Dopant‐free Starlike Molecular Hole Conductor with Ordered Packing for Durable all‐Inorganic Perovskite Solar Cells

Chenghao Duan(Chinese University of Hong Kong), Feilin Zou(State Key Laboratory of Luminescent Materials and Devices), Shiang Li(Chinese University of Hong Kong), Qiliang Zhu(State Key Laboratory of Luminescent Materials and Devices), Jiong Li(State Key Laboratory of Luminescent Materials and Devices), Honggang Chen(State Key Laboratory of Luminescent Materials and Devices), Zheng Zhang(State Key Laboratory of Luminescent Materials and Devices), Chang Chen(State Key Laboratory of Luminescent Materials and Devices), Huan Guo(State Key Laboratory of Luminescent Materials and Devices), Jianhang Qiu(Chinese Academy of Sciences), Ke Wang(State Key Laboratory of Luminescent Materials and Devices), Yuyan Dong(State Key Laboratory of Luminescent Materials and Devices), Yongcai Qiu(State Key Laboratory of Luminescent Materials and Devices), Liming Ding(National Center for Nanoscience and Technology), Xinhui Lu(Chinese University of Hong Kong), Hongze Luo(Council for Scientific and Industrial Research), Keyou Yan(State Key Laboratory of Luminescent Materials and Devices)
Advanced Energy Materials
January 24, 2024
10.1002/aenm.202303997
Cited by 20

Abstract

Abstract All‐inorganic n‐i‐p perovskite solar cells (PSCs) using doped Spiro‐OMeTAD as hole transport material (HTM) suffer from photothermal stability due to ionic diffusion and radical‐induced degradation by the dopants. In this article, dopant‐free starlike molecule (N2, N2‐bis(4‐(bis(4‐methoxyphenyl)amino)phenyl)‐N5,N5‐bis(4‐methoxyphenyl)pyridine‐2,5‐diamine (BD)) is synthesized to engineer the stacking properties and delivered higher hole mobility than doped Spiro‐OMeTAD (3.2 × 10 −4 versus 1.76 × 10 −4 cm 2 V −1 s −1 ) as dopant‐free HTM. Starlike BD HTM has a twisted acceptor unit and strong dipole, forming crystalline and ordered packing film to ensure intramolecular charge transfer and improve mobility. The BD CsPbI 3 PSCs deliver the maximum efficiency of 19.19%, which is the highest performance for all‐inorganic PSCs based on dopant‐free HTMs. Meanwhile, the ordered molecules‐packing blocks the migration channel of I − ions to metal electrodes and improves the device stability. BD‐based devices maintain more than 93% and 80% of the initial efficiency after 85 °C storage for 35 days and maximum power point (MPP) tracking at 85 °C for 1000 h, respectively.

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