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Attaining the durability of high-efficiency perovskite solar cells (PSCs) operated under concomitant light and thermal stresses is still a serious concern before large-scale application. It is crucial to maintain the phase stability of the organic hole-transporting layer for thermostable PSCs across a range of temperatures sampled during device operation. To address this issue, we propose a racemic semiconducting glassy film with remarkable morphological stability, exemplified here by a low-molecular symmetry oxa[5]helicene-centered organic semiconductor (O5H-OMeDPA). The helical configuration of O5H-OMeDPA confers the trait of multiple-dimension charge transfer to the solid, resulting in high hole mobility of 6.7 × 10−4 cm2 V−1 s−1 of a solution-processed glassy film. O5H-OMeDPA is combined with a triple-cation dual-halide lead perovskite to fabricate PSCs with power conversion efficiencies of 21.03 …
Publication date: 
31 May 2019

Niansheng Xu, Yang Li, Damiano Ricciarelli, Jianan Wang, Edoardo Mosconi, Yi Yuan, Filippo De Angelis, Shaik M Zakeeruddin, Michael Grätzel, Peng Wang

Biblio References: 
Volume: 15 Pages: 234-242