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In Situ Self-Assembly of Trichlorobenzoic Acid Enabling Organic Photovoltaics with Approaching 19% Efficiency
He, Wei1; Li, Hongxiang1; Ma, Ruijie2; Yan, Xue1; Yu, Hailin1; Hu, Yingyue1; Hu, Dingqin3; Qin, Jiaqiang1; Cui, Ningbo4,5; Wang, Jiayu1
2023-12-21
摘要Future industrialization of organic photovoltaics (OPVs) requires OPVs' processing to be more energy-efficient and streamlined. Currently, only MoO3 and PEDOT:PSS are commonly used as the anode interface layer (AIL). The processing of MoO3 typically involves vacuum thermal evaporation with stringent thickness requirements. PEDOT:PSS necessitates separate processing and thermal annealing at temperatures exceeding 100 degrees C to eliminate moisture. This work utilized 3,4,5-trichlorobenzoic acid (3CBA) as the AIL material. The distinct advantage of 3CBA over PEDOT:PSS and MoO3 is the in situ self-assembly of 3CBA eliminates the need for separate solution processing, thermal evaporation, or thermal annealing. Remarkably, OPV devices incorporating PM6, BTP-eC9, and the 3CBA AIL exhibited a superior efficiency of 18.2% compared to those with PEDOT:PSS (17.7%). By using nonhalogenated solvent, o-xylene, to meet industrialization requirements, the devices achieved an exceptional efficiency of 18.8%, the highest reported value among devices with in situ self-assembled interface layers. Furthermore, semi-transparent devices with 3CBA displayed higher PCE and AVT values (13.1% and 25.7%) than their PEDOT: PSS counterparts, due to the weak absorption of the 3CBA AIL. This work contributes significantly to the high-throughput production of OPVs by streamlining the AIL processing. 3,4,5-trichlorobenzoic acid is first reported as the anode interfacial layer material, which can be facilely processed by air-blading (without annealing) and in situ self-assembly. Organic photovoltaics devices based on PM6: BTP-eC9 achieve an impressively high efficiency of 18.8% with in situ self-assembled 3,4,5-trichlorobenzoic acid anode interfacial layer, representing the highest value among devices with in situ self-assembly anode interfacial layer.image
关键词air-blading anode interface layer in situ self-assembly organic photovoltaics trifluorobenzoic acid
DOI10.1002/adfm.202313594
发表期刊ADVANCED FUNCTIONAL MATERIALS
ISSN1616-301X
页码8
通讯作者Yan, Cenqi(yancenqi@scu.edu.cn) ; Cheng, Pei(chengpei@scu.edu.cn)
收录类别SCI
WOS记录号WOS:001128445000001
语种英语