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Tin perovskite/fullerene planar layer photovoltaics : improving the efficiency and stability of lead-free devices
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Marshall, Kenneth P., Walton, Richard I. and Hatton, Ross A. (2015) Tin perovskite/fullerene planar layer photovoltaics : improving the efficiency and stability of lead-free devices. Journal of Materials Chemistry A, 3 . pp. 11631-11640. doi:10.1039/c5ta02950c ISSN 2050-7488.
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Official URL: http://dx.doi.org/10.1039/c5ta02950c
Abstract
We report the first demonstration of orthorhombic CsSnI3 films prepared from solution at room temperature that have defect densities low enough for use as the light harvesting semiconductor in photovoltaic devices even without using excess Sn in the preparative method, and demonstrate their utility in a model p–i–n photovoltaic device based on a CuI | CsSnI3 | fullerene planar layer architecture. We also report an effective strategy for simultaneously improving both the efficiency and stability of these devices towards air exposure based on the use of excess of SnI2 during CsSnI3 synthesis from CsI and SnI2. A combination of photoelectron spectroscopy, contact potential measurements and device based studies are used to elucidate the basis for this improvement and role of the excess SnI2. The open-circuit voltage in these lead-free photovoltaic devices is shown to be strongly dependent on the degree of alignment between the perovskite conduction band edge and the lowest occupied molecular orbital (LUMO) in the fullerene electron transport layer. Furthermore, the energetics at the perovskite–fullerene interface are shown to be a function both of the LUMO energy of the fullerene and the nature of the interaction at the heterojunction which can give rise to a large abrupt vacuum level shift across the interface. A champion open-circuit voltage of ∼0.55 V is achieved using indene-C60 bis-adduct as the electron extraction layer, which is twice that previously reported for a CsSnI3 based PPV.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||||||
Library of Congress Subject Headings (LCSH): | Photovoltaic power generation | ||||||||
Journal or Publication Title: | Journal of Materials Chemistry A | ||||||||
Publisher: | R S C Publications | ||||||||
ISSN: | 2050-7488 | ||||||||
Official Date: | 29 April 2015 | ||||||||
Dates: |
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Volume: | 3 | ||||||||
Number of Pages: | 10 | ||||||||
Page Range: | pp. 11631-11640 | ||||||||
DOI: | 10.1039/c5ta02950c | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||
Date of first compliant deposit: | 2 June 2016 | ||||||||
Date of first compliant Open Access: | 6 June 2016 | ||||||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC), European Regional Development Fund (ERDF), Birmingham Science City | ||||||||
Grant number: | 0906159, EP/L505110/1 (EPSRC) |
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