材料科学
有机太阳能电池
三元运算
接受者
化学工程
结晶度
聚合物
富勒烯
聚合物太阳能电池
能量转换效率
热稳定性
有机化学
复合材料
光电子学
化学
工程类
程序设计语言
凝聚态物理
物理
计算机科学
作者
Sang Ah Park,Yong Soo Kim,Dasol Chung,Jeongsu Kim,Jin Young Park,Shinuk Cho,Minjun Kim
标识
DOI:10.1021/acsami.3c04804
摘要
High thermal stability is crucial for the commercialization of organic solar cells (OSCs). The thermal stability of OSCs has been improved using the tailoring blend morphology of bulk heterojunctions (BHJs). Herein, we demonstrated thermally stable OSCs in a ternary blended system containing low-crystalline semiconducting polymers (asy-PNDI1FTVT and PTB7-Th) and a non-fullerene acceptor (Y6). The asymmetric n-type semiconducting polymer (asy-PNDI1FTVT) differed from general symmetric semiconducting polymers as it randomly substituted fluorine atoms at the donor moiety (TVT), resulting in significantly lower crystallinity. asy-PNDI1FTVT in PTB7-Th:Y6 exhibited a well-mixed morphology at the BHJ and efficiently facilitated the charge dissociation process with an enhanced fill factor and power conversion efficiency. Furthermore, the ternary system of PTB7-Th:Y6:asy-PNDI1FTVT suppressed phase separation with negligible burn-in loss and performance degradation under thermal stress. The experiments showed that our devices without encapsulation retained over 90% of their initial efficiencies after 100 h at 65 °C. These results show significant potential for the development of thermally stable OSCs with reasonable efficiency.
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