In:
Molecular Systems Design & Engineering, Royal Society of Chemistry (RSC), Vol. 7, No. 8 ( 2022), p. 899-905
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 Cs 0.05 (FA 0.85 MA 0.15 ) 0.95 PbI 3 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 .
Type of Medium:
Online Resource
ISSN:
2058-9689
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
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