【摘要】 有机太阳能电池(Organic solar cells, OSCs)作为一种新兴高效太阳能电池,近年来得到飞速发展.目前OSCs的光电转换效率(Powerconversionefficiency,PCE)已经达到19%以上,初见商业化应用曙光.但其稳定性方面尚未发展成熟,尤其在制备和工作过程中电池器件需要经历高温考验,电池的热稳定性要求高.三元共混策略是在传统的二元OSCs活性层中引入第三组分,利用第三组分调控分子间的相互作用,在实现高效光电转换效率的同时有效提高器件热稳定性,展现出了极大的应用潜力.本综述首先从器件热衰减过程出发,总结了OSCs热衰减过程中包括:热致活性层形貌变化、各层材料之间的互扩散行为以及界面老化等相关机制.在此基础上,重点介绍了三元策略在提高OSCs热稳定性方面的应用进展和作用机制.最后,对三元策略在OSCs中的应用发展进行总结并展望,指出第三组分的针对性选择以及作用机制解析是三元OSCs面临的关键问题和挑战.更多还原

【Abstract】 As an emerging high-efficiency solar cell, organic solar cells(OSCs) have been developed rapidly in recent years.The power conversion efficiency(PCE) of OSCs has reached more than 19%, which is the dawn of commercial application.However, the stability of OSCs is not yet satisfied, especially high processing and operation temperature may be applied to the cells, which requires a high thermal stability of the cells. The ternary strategy, where a third component is introduced into the photoactive layer of donor-acceptor based binary OSCs, was found to be able to simultaneously improve device performance and stability by regulating the intermolecular interactions, showing a great potential for application. In this review, we firstly summarized the mechanisms involved in the thermal decay process of OSCs, including thermally induced morphology changes of the photoactive layer, interfacial aging/chemical reactions, and interdiffusion behavior between the layers. Following this, the research progress of the ternary strategies in improving thermal stability are highlighted, and the mechanism for the stabilization effect is reviewed. By the end, the perspective of the ternary strategies in OSCs is given, pointing out that the selection of the proper third component and the understanding on the mechanism of the stabilization effect are the key issues and challenges.更多还原