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

Michele Cariello Orcid Logo, Namrata Pant Orcid Logo, Alexander H. Harkiss Orcid Logo, Frances M. Tracey Orcid Logo, Joseph Cameron Orcid Logo, Peter J. Skabara Orcid Logo, Peter Holliman Orcid Logo, Pablo Docampo Orcid Logo, Graeme Cooke Orcid Logo

Molecular Systems Design & Engineering, Volume: 7, Issue: 8, Pages: 899 - 905

Swansea University Author: Peter Holliman Orcid Logo

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DOI (Published version): 10.1039/d2me00038e

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 properti...

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Published in: Molecular Systems Design & Engineering
ISSN: 2058-9689
Published: Royal Society of Chemistry (RSC) 2023
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa65194
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.
Keywords: Solar cells
College: Faculty of Science and Engineering
Issue: 8
Start Page: 899
End Page: 905

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