An Oxa[5]helicene-Based Racemic Semiconducting Glassy Film for Photothermally Stable Perovskite Solar Cells
Niansheng Xu,
Yang Li,
Damiano Ricciarelli,
Jianan Wang,
Edoardo Mosconi,
Yi Yuan,
Filippo De Angelis,
Shaik M. Zakeeruddin,
Michael Grätzel,
Peng Wang
Affiliations
Niansheng Xu
Department of Chemistry, Zhejiang University, Hangzhou 310028, China
Yang Li
Department of Chemistry, Zhejiang University, Hangzhou 310028, China; Laboratory of Photonics and Interfaces, Institute of Chemical Sciences & Engineering, École Polytechnique Fédérale de Lausanne, Lausanne 1015, Switzerland
Damiano Ricciarelli
Department of Chemistry, Biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy; Computational Laboratory for Hybrid/Organic Photovoltaics, CNR-ISTM, Via Elce di Sotto 8, 06123 Perugia, Italy
Jianan Wang
Department of Chemistry, Zhejiang University, Hangzhou 310028, China
Edoardo Mosconi
Department of Chemistry, Biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
Yi Yuan
Department of Chemistry, Zhejiang University, Hangzhou 310028, China
Filippo De Angelis
Department of Chemistry, Biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy; Computational Laboratory for Hybrid/Organic Photovoltaics, CNR-ISTM, Via Elce di Sotto 8, 06123 Perugia, Italy; D3-Computation, Istituto Italiano di Tecnologia, Via Morego, Genova, Italy; Corresponding author
Shaik M. Zakeeruddin
Laboratory of Photonics and Interfaces, Institute of Chemical Sciences & Engineering, École Polytechnique Fédérale de Lausanne, Lausanne 1015, Switzerland
Michael Grätzel
Laboratory of Photonics and Interfaces, Institute of Chemical Sciences & Engineering, École Polytechnique Fédérale de Lausanne, Lausanne 1015, Switzerland
Peng Wang
Department of Chemistry, Zhejiang University, Hangzhou 310028, China; Corresponding author
Summary: 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%, outperforming the control cells with spiro-OMeTAD (20.44%). Moreover, the cells using O5H-OMeDPA exhibit good long-term stability during full-sunlight soaking at 60°C. : Chemistry; Materials Science; Surface Science; Energy Materials Subject Areas: Chemistry, Materials Science, Surface Science, Energy Materials
