期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 144, 期 32, 页码 14731-14739出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.2c05303
关键词
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资金
- NSFC [52103352, 51925306, 52120105006]
- National Key R&D Program of China [2018FYA 0305800]
- Key Research Program of Chinese Academy of Sciences [XDPB08-2]
- Chinese Academy of Sciences [XDB28000000]
- Youth Innovation Promotion Association of Chinese Academy of Sciences [2022165]
- Fundamental Research Funds for the Central Universities
Volatile solid additives (SADs) are a simple and effective method to adjust the film morphology of high-performance organic solar cells (OSCs). This study designed and synthesized two volatilizable SADs, and the results revealed that the planar SAD2 can more easily insert between Y6 molecules, leading to a tighter molecular packing mode and improved photovoltaic performance.
Volatile solid additives (SADs) are considered as a simple yet effective approach to tune the film morphology for high-performance organic solar cells (OSCs). However, the structural effects of the SADs on the photovoltaic performance are still elusive. Herein, two volatilizable SADs were designed and synthesized. One is SAD1 with twisted conformation, while the other one is planar SAD2 with the S center dot center dot center dot O noncovalent intra-molecular interactions (NIIs). The theoretical and experimental results revealed that the planar SAD2 with smaller space occupation can more easily insert between the Y6 molecules, which is beneficial to form a tighter intermolecular packing mode of Y6 after thermal treatment. As a result, the SAD2-treated OSCs exhibited less recombination loss, more balanced charge mobility, higher hole transfer rate, and more favorable morphology, resulting in a record power conversion efficiency (PCE) of 18.85% (certified PCE: 18.7%) for single-junction binary OSCs. The universality of this study shed light on understanding the conformation effects of SADs on photovoltaic performances of OSCs.
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