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| 1 | Unraveling the Effect of Solvent Additive and Fullerene Component on Morphological Control in Organic Solar Cells显示文摘The manipulation of the morphology of the active layers is crucial for improving the performance of organic photovoltaic(OPV)devices. In particular, the development of non-fullerene acceptors(NFAs) has led to a large number of new materials with more complex interactions. Therefore, the investigation on the morphology control mechanism is the key aspect in providing guidance for material design and device optimization. In this study, the film morphology optimization using 1,8-diiodooctane(DIO) additive and a ternary fullerene acceptor strategy have been carried out based on the PCE10:ITIC blends. It is seen that suitable amount of DIO helps to increase the crystallization of the blended thin film. However, excessive DIO elevates the crystallization-induced phase separation and the domain size can exceed the exciton diffusion length, leading to efficiency drop. The addition of fullerene acceptor can improve the carrier transport of the blends, and its presence could retard the excessive phase separation induced by DIO additive. Under the joint optimization of the solvent additive and PCBM acceptor,the film morphology achieves a balance between crystallization and phase separation scales, the exciton diffusion and carrier transport are also optimized, and the short-circuit current(JSC) and fill factor(FF) of the device can be improved significantly. | Lei Zhu Quan-Zeng Zhang Hong Ding Ming Zhang Xiao-Nan Xue Wen-Kai Zhong Zi-Chun Zhou Jin-Qiu Xu Wei Feng Ye-Cheng Zou Yong-Ming Zhang Feng Liu | 2022 | Chinese Journal of Polymer Science2022，40，12： | 0 |
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