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Electronic Properties of Meso-Superstructured and Planar Organometal Halide Perovskite Films: Charge Trapping, Photodoping, and Carrier Mobility
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
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2014 (English)In: ACS Nano, ISSN 1936-0851, E-ISSN 1936-086X, Vol. 8, no 7, p. 7147-7155Article in journal (Refereed) Published
Abstract [en]

Solution-processed organometal trihalide perovskite solar cells are attracting increasing interest, leading to high performances over 15% in thin film architectures. Here, we probe the presence of sub gap states in both solid and mesosuperstructured perovskite films and determine that they strongly influence the photoconductivity response and splitting of the quasi-Fermi levels in films and solar cells. We find that while the planar perovskite films are superior to the mesosuperstructured films in terms of charge carrier mobility (in excess of 20 cm(2) V-1 s(-1)) and emissivity, the planar heterojunction solar cells are limited in photovoltage by the presence of sub gap states and low intrinsic doping densities.

Place, publisher, year, edition, pages
2014. Vol. 8, no 7, p. 7147-7155
Keywords [en]
perovskite, solar cells, mobility, traps, doping
National Category
Physical Sciences Chemical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-231126DOI: 10.1021/nn502115kISI: 000339463100070OAI: oai:DiVA.org:uu-231126DiVA, id: diva2:743614
Available from: 2014-09-04 Created: 2014-09-04 Last updated: 2017-12-05Bibliographically approved

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Lindblad, RebeckaJohansson, Erik M. J.Rensmo, Hakan

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