Synthesis of spirodithienogermole with triphenylamine units as a dopant-free hole-transporting material for perovskite solar cells

Spiro-condensed dithienogermoles with electron-donating aromatic substituents were prepared by Pd-catalyzed Stille coupling reactions of spirobi(dibromodithienogermole) and the corresponding trimethylstannylarene derivatives. Their optical and electrochemical properties were examined in comparison w...

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Published inJournal of materials chemistry. C, Materials for optical and electronic devices Vol. 9; no. 6; pp. 21 - 27
Main Authors Ohshita, Joji, Kondo, Keisuke, Adachi, Yohei, Song, Myungkwan, Jin, Sung-Ho
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 23.02.2021
Subjects
Chemical reactions
Conjugation
Electrochemical analysis
Molecular orbitals
NMR
Nuclear magnetic resonance
Optical properties
Perovskites
Photovoltaic cells
Solar cells
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Summary:Spiro-condensed dithienogermoles with electron-donating aromatic substituents were prepared by Pd-catalyzed Stille coupling reactions of spirobi(dibromodithienogermole) and the corresponding trimethylstannylarene derivatives. Their optical and electrochemical properties were examined in comparison with those of related model compounds without the germole ring systems and the spiro-condensed unit, indicating that the spiro-condensed dithiengermole systems play roles in the enhancement of the conjugation. Perovskite solar cells (PSCs) were fabricated using triphenylamine-containing spirobi(dithienogermole) ( sDTG-tpa ) as the hole-transporting material (HTM). The PSCs showed the maximal photo-current conversion efficiency of 14.67%, which was higher than that of a similar device with spiro-OMeTAD as the HTM (9.53%), indicating the superior performance of sDTG-tpa as HTM compared with spiro-OMeTAD , a typical HTM for PSCs. Spiro-condensed dithienogermoles with electron-donating aromatic substituents were prepared, one of which was examined as the hole-transporting material of perovskite solar cell, providing the maximal photo-current conversion efficiency of 14.67%.
Bibliography:Electronic supplementary information (ESI) available: NMR spectra and CVs of the presently prepared compounds, simulated HOMO and LUMO profiles of
sDTG-tpa
10.1039/d0tc04905k
See DOI
and optimized geometry of
ISSN:2050-7526
2050-7534
DOI:10.1039/d0tc04905k