A 19% efficient and stable organic photovoltaic device enabled by a guest nonfullerene acceptor with fibril-like morphology
A 19% efficient and stable organic photovoltaic device enabled by a guest nonfullerene acceptor with fibril-like morphology
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DOI：
10.1039/d2ee03483b
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发表时间：
2023-01-06
影响因子：
32.5
通讯作者：
Lin, Yuanbao
中科院分区：
文献类型：
--
作者：
Chen, Hu;Jeong, Sang Young;Lin, Yuanbao
非富勒烯受体 isoIDITC 能够表现出原纤维样形态，被用作有机光伏器件 (OPV) 中的第三种成分。三元 PM6:BTP-eC9:isoIDITC 体异质结 (BHJ) 器件的功率转换效率 (PCE) 达到 19%。分析揭示了合金模型 (BTP-eC9:isoIDTIC) 和明确的原纤维状网络的形成，以及三元共混物中 BHJ 的结晶增强。与二元 PM6:BTP-eC9 BHJ 电池相比，基于三元 BHJ 的装置中观察到载流子迁移率略有增加、载流子寿命更长、陷阱辅助/双分子重组受到抑制。此外，由于BTP-eC9的高表面能（γ）和低玻璃化转变温度（T-g），在老化测试过程中，受体和供体往往分别向空穴和电子收集电极迁移。至关重要的是，具有低伽玛和高 T-g 的 isoIDTIC 具有低扩散系数，可以抑制 BHJ 垂直分层中的分层，从而将 T-80 寿命从 101 小时延长至 254 小时。我们的结果强调了利用具有原纤维状形态和高 T-g 的非富勒烯受体作为高性能和稳定的三元 OPV 的重要第三组分。
A nonfullerene acceptor, isoIDITC, capable of exhibiting fibril-like morphology, is utilized as a third component in organic photovoltaic devices (OPVs). A power conversion efficiency (PCE) of 19% is achieved in ternary PM6:BTP-eC9:isoIDITC bulk-heterojunction (BHJ) devices. Analyses reveal the formation of an alloy model (BTP-eC9:isoIDTIC) and a well-defined fibril-like network and enhanced crystallization of BHJ in the ternary blend. Slightly increased carrier mobilities, longer carrier lifetimes, and suppressed trap-assisted/bimolecular recombination are observed in the ternary BHJ-based devices compared to the binary PM6:BTP-eC9 BHJ cells. Moreover, because of the high surface energy (gamma) and low glass-transition temperature (T-g) of BTP-eC9, the acceptor and donor tend to migrate toward the hole and electron collecting electrodes, respectively, during aging tests. Crucially, isoIDTIC with low gamma and high T-g has a low diffusion coefficient and can suppress demixing in vertical stratification of the BHJ, resulting in an increase in T-80 lifetime from 101 hours to 254 hours. Our results highlight the utilization of the nonfullerene acceptor with fibril-like morphology and high T-g as an important third component toward high-performance and stable ternary OPVs.