Department of Chemical Engineering, Pohang University of Science and Technology, San 31, Nam-gu, Pohang, Gyeongbuk 37673, Republic of Korea.
Department of Physics and Energy Harvest Storage Research Center, University of Ulsan, Ulsan 44610, Republic of Korea.
ACS Appl Mater Interfaces. 2023 Jun 7;15(22):27026-27033. doi: 10.1021/acsami.3c04804. Epub 2023 May 23.
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 ( and PTB7-Th) and a non-fullerene acceptor (Y6). The asymmetric n-type semiconducting polymer () differed from general symmetric semiconducting polymers as it randomly substituted fluorine atoms at the donor moiety (TVT), resulting in significantly lower crystallinity. 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: 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.
高的热稳定性对于有机太阳能电池（OSCs）的商业化至关重要。通过对体异质结（BHJ）的共混形貌进行剪裁，可以提高 OSCs 的热稳定性。在此，我们在含有低结晶半导体聚合物（和 PTB7-Th）和非富勒烯受体（Y6）的三元共混体系中展示了热稳定的 OSCs。不对称的 n 型半导体聚合物（）与一般的对称半导体聚合物不同，因为它在供体部分随机取代了氟原子（TVT），导致结晶度显著降低。在 PTB7-Th:Y6 中，表现出良好的 BHJ 混合形态，并通过增强填充因子和功率转换效率有效地促进了电荷离解过程。此外，PTB7-Th:Y6:三元体系抑制了相分离，在热应力下几乎没有初始损耗和性能下降。实验表明，我们的无封装器件在 65°C 下放置 100 小时后，仍保留超过 90%的初始效率。这些结果表明，具有合理效率的热稳定 OSCs 的开发具有很大的潜力。
