Westbrook, RJE;
Macdonald, TJ;
Xu, W;
Lanzetta, L;
Marin-Beloqui, JM;
Clarke, TM;
Haque, SA;
(2021)
Lewis Base Passivation Mediates Charge Transfer at Perovskite Heterojunctions.
Journal of the American Chemical Society
, 143
(31)
pp. 12230-12243.
10.1021/jacs.1c05122.
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Abstract
Understanding interfacial charge transfer processes such as trap-mediated recombination and injection into charge transport layers (CTLs) is crucial for the improvement of perovskite solar cells. Herein, we reveal that the chemical binding of charge transport layers to CH3NH3PbI3 defect sites is an integral part of the interfacial charge injection mechanism in both n-i-p and p-i-n architectures. Specifically, we use a mixture of optical and X-ray photoelectron spectroscopy to show that binding interactions occur via Lewis base interactions between electron-donating moieties on hole transport layers and the CH3NH3PbI3 surface. We then correlate the extent of binding with an improvement in the yield and longer lifetime of injected holes with transient absorption spectroscopy. Our results show that passivation-mediated charge transfer has been occurring undetected in some of the most common perovskite configurations and elucidate a key design rule for the chemical structure of next-generation CTLs.
Type: | Article |
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Title: | Lewis Base Passivation Mediates Charge Transfer at Perovskite Heterojunctions |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1021/jacs.1c05122 |
Publisher version: | https://doi.org/10.1021/jacs.1c05122 |
Language: | English |
Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
Keywords: | Passivation, Interfaces, Organic polymers, Layers, Recombination |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10135137 |
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