Acta Phys. -Chim. Sin. ›› 2018, Vol. 34 ›› Issue (4): 391-406.doi: 10.3866/PKU.WHXB201709131

Special Issue: 非富勒烯有机太阳能电池

• FEATURE ARTICLE • Previous Articles     Next Articles

Morphology Control of Non-fullerene Blend Systems Based on Perylene

Jie HAN1,Qiuju LIANG2,3,Yi QU1,4,*(),Jiangang LIU2,*(),Yanchun HAN2,*()   

  1. 1 State Key Laboratory of High Power Semiconductor Laser; Changchun University of Science and Technology, Changchun 130022, P. R. China
    2 State Key Laboratory of Polymer Physics and Chemistry; Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
    3 University of the Chinese Academy of Sciences, Beijing 100049, P. R. China
    4 College of Physics & Electronic Engineering; Hainan Normal University, Haikou 571158, P. R. China
  • Received:2017-08-11 Published:2018-01-02
  • Contact: Yi QU,Jiangang LIU,Yanchun HAN E-mail:2686566673@qq.com;niitawh@ciac.ac.cn;ychan@ciac.ac.cn
  • Supported by:
    the National Natural Science Foundation of China(51573185);the National Natural Science Foundation of China(21334006);the National Natural Science Foundation of China(21474113);the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB12020300)

Abstract:

In recent years, the development of perylene diimide derivative (PDI)-based non-fullerene organic solar cells has been extensively studied. These solar cells exhibit unique advantages such as complementary light absorption, tunable energy levels, excellent electron transport properties, and relatively low cost. However, the strong π-π stacking between the PDI molecules tends to induce an uncontrolled phase separation structure, large domain size, and an unmanageable mixed phase, leading to severe geminate and non-geminate recombination and restriction of the final power conversion efficiency of the non-fullerene-based systems. In this work, it was found that one of the most important parameters that helps regulate phase structure is the molecular diffusion rate. By tuning the thermal annealing and liquid-solid phase separation and blend ratio, the phase-separated structure could be adjusted. Further, the domain size of blend systems with different compatibilities was regulated by balancing the π-π and charge transfer interactions. In addition, the amount of the intermixed phase was controlled by tuning the solubility parameter difference (Δδ) between the solvent and the solute.

Key words: Solar cells, Nonfullerene, Morphology control, Phase separation, Domain size, Intermixed phase

MSC2000: 

  • O649