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Isomerism effect on the photovoltaic properties of benzotrithiophene-based hole-transporting materials

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Abstract

Engineering of inorganic–organic lead halide perovskites for photovoltaic applications has experienced significant advances in recent years. However, the use of the relatively expensive spiro-OMeTAD as a hole-transporting material (HTM) poses a challenge due to dopant-induced degradation. Herein we introduce two new three-armed and four-armed HTMs (BTT-4 and BTT-5) based on isomeric forms of benzotrithiophene (BTT). The isomerism impact on the optical, electrochemical and photophysical properties and the photovoltaic performance is systematically investigated. Perovskite solar cells (PSCs) using BTT-4 and BTT-5 as HTMs show remarkable light-to-energy conversion efficiencies of 19.0% and 18.2%, respectively, under standard measurement conditions. These results validate the readily available BTT heteroaromatic structure as a valuable core for the design of highly efficient HTMs for the preparation of PSCs.

Graphical abstract: Isomerism effect on the photovoltaic properties of benzotrithiophene-based hole-transporting materials

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Publication details

The article was received on 31 Jan 2017, accepted on 06 Mar 2017 and first published on 07 Mar 2017


Article type: Paper
DOI: 10.1039/C7TA00997F
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Isomerism effect on the photovoltaic properties of benzotrithiophene-based hole-transporting materials

    I. García-Benito, I. Zimmermann, J. Urieta-Mora, J. Aragó, A. Molina-Ontoria, E. Ortí, N. Martín and M. K. Nazeeruddin, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA00997F

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