A N-Ethylcarbazole-Terminated Spiro-Type Hole-Transporting Material for Efficient and Stable Perovskite Solar Cells

Mingyuan Han; Yongpeng Liang; Jianlin Chen; Xianfu Zhang; Rahim Ghadari; Xuepeng Liu; Nan Wu; Ying Wang; Ying Zhou; Yong Ding; Molang Cai; Haibin Chen; Songyuan Dai

doi:10.1002/cssc.202201485

A N-Ethylcarbazole-Terminated Spiro-Type Hole-Transporting Material for Efficient and Stable Perovskite Solar Cells

ChemSusChem. 2022 Oct 21;15(20):e202201485. doi: 10.1002/cssc.202201485. Epub 2022 Sep 19.

Authors

Affiliations

¹ School of New Energy, North China Electric Power University, Beijing, 102206, P. R. China.
² Computational Chemistry Laboratory, Department, of Organic and Biochemistry, Faculty of Chemistry, University of Tabriz, Tabriz, 5166616471, Iran.
³ National-Local Joint Engineering Laboratory of New Energy Photoelectric Devices, Hebei University, Baoding, 071000, P. R. China.

PMID: 36036864
DOI: 10.1002/cssc.202201485

Abstract

The development of stable and efficient hole-transporting materials (HTMs) is critical for the commercialization of perovskite solar cells (PSCs). Herein, a novel spiro-type HTM was designed and synthesized where N-ethylcarbazole-terminated groups fully substituted the methoxy group of spiro-OMeTAD, named spiro-carbazole. The developed molecule exhibited a lower highest occupied molecular orbital level, higher hole mobility, and extremely high glass transition temperature (T_g =196 °C) compared with spiro-OMeTAD. PSCs with the developed molecule exhibited a champion power conversion efficiency (PCE) of 22.01 %, which surpassed traditional spiro-OMeTAD (21.12 %). Importantly, the spiro-carbazole-based device had dramatically better thermal, humid, and long-term stability than spiro-OMeTAD.

Keywords: N-ethylcarbazole; hole-transporting materials; perovskite solar cells; photovoltaics; stability.

Abstract

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