Tin(iv) dopant removal through anti-solvent engineering enabling tin based perovskite solar cells with high charge carrier mobilities
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Bandara, R. M. I., Jayawardena, K. D. G. I., Adeyemo, S. O., Hinder, S. J., Smith, J. A., Thirimanne, H. M., Wong, N. C., Amin, F. M., Freestone, B. G., Parnell, A. J. , Lidzey, D. G., Joyce, H. J., Sporea, R. A. and Silva, S. R. P. (2019) Tin(iv) dopant removal through anti-solvent engineering enabling tin based perovskite solar cells with high charge carrier mobilities Journal of Materials Chemistry C.
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Tin(IV) dopant removal.pdf - Version of Record Available under License Creative Commons Attribution Non-commercial. Download (3MB) | Preview |
Official URL: https://doi.org/10.1039/C9TC02003A
Abstract
We report the need for careful selection of anti-solvents for Sn-based perovskite solar cells fabricated through the commonly used anti-solvent method, compared to their Pb-based counterparts. This, in combination with the film processing conditions used, enables the complete removal of unwanted Sn4+ dopants, through engineering the anti-solvent method for Sn-based perovskites. Using a Cs0.05(FA0.83MA0.17)0.95Pb0.5Sn0.5I3 perovskite, charge carrier mobilities of 32 ± 3 cm2 V−1 s−1 (the highest reported for such systems through the optical-pump terahertz probe technique) together with ∼28 mA cm−2 short circuit current densities are achieved. A champion efficiency of 11.6% was obtained for solvent extraction using toluene (an 80% enhancement in efficiency compared to the other anti-solvents) which is further improved to 12.04% following optimised anti-solvent wash and thermal treatment. Our work highlights the importance of anti-solvents in managing defects for high efficiency low bandgap perovskite materials and develops the potential for all-perovskite tandem solar cells.
| Item Type: | Article | |||||||||||||||||||||||||||||||||||||||||||||
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| Divisions : | Faculty of Engineering and Physical Sciences > Electronic Engineering | |||||||||||||||||||||||||||||||||||||||||||||
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| Date : | 25 June 2019 | |||||||||||||||||||||||||||||||||||||||||||||
| Funders : | Engineering and Physical Sciences Research Council (EPSRC), European Commission H2020, University of Surrey, European Research Council (ERC) | |||||||||||||||||||||||||||||||||||||||||||||
| DOI : | 10.1039/C9TC02003A | |||||||||||||||||||||||||||||||||||||||||||||
| Copyright Disclaimer : | © The Royal Society of Chemistry 2019. This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. | |||||||||||||||||||||||||||||||||||||||||||||
| Depositing User : | Clive Harris | |||||||||||||||||||||||||||||||||||||||||||||
| Date Deposited : | 01 Jul 2019 08:32 | |||||||||||||||||||||||||||||||||||||||||||||
| Last Modified : | 01 Jul 2019 11:05 | |||||||||||||||||||||||||||||||||||||||||||||
| URI: | http://epubs.surrey.ac.uk/id/eprint/852184 |
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