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Lewis Base Passivation Mediates Charge Transfer at Perovskite Heterojunctions

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. Green open access

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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
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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