Guo Siru, Hu Yingyue, Qin Meng, Li Jianshu, Wang Yinghan, Qin Jiaqiang, Cheng Pei
College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, P. R. China.
Mater Horiz. 2022 Aug 1;9(8):2097-2108. doi: 10.1039/d2mh00376g.
Organic photovoltaics (OPVs) have long been a hot topic due to their light weight, low cost, and flexibility. Simple blend-based OPVs have sufficient donor/acceptor (D/A) interfaces and high exciton dissociation efficiency, which result in certified high power conversion efficiency (PCE) exceeding 18%. However, the difficult morphology control and poor device stability limit further progress toward higher PCE and future application. Sequential solution-processing with tunable vertical phase distribution, D/A interfaces, and charge transportation pathways not only benefit device stability but can also overcome the up-scaling challenge. In recent years, the development of non-fullerene acceptors (NFAs) has been very rapid, which is attributed to their tunable energy levels, bandgaps, planarity, and crystallinity. In this minireview, the opportunities for the cooperation of sequential solution-processing and NFAs are revealed based on their characteristics, such as diverse molecular shapes, abundant functional groups and heteroatoms, and various aggregation states for NFAs; independent active layer processing, controllable D/A interfaces, and excellent device stability for sequential solution-processing. Few but important existing examples are discussed to display the prospects of sequential solution-processed fullerene-free OPVs toward high PCE, good device stability, high semitransparency, and large-area industrial manufacture. Finally, some possible research directions are predicted and the main issues that need to be overcome are proposed for sequential solution-processed fullerene-free OPVs toward higher performance.
有机光伏（OPV）由于其重量轻、成本低和柔韧性，长期以来一直是一个热门话题。简单的基于共混物的有机光伏具有足够的供体/受体（D/A）界面和高激子解离效率，这使得认证的功率转换效率（PCE）超过18%。然而，难以控制的形貌和较差的器件稳定性限制了向更高PCE和未来应用的进一步发展。具有可调垂直相分布、D/A界面和电荷传输路径的顺序溶液处理不仅有利于器件稳定性，还可以克服放大挑战。近年来，非富勒烯受体（NFA）的发展非常迅速，这归因于它们可调的能级、带隙、平面度和结晶度。在这篇综述中，基于顺序溶液处理和NFA的特性，揭示了它们合作的机会，例如NFA多样的分子形状、丰富的官能团和杂原子以及各种聚集状态；顺序溶液处理的独立活性层处理、可控的D/A界面和优异的器件稳定性。讨论了一些虽少但重要的现有例子，以展示顺序溶液处理的无富勒烯有机光伏在实现高PCE、良好器件稳定性、高半透明度和大面积工业制造方面的前景。最后，预测了一些可能的研究方向，并提出了顺序溶液处理的无富勒烯有机光伏为实现更高性能需要克服的主要问题。
