Synthesis of SOT-OH and its application as a building block for the synthesis of new dimeric and trimeric Spiro-OMeTAD materials

Cariello, M. , Pant, N., Harkiss, A. H., Tracey, F. M., Cameron, J. , Skabara, P. J. , Holliman, P. J., Docampo, P. and Cooke, G. (2022) Synthesis of SOT-OH and its application as a building block for the synthesis of new dimeric and trimeric Spiro-OMeTAD materials. Molecular Systems Design and Engineering, 7(8), pp. 899-905. (doi: 10.1039/D2ME00038E)

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Abstract

Spiro-OMeTAD has become a ubiquitous hole-transporting material (HTM) in perovskite-based solar cells. However, it has several intrinsic drawbacks including its long-term stability, low conductivity and hole-mobility. Hence, the synthesis of new derivatives with improved charge transporting properties remains an important goal. Here, we have devised a novel synthetic route to prepare unsymmetrically functionalised Spiro-OMeTAD derivatives. We report the synthesis of a mono-demethylated Spiro-OMeTAD derivative, SOT-OH, utilising two different synthetic protocols and show two new derivatives, a dimer (SOT-D) and a trimer (SOT-T) as exemplars. We fully characterise the developed materials and show significantly higher conductivity values than Spiro-OMeTAD when doped with standard ionic salts at the same concentrations. The solar cells fabricated using the mixed composition Cs0.05(FA0.85MA0.15)0.95PbI3 perovskite and the novel SOT-D show power conversion efficiencies of up to 16.4% under standard AM1.5 illumination compared to 16.1% observed when using the benchmark Spiro-OMeTAD.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Docampo, Dr Pablo and Cameron, Dr Joseph and Pant, Dr Namrata and Cooke, Professor Graeme and Skabara, Professor Peter and Harkiss, Dr Alexander and Cariello, Dr Michele and Tracey, Frances
Authors: Cariello, M., Pant, N., Harkiss, A. H., Tracey, F. M., Cameron, J., Skabara, P. J., Holliman, P. J., Docampo, P., and Cooke, G.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Molecular Systems Design and Engineering
Publisher:Royal Society of Chemistry
ISSN:2058-9689
ISSN (Online):2058-9689
Published Online:28 April 2022
Copyright Holders:Copyright © 2022 The Royal Society of Chemistry and IChemE
First Published:First published in Molecular Systems Design and Engineering 7(8): 899-905
Publisher Policy:Reproduced under a Creative Commons License

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