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Photon Energy-Dependent Hysteresis Effects in Lead Halide Perovskite 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.ORCID iD: 0000-0001-6776-5460
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.
Ecole Polytech Fed Lausanne, Inst Chem Sci & Engn, Lab Photomol Sci, CH-1015 Lausanne, Switzerland.; Benemerita Univ Autonoma Puebla, CIDS, Ave San Claudio & 18 Sur,Ciudad Univ,POB 1067, Puebla 72570, Mexico.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.
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2017 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 121, no 47, p. 26180-26187Article in journal (Refereed) Published
Abstract [en]

Lead halide perovskites have a range of spectacular properties and interesting phenomena and are a serious candidate for the next generation of photovoltaics with high efficiencies and low fabrication costs. An interesting phenomenon is the anomalous hysteresis often seen in current-voltage scans, which complicates accurate performance measurements but has also been explored to obtain a more comprehensive understanding of the device physics. Herein, we demonstrate a wavelength and illumination intensity dependency of the hysteresis in state-of-the-art perovskite solar cells with 18% power conversion efficiency (PCE), which gives new insights into ion migration. The perovskite devices show lower hysteresis under illumination with near band edge (red) wavelengths compared to more energetic (blue) excitation. This can be rationalized with thermalization-assisted ion movement or thermalization-assisted vacancy generation. These explanations are supported by the dependency of the photovoltage decay with illumination time and excitation wavelength, as well as by impedance spectroscopy. The suggested mechanism is that high-energy photons create hot charge carriers that either through thermalization can create additional vacancies or by release of more energetic phonons play a role in overcoming the activation energy for ion movement. The excitation wavelength dependency of the hysteresis presented here gives valuable insights into the photophysics of the lead halide perovskite solar cells.

Place, publisher, year, edition, pages
2017. Vol. 121, no 47, p. 26180-26187
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Physical Chemistry Engineering and Technology
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URN: urn:nbn:se:uu:diva-334350DOI: 10.1021/acs.jpcc.7b06775ISI: 000417228500005OAI: oai:DiVA.org:uu-334350DiVA, id: diva2:1159298
Funder
ÅForsk (Ångpanneföreningen's Foundation for Research and Development), 43294-1StandUpAvailable from: 2017-11-22 Created: 2017-11-22 Last updated: 2018-03-08Bibliographically approved

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Pazoki, MeysamJacobsson, Jesper T.Johansson, Malin B.Imani, RoghayehKullgren, JollaHagfeldt, AndersJohansson, Erik M. J.Edvinsson, TomasBoschloo, Gerrit
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