Rational Mutual Interactions in Ternary Systems Enable High-Performance Organic Solar Cells
Rational Mutual Interactions in Ternary Systems Enable High-Performance Organic Solar Cells
复制标题
三元系统中合理的相互作用使高性能有机太阳能电池成为可能
DOI：
10.1002/adfm.202007088
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发表时间：
2020-10-05
影响因子：
19
通讯作者：
Bao, Xichang
中科院分区：
文献类型：
--
作者：
Jiang, Huanxiang;Han, Chenyu;Bao, Xichang
三元有机太阳能电池（TOSC）提供了一种简单有效的方法来提高功率转换效率（PCE）。然而，客体组分在复杂的三元体系中所起的关键作用仍然知之甚少。本文研究了结晶度不同的两种受主LA 1和LA 9。过度结晶的LA 9在PM 6：LA 9二元系统中诱导大的自聚集体，导致与PM 6：LA 1装置（13.89%）相比更低的PCE（13.12%）。令人鼓舞的是，这两种受体被验证为有效的客体候选人到主机二进制PM 6：NCBDT-4Cl（PCE = 13.48%），并提供显着改善的PCE高达15.39%和15.75%，分别在LA 1和LA 9三元器件。有趣的是，较高的结晶度LA 9揭示了与主体受体和供体PM 6两者的较小的相互作用能。与LA 1相比，LA 9三元体系中适当的相互作用不仅诱导了PM 6的有序结晶，而且与宿主受体具有更好的相容性，产生进一步优化的分子取向和三元形态。因此，在LA 9三元器件中检测到增强的电荷传输和最小化的复合损失，从而在Y 6掺杂的TOSC中提供最具竞争力的性能。这项工作表明，复杂的分子间相互作用，应认真考虑时，制造国家的最先进的多组分的OSC。
Ternary organic solar cells (TOSCs) offer a facile and efficient approach to increase the power conversion efficiencies (PCEs). However, the critical roles that guest components play in complicated ternary systems remain poorly understood. Herein, two acceptors named LA1 and LA9 with differing crystallinity are investigated. The overly crystalline LA9 induces large self-aggregates in PM6:LA9 binary system, resulting in a lower PCE (13.12%) compared to PM6:LA1 device (13.89%). Encouragingly, both acceptors are verified as efficient guest candidates into the host binary PM6:NCBDT-4Cl (PCE = 13.48%) and afford markedly improved PCEs up to 15.39% and 15.75% in LA1 and LA9 ternary devices, respectively. Interestingly, the higher crystallinity LA9 reveals smaller interaction energies with both the host acceptor and donor PM6. Compared to LA1, the appropriate mutual interactions in the LA9 ternary system not only induces the orderly crystallinity of PM6 but also better compatibility with the host acceptor, generating further optimized molecular orientations and ternary morphology. Therefore, enhanced charge transport and minimized recombination loss are detected in LA9 ternary devices, affording the most competitive performance among Y6-sbsent TOSCs. This work suggests that complicated intermolecular interactions should be seriously considered when fabricating state-of-the-art multiple components OSCs.