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dc.contributor.authorHolovský, Jakub
dc.contributor.authorDe Wolf, Stefaan
dc.contributor.authorWerner, Jérémie
dc.contributor.authorRemeš, Zdeněk
dc.contributor.authorMüller, Martin
dc.contributor.authorNeykova, Neda
dc.contributor.authorLedinský, Martin
dc.contributor.authorČerná, Ladislava
dc.contributor.authorHrzina, Pavel
dc.contributor.authorLöper, Philipp
dc.contributor.authorNiesen, Bjoern
dc.contributor.authorBallif, Christophe
dc.date.accessioned2017-05-31T11:23:11Z
dc.date.available2017-05-31T11:23:11Z
dc.date.issued2017-02-06
dc.identifier.citationHolovský J, De Wolf S, Werner J, Remeš Z, Müller M, et al. (2017) Photocurrent Spectroscopy of Perovskite Layers and Solar Cells: A Sensitive Probe of Material Degradation. The Journal of Physical Chemistry Letters 8: 838–843. Available: http://dx.doi.org/10.1021/acs.jpclett.6b02854.
dc.identifier.issn1948-7185
dc.identifier.doi10.1021/acs.jpclett.6b02854
dc.identifier.urihttp://hdl.handle.net/10754/623888
dc.description.abstractOptical absorptance spectroscopy of polycrystalline CHNHPbI films usually indicates the presence of a PbI phase, either as a preparation residue or due to film degradation, but gives no insight on how this may affect electrical properties. Here, we apply photocurrent spectroscopy to both perovskite solar cells and coplanar-contacted layers at various stages of degradation. In both cases, we find that the presence of a PbI phase restricts charge-carrier transport, suggesting that PbI encapsulates CHNHPbI grains. We also find that PbI injects holes into the CHNHPbI grains, increasing the apparent photosensitivity of PbI. This phenomenon, known as modulation doping, is absent in the photocurrent spectra of solar cells, where holes and electrons have to be collected in pairs. This interpretation provides insights into the photogeneration and carrier transport in dual-phase perovskites.
dc.description.sponsorshipThe authors acknowledge financial support from Czech Science Foundation Project No. 17-26041Y, the Project KONNECT- 007 of the Czech Academy of Sciences, the Czech Ministry of Education, Youth and Sports Projects LM2015087 and CZ.02.1.01/0.0/0.0/15_003/0000464 Centre of Advanced Photovoltaics, and the Swiss National Science Foundation through Nanotera and PNR 70 program. We thank Prof. Roman Grill and Dr. Thomas Dittrich for fruitful discussions.
dc.publisherAmerican Chemical Society (ACS)
dc.relation.urlhttp://pubs.acs.org/doi/abs/10.1021/acs.jpclett.6b02854
dc.titlePhotocurrent Spectroscopy of Perovskite Layers and Solar Cells: A Sensitive Probe of Material Degradation
dc.typeArticle
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentMaterial Science and Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalThe Journal of Physical Chemistry Letters
dc.contributor.institutionInstitute of Physics, Czech Academy of Sciences, V. V. I., Cukrovarnická 10, Prague, 162 00, Czech Republic
dc.contributor.institutionFaculty of Electrical Engineering, Czech Technical University in Prague, Technická 2, Prague, 166 27, Czech Republic
dc.contributor.institutionPhotovoltaics and Thin-Film Electronics Laboratory, Institute of Microengineering (IMT), École Polytechnique Fédérale de Lausanne (EPFL), Rue de la Maladière 71b, Neuchâtel, 2000, Switzerland
kaust.personDe Wolf, Stefaan
dc.date.published-online2017-02-06
dc.date.published-print2017-02-16


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