Non-conjugated electrolytes as thickness-insensitive interfacial layers for high-performance organic solar cells
| Autor: | Changhao Xiang, Linqiao Wang, Bin Zhao, Chang-Zhi Li, Songting Tan, Zeyan Peng, Xiaolong Zheng, Wuxi Tao, Yufu Yu, Yang-Dan Tao |
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| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Materials science Fullerene Organic solar cell Renewable Energy Sustainability and the Environment Doping General Chemistry Electrolyte Electron acceptor Conjugated system Cathode law.invention chemistry Chemical engineering law General Materials Science Work function |
| Zdroj: | Journal of Materials Chemistry A. 9:22926-22933 |
| ISSN: | 2050-7496 2050-7488 |
| Popis: | Non-conjugated electrolytes, PMDETA-DBO and PEDETA-DBO, are developed through the quaternization of diethylenetriamine derivatives with 1,8-dibromooctane, which can interestingly be deployed as low-cost, thickness-insensitive and low-temperature processable electron transporting layers (ETLs) for organic solar cells (OSCs). Compared with PMDETA-DBO with methyl groups, PEDETA-DBO with hydroxyethyl groups leads to better photovoltaic performance in OSCs, as PEDETA-DBO not only has stronger capability to tune the work function of cathodes, but also allows better accommodation of the penetrated electron acceptors into ETLs for efficient electron extraction. Fullerene-based OSCs with PEDETA-DBO achieve PCEs of 10.41% and 9.63% under 10 and 50 nm layer thicknesses, respectively. And the OSCs based on the PM6:Y6 blend achieve PCEs of 16.57% and 15.33% under the thicknesses of 5 and 30 nm, respectively. We reveal that the electron acceptors spun atop could penetrate into the network of non-conjugated electrolytes, wherein the contact doping between the electrolytes and acceptors results in efficient electron extraction with a desirable thickness-insensitive property in inverted OSCs. Moreover, the conversion of tertiary amines into ammonium helps suppress the degradation of non-fullerene acceptors in inverted OSCs. Overall, this work provides a strategy to exploit low-cost and thickness-insensitive non-conjugated ETLs for OSCs. |
| Databáze: | OpenAIRE |
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