A Highly Efficient Non-Fullerene Organic Solar Cell with a Fill Factor over 0.80 Enabled by a Fine-Tuned Hole-Transporting Layer

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Author(s)
Zheng, Zhong
Hu, Qin
Zhang, Shaoqing
Zhang, Dongyang
Wang, Jianqiu
Xie, Shenkun
Wang, Rong
Qin, Yunpeng
Li, Wanning
Hong, Ling
Liang, Ningning
Liu, Feng
Zhang, Yuan
Wei, Zhixiang
Tang, Zhiyong
Russell, Thomas P
Hou, Jianhui
Zhou, Huiqiong
Griffith University Author(s)
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2018
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Abstract

With rapid development for tens of years, organic solar cells (OSCs) have attracted much attention for their potential in practical applications. As an important photovoltaic parameter, the fill factor (FF) of OSCs stands for the effectiveness of charge generation and collection, which significantly depends on the properties of the interlayer and active layer. Here, a facile and effective strategy to improve the FF through hole‐transporting layer (HTL) modification is demonstrated. By mixing WOx nanoparticles with a poly(3,4‐ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) emulsion, the surface free energy of the HTL is improved and the morphology of the active layer is optimized. Benefiting from increased carrier lifetime, a device based on WOx:PEDOT:PSS HTL exhibits a boosted performance with an FF of 80.79% and power conversion efficiency of 14.57% PCE. The results are certified by the National Institute of Metrology (NIM), which, to date, are the highest values in this field with certification. This work offers a simple and viable option of HTL modification to realize highly efficient OSCs.

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ADVANCED MATERIALS

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30

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34

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Physical sciences

Chemical sciences

Engineering

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