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Effect of halide ratio and Cs+ addition on the photochemical stability of lead halide perovskites
Uppsala Univ, Dept Phys & Astron, Div Mol & Condensed Matter Phys, Box 516, SE-75120 Uppsala, Sweden..
Uppsala Univ, Dept Chem, Angstrom Lab, Box 538, S-75121 Uppsala, Sweden..
KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemi, Tillämpad fysikalisk kemi.
Helmholtz Zentrum Berlin GmbH, Inst Methods & Instrumentat Synchrotron Radiat Re, Albert Einstein Str 15, D-12489 Berlin, Germany..
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2018 (engelsk)Inngår i: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 6, nr 44, s. 22134-22144Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Lead halide perovskite solar cells with multi-cation/mixed halide materials now give power conversion efficiencies of more than 20%. The stability of these mixed materials has been significantly improved through the addition of Cs+ compared to the original methylammonium lead iodide. However, it remains one of the most significant challenges for commercialisation. In this study, we use photoelectron spectroscopy (PES) in combination with visible laser illumination to study the photo-stability of perovskite films with different compositions. These include Br : I ratios of 50 : 50 and 17 : 83 and compositions with and without Cs+. For the samples without Cs and the 50 : 50 samples, we found that the surface was enriched in Br and depleted in I during illumination and that some of the perovskite decomposed into Pb-0, organic halide salts, and iodine. After illumination, both of these reactions were partially reversible. Furthermore, the surfaces of the films were enriched in organic halide salts indicating that the cations were not degraded into volatile products. With the addition of Cs+ to the samples, photo-induced changes were significantly suppressed for a 50 : 50 bromide to iodide ratio and completely suppressed for perovskites with a 17 : 83 ratio at light intensities exceeding 1 sun equivalent.

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ROYAL SOC CHEMISTRY , 2018. Vol. 6, nr 44, s. 22134-22144
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URN: urn:nbn:se:kth:diva-243971DOI: 10.1039/c8ta05795hISI: 000456724800044Scopus ID: 2-s2.0-85054176779OAI: oai:DiVA.org:kth-243971DiVA, id: diva2:1292996
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QC 20190301

Tilgjengelig fra: 2019-03-01 Laget: 2019-03-01 Sist oppdatert: 2019-03-18bibliografisk kontrollert

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Cappel, Ute B.

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