Статья

End Group Effect of Asymmetric Benzodithiophene‐Based Donor with Liquid‐Crystal State for Small‐Molecule Binary Solar Cell

Yong ZhaoSchool of Materials Science and Engineering Ocean University of China Qingdao 266100 ChinaZiwei HuangSchool of Materials Science and Engineering Ocean University of China Qingdao 266100 ChinaKang XiaoCAS Key Laboratory of Bio‐based Materials Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao 266101 ChinaJifa YuFrontier Institute of Science and Technology State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an 710054 ChinaMinggeng DingSchool of Materials Science and Engineering Ocean University of China Qingdao 266100 ChinaDeyu LiuSchool of Materials Science and Engineering Ocean University of China Qingdao 266100 ChinaGuanghao LuFrontier Institute of Science and Technology State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an 710054 ChinaXichang BaoCAS Key Laboratory of Bio‐based Materials Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao 266101 ChinaLiang YuKey Laboratory of Marine Chemistry Theory and Technology Ministry of Education Ocean University of China Qingdao 266100 ChinaMingliang SunInstitute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 China

2022en

ABI

Аннотация

Liquid-crystal small molecule donor (LC-SMD) is a new type organic semiconductor, which is attractive not only for the easy synthesis and purification, well-defined chemical structures, etc., but also for the LC state that makes the crystallinity and aggregation state of molecules adjustable. Here, one new LC-SMD (a-BTR-H4) is synthesized with 1D alkoxyl and 2D thiophene-alkylthiol side-chained benzo[1,2-b:4,5-b']dithiophene core, trithiophene π-bridge, and 3-(2-ethylhexyl) rhodanine end group. a-BTR-H4 shows low LC transition temperature, 117 °C, however, counterpart material (a-BTR-H5) with the same main structure but 3-ethyl rhodanine terminal group does not show LC properties. Although a-BTR-H4/H5 show similar Ultraviolet-visible absorption spectrum and energy levels, a-BTR-H4 affords relatively high photovoltaic performances due to favorable blend morphology produced by the consistent annealing temperature of Y6-based accepters and liquid crystal temperature of donors. Preliminary results indicate that a-BTR-H4 gains a power conversion efficiency (PCE) of 11.36% for Y6-based devices, which is ascribed to better light harvest as well as balanced carrier generation and transport, while a-BTR-H5 obtains 7.57% PCE. Therefore, some materials with unique nematic LC phase have great application potential in organic electronics, and further work to utilize a-BTR-H4 for high-performance device is underway.

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Идентификаторы

DOI: 10.1002/smll.202205244

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar