Citation: Yanhong Chang, Jing Li, Yilin Chang, Yixiao Zhang, Jianqi Zhang, Kun Lu, Xiangnan Sun, Zhixiang Wei. Enhancing the performances of all-small-molecule ternary organic solar cells via achieving optimized morphology and 3D charge pathways[J]. Chinese Chemical Letters, ;2021, 32(9): 2904-2908. doi: 10.1016/j.cclet.2021.03.067 shu

Enhancing the performances of all-small-molecule ternary organic solar cells via achieving optimized morphology and 3D charge pathways

Yanhong Chang ^{a, c, 1} ,
Jing Li ^{a, b, c, 1} ,
Yilin Chang ^{b, d} ,
Yixiao Zhang ^{b, d} ,
Jianqi Zhang ^b ,
Kun Lu ^{b, d, *,} ,
Xiangnan Sun ^{b, d, e, f, *,} ,
Zhixiang Wei ^{b, d, *,}

a.
Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
b.
CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
c.
Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing 100083, China
d.
University of Chinese Academy of Sciences, Beijing 100049, China
e.
Shandong First Medical University & Shandong Academy of Medical Sciences, Taian 271016, China
f.
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China

lvk@nanoctr.cn

sunxn@nanoctr.cn

weizx@nanoctr.cn

Received Date: 30 November 2020
Revised Date: 15 March 2021
Accepted Date: 24 March 2021
Available Online: 26 March 2021

Figures(4)

With the emergence of non-fullerene acceptors (NFAs), the power conversion efficiencies (PCEs) of all-small-molecule organic solar cells (ASM-OSCs) have been significantly improved. However, due to the strong crystallinities of small molecules, it is much more challenging to obtain the ideal phase separation morphology and efficient charge transport pathways for ASM-OSCs. Here, a high-efficiency ternary ASM-OSC has been successfully constructed based on H11/IDIC-4F system by introduction of IDIC with a similar backbone as IDIC-4F but weak crystallinity. Notably, the addition of IDIC has effectively suppressed large-scale phase aggregation and optimized the morphology of the blend film. More importantly, the molecular orientation has also been significantly adjusted, and a mixed face-on and edge-on orientation has formed, thus establishing a more favorable three-dimensional (3D) charge pathways in the active layer. With these improvements, the enhanced short-circuit current density (J_SC) and fill factor (FF) of the ternary system have been achieved. In addition, because of the high lowest unoccupied molecular orbital (LUMO) energy level of IDIC as well as the alloyed structure of the IDIC and IDIC-4F, the promoted open circuit voltage (V_OC) of the ternary system has also been realized.
- All-small-molecule,
- Ternary organic solar cells,
- Alloyed acceptor,
- Morphology optimization,
- 3D charge pathways
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