期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 8, 期 20, 页码 10318-10330出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta00947d
关键词
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资金
- National Research Foundation (NRF) [NRF-2015M1A2A2056214, 2015M1A2A2055631, 2015R1A1A3A04001498, 2019R1A2C1003679]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) of the Republic of Korea [20173010012960, 20183010013820]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20173010012960, 20183010013820] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2015M1A2A2055631, 2019R1A2C1003679, 2015R1A1A3A04001498, 2015M1A2A2056214] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Solution processability is one of the advantages of organic solar cells (OSCs). However, most high-efficiency OSCs are prepared using hazardous chlorinated solvents for the deposition of photoactive layers. The replacement of non-halogenated solvents with eco-friendly green solvents for photoactive materials is urgently required. Herein, we have developed a novel asymmetric T2-OEHRH, which is modified from the symmetric T2-ORH. The introduction of asymmetric alkyl side chains onto rhodanine end groups can effectively suppress excessive self-aggregation/crystallization and substantially improve solubility without sacrificing optoelectrical properties. Therefore, ternary-blend OSCs based on PTB7-Th:EH-IDTBR:T2-OEHRH processed using a non-halogenated solvent system exhibit a uniform and favorable morphology and give a high power conversion efficiency (PCE) of 12.10%. More importantly, we demonstrate an impressive PCE of 9.32% for large-area NFA-OSCs (substrate size = 100 cm(2) and aperture size = 55.5 cm(2)) prepared via D-bar coating in air. To our knowledge, this PCE is the highest reported to date for NFA-based large-area OSC modules processed from a non-halogenated solvent. This asymmetric alkyl-chain engineering strategy can be exploited to develop high-performance large-area NFA-OSCs with eco-friendly solvent processing.
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