Unraveling the Effect of Solvent Additive and Fullerene Component on Morphological Control in Organic Solar Cells

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

doi:10.1007/s10118-022-2807-0

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Unraveling the Effect of Solvent Additive and Fullerene Component on Morphological Control in Organic Solar Cells

RESEARCH ARTICLE | Updated：2022-11-16

- Unraveling the Effect of Solvent Additive and Fullerene Component on Morphological Control in Organic Solar Cells
- Chinese Journal of Polymer Science Vol. 40, Issue 12, Pages: 1604-1612(2022)
- Affiliations：
  
  a.Frontiers Science Center for Transformative Molecules, In-situ Center for Physical Science, and Center of Hydrogen Science, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  b.State Key Laboratory of Fluorinated Functional Membrane Materials and Dongyue Future Hydrogen Energy Materials Company, Zibo 256401, China
- Author bio：
  
  fengliu82@sjtu.edu.cn
- Funds：
- DOI：10.1007/s10118-022-2807-0
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Lei Zhu, Quan-Zeng Zhang, Hong Ding, et al. Unraveling the Effect of Solvent Additive and Fullerene Component on Morphological Control in Organic Solar Cells. [J]. Chinese Journal of Polymer Science 40(12):1604-1612(2022)
DOI：

Lei Zhu, Quan-Zeng Zhang, Hong Ding, et al. Unraveling the Effect of Solvent Additive and Fullerene Component on Morphological Control in Organic Solar Cells. [J]. Chinese Journal of Polymer Science 40(12):1604-1612(2022) DOI： 10.1007/s10118-022-2807-0.

摘要

This work shows the effect of solvent additives and fullerene third components on the film morphology of organic solar cells and points to the importance of the balance between material crystallization and phase separation.

Abstract

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 PC,71,BM 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 (,J,SC,) and fill factor (FF) of the device can be improved significantly.

关键词

Keywords

Organic solar cellsMorphologySolvent additiveCrystallization-induced phase separation

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