Designing High Performance Nonfullerene Electron Acceptors with Rylene Imides for Efficient Organic Photovoltaics
Designing High Performance Nonfullerene Electron Acceptors with Rylene Imides for Efficient Organic Photovoltaics
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DOI：
10.1021/acs.chemmater.9b03329
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发表时间：
2020-01-14
影响因子：
8.6
通讯作者：
Jenekhe, Samson A.
中科院分区：
文献类型：
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作者：
Kolhe, Nagesh B.;West, Sarah M.;Jenekhe, Samson A.
提高载流子迁移率、氧化还原稳定性、共混形态和光伏性能，同时阐明结构性能关系仍然是有机太阳能电池非富勒烯电子受体（NFA）的重要设计目标。尽管许多 NFA 是由萘嵌二酰亚胺缺电子结构单元制成的，但与 ITIC 等基准稠环电子受体 (FREA) 相比，它们的光伏性能要差得多。在此，我们表明，新型双（萘酰亚胺）亚芳基（BNIA）通过供体受体结构中的次甲基桥引入萘嵌苯酰亚胺封端基团，具有增强的电化学氧化还原稳定性、高载流子迁移率和高光伏性能。将这些分别为 FREA、NIDT 和 NIBT 的 BNIA 与供体聚合物 PBDB-T 配对，可产生 10.0-10.8% 效率的光伏器件，与基准 ITIC 器件相当。研究发现 FREA NIDT 和 NIBT 的混合物以及非 FREA NITV 的混合物具有相似的电子迁移率，这表明 NIDT 和 NIBT 器件更高的光伏效率并非源自增强的电荷传输，而是源自混合物形态和混合物光物理学的差异。结果表明，通过次甲基桥联的供体受体耦合基序将萘嵌苯酰亚胺纳入分子结构中是一种有前途的设计策略，可用于更高效且电化学坚固的有机太阳能电池材料。
Improving carrier mobility, redox stability, blend morphology, and photovoltaic performance while elucidating structure property relationships remains an important design goal for nonfullerene electron acceptors (NFAs) for organic solar cells. Although numerous NFAs have been created from rylene diimide electron-deficient building blocks, they have shown far inferior photovoltaic properties compared to benchmark fused-ring electron acceptors (FREAs) such as ITIC. Herein we show that new bis(naphthalene-imide)arylenelidenes (BNIAs), incorporating rylene-imide end-capping groups via methine bridges in donor acceptor architectures, are endowed with enhanced electrochemical redox stability, high carrier mobilities, and high photovoltaic performance. Pairing of those BNIAs that are also FREAs, NIDT and NIBT, respectively, with donor polymer PBDB-T produced 10.0-10.8% efficient photovoltaic devices, which are comparable to benchmark ITIC devices. Blends of FREAs NIDT and NIBT and those of non-FREA NITV were found to have similar electron mobilities, demonstrating that the much higher photovoltaic efficiency of NIDT and NIBT devices does not originate from enhanced charge transport but from differences in blend morphology and blend photophysics. The results demonstrate that incorporating rylene imides into molecular architectures through the methine-bridged donor acceptor coupling motif is a promising design strategy toward more efficient and electrochemically rugged materials for organic solar cells.