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Photoinduced Stark Effects and Mechanism of Ion Displacement in Perovskite Solar Cell Materials
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry. Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Swiss Fed Inst Technol, Dept Chem & Chem Engn, Lab Photomol Sci, Stn 6, CH-1015 Lausanne, Switzerland..
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.
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2017 (English)In: ACS Nano, ISSN 1936-0851, E-ISSN 1936-086X, Vol. 11, no 3, p. 2823-2834Article in journal (Refereed) Published
Abstract [en]

Organometallic halide perovskites (OMHPs) have recently emerged as a promising class of materials in photovoltaic technology. Here, we present an in-depth investigation of the physics in these systems by measuring the photoinduced absorption (PIA) in OMHPs as a function of materials composition, excitation wavelength, and modulation frequency. We report a photoinduced Stark effect that depends on the excitation wavelength and on the dipole strength of the monovalent cations in the A position of the ABX(3) perovskite. The results presented are corroborated by density functional theory calculations and provide fundamental information about the photoinduced local electric field change under blue and red excitation as well as insights into the mechanism of light induced ion displacement in OMHPs. For optimized perovskite solar cell devices beyond 19% efficiency, we show that excess thermalization energy of blue photons plays a role in overcoming the activation energy for ion diffusion.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2017. Vol. 11, no 3, p. 2823-2834
Keywords [en]
Stark effect, photoinduced ion migration, perovskite solar cells, CH3NH3PbI3, mixed halide perovskites, cation-dependent ion movement
National Category
Chemical Sciences Nano Technology Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-320827DOI: 10.1021/acsnano.6b07916ISI: 000398014900049PubMedID: 28240871OAI: oai:DiVA.org:uu-320827DiVA, id: diva2:1091470
Funder
Swedish Energy AgencySwedish Research CouncilStandUpAvailable from: 2017-04-26 Created: 2017-04-26 Last updated: 2017-04-28Bibliographically approved

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Pazoki, MeysamKullgren, JollaJohansson, Erik M. J.Boschloo, GerritEdvinsson, Tomas

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