%0 Journal Article
%A García Benito, Inés
%A Zimmermann, Iwan
%A Urieta Mora, Javier
%A Aragó, Juan
%A Molina Ontoria, Agustín
%A Ortí, Enrique
%A Martín León, Nazario
%A Nazeeruddin, Mohammad Khaja
%T Isomerism effect on the photovoltaic properties of benzotrithiophene-based hole-transporting materials
%D 2017
%@ 2050-7488
%@ 2050-7496
%U https://hdl.handle.net/20.500.14352/115891
%X 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.
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