Publication
Engineering of inorg.-org. 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 degrdn. 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, electrochem. and photophys. 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%, resp., under std. measurement conditions. These results validate the readily available BTT heteroarom. structure as a valuable core for the design of highly efficient HTMs for the prepn. of PSCs.
Mohammad Khaja Nazeeruddin, Peng Gao, Paramaguru Ganesan
Bin Ding, Xianfu Zhang, Bo Chen, Yan Liu
Christophe Ballif, Aïcha Hessler-Wyser, Antonin Faes, Jacques Levrat, Umang Bhupatrai Desai, Gianluca Cattaneo, Fahradin Mujovi, Matthieu Despeisse