. Johansson, Kerttu Aitola, Bertrand Philippe, Erika Giangrisostomi, Ruslan Ovsyannikov, Torsten Leitner, Alexander Föhlisch, Svante Svensson, Nils Martensson, Gerrit Boschloo, Andreas Lindblad, Hakan Rensmo
- Metal halide perovskites have emerged as materials of high interest for solar energy-to-electricity conversion, and in particular, the use of mixed-ion structures has led to high power conversion efficiencies and improved stability. For this reason, it is important to develop means to obtain atomic level understanding of the photoinduced behavior of these materials including processes such as photoinduced phase separation and ion migration. In this paper, we implement a new methodology combining visible laser illumination of a mixed-ion perovskite ((FAP-bI(3))(0.85)(MAPbBr(3))(0.15)) with the element specificity and chemical sensitivity of core-level photoelectron spectroscopy. By carrying out measurements at a synchrotron beamline optimized for low X-ray fluxes, we are able to avoid sample changes due to X-ray illumination and are therefore able to monitor what sample changes are induced by visible illumination only. We find that laser illumination causes partially reversible chemistry in the surface region, including enrichment ofMetal halide perovskites have emerged as materials of high interest for solar energy-to-electricity conversion, and in particular, the use of mixed-ion structures has led to high power conversion efficiencies and improved stability. For this reason, it is important to develop means to obtain atomic level understanding of the photoinduced behavior of these materials including processes such as photoinduced phase separation and ion migration. In this paper, we implement a new methodology combining visible laser illumination of a mixed-ion perovskite ((FAP-bI(3))(0.85)(MAPbBr(3))(0.15)) with the element specificity and chemical sensitivity of core-level photoelectron spectroscopy. By carrying out measurements at a synchrotron beamline optimized for low X-ray fluxes, we are able to avoid sample changes due to X-ray illumination and are therefore able to monitor what sample changes are induced by visible illumination only. We find that laser illumination causes partially reversible chemistry in the surface region, including enrichment of bromide at the surface, which could be related to a phase separation into bromide- and iodide-rich phases. We also observe a partially reversible formation of metallic lead in the perovskite structure. These processes occur on the time scale of minutes during illumination. The presented methodology has a large potential for understanding light-induced chemistry in photoactive materials and could specifically be extended to systematically study the impact of morphology and composition on the photostability of metal halide perovskites.…
MetadatenAuthor details: | Ute B. Cappel, Sebastian Svanstrom, Valeria Lanzilotto, Fredrik O. L. Johansson, Kerttu Aitola, Bertrand Philippe, Erika GiangrisostomiORCiD, Ruslan Ovsyannikov, Torsten Leitner, Alexander FöhlischORCiDGND, Svante SvenssonORCiD, Nils Martensson, Gerrit BoschlooORCiD, Andreas LindbladORCiD, Hakan Rensmo |
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DOI: | https://doi.org/10.1021/acsami.7b10643 |
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ISSN: | 1944-8244 |
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Pubmed ID: | https://pubmed.ncbi.nlm.nih.gov/28925263 |
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Title of parent work (English): | ACS applied materials & interfaces |
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Publisher: | American Chemical Society |
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Place of publishing: | Washington |
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Publication type: | Article |
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Language: | English |
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Year of first publication: | 2017 |
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Publication year: | 2017 |
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Release date: | 2020/04/20 |
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Tag: | ion migration; laser illumination; lead halide perovskite; phase separation; photoelectron spectroscopy; stability |
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Volume: | 9 |
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Number of pages: | 9 |
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First page: | 34970 |
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Last Page: | 34978 |
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Funding institution: | Programme/ERC [321319]; Swedish Research Council [2014-6019, 2014-6463]; Carl Tryggers Foundation for scientific research (CTH); Aforsk Foundation; STandUP for Energy program; Solar-era.net project "CNT-PV"; Swedish Strategic Research Council (SSF) [RMA15-0130]; Marie Sklodowska-Curie Actions [INCA 600398] |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
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Peer review: | Referiert |
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