Wei Yanan, Zhou Xianmin, Cai Yunhao, Li Yun, Wang Siying, Fu Zhen, Sun Rui, Yu Na, Li Congqi, Huang Kexin, Bi Zhaozhao, Zhang Xin, Zhou Yinhua, Hao Xiaotao, Min Jie, Tang Zheng, Ma Wei, Sun Yanming, Huang Hui
College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China.
Adv Mater. 2024 Jul;36(28):e2403294. doi: 10.1002/adma.202403294. Epub 2024 May 3.
High performance organic solar cells (OSCs) are usually realized by using post-treatment and/or additive, which can induce the formation of metastable morphology, leading to unfavorable device stability. In terms of the industrial production, the development of high efficiency as-cast OSCs is crucially important, but it remains a great challenge to obtain appropriate active layer morphology and high power conversion efficiency (PCE). Here, efficient as-cast OSCs are constructed via introducing a new polymer acceptor PY-TPT with a high dielectric constant into the D18:L8-BO blend to form a double-fibril network morphology. Besides, the incorporation of PY-TPT enables an enhanced dielectric constant and lower exciton binding energy of active layer. Therefore, efficient exciton dissociation and charge transport are realized in D18:L8-BO:PY-TPT-based device, affording a record-high PCE of 18.60% and excellent photostability in absence of post-treatment. Moreover, green solvent-processed devices, thick-film (300 nm) devices, and module (16.60 cm) are fabricated, which show PCEs of 17.45%, 17.54%, and 13.84%, respectively. This work brings new insight into the construction of efficient as-cast devices, pushing forward the practical application of OSCs.
高性能有机太阳能电池（OSCs）通常通过后处理和/或添加剂来实现，这会诱导亚稳形态的形成，导致器件稳定性不佳。就工业生产而言，开发高效的铸态OSCs至关重要，但获得合适的活性层形态和高功率转换效率（PCE）仍然是一个巨大的挑战。在此，通过将具有高介电常数的新型聚合物受体PY-TPT引入D18:L8-BO共混物中，构建高效的铸态OSCs，以形成双纤维网络形态。此外，PY-TPT的加入使活性层的介电常数提高，激子束缚能降低。因此，在基于D18:L8-BO:PY-TPT的器件中实现了高效的激子解离和电荷传输，在无需后处理的情况下提供了创纪录的18.60%的高PCE和优异的光稳定性。此外，还制备了绿色溶剂处理的器件、厚膜（300 nm）器件和模块（16.60 cm），其PCE分别为17.45%、17.54%和13.84%。这项工作为高效铸态器件的构建带来了新的见解，推动了OSCs的实际应用。
