Julolidine functionalized benzimidazoline‐doped fullerene derivatives for efficient and stable perovskite solar cells

Author:

Zhu Yanqing1,Li Chenglong2,Chen JiaHui1,Zhang Yuxi1,Lu Jianfeng1ORCID,Hu Min3,Li Wangnan4,Huang Fuzhi2ORCID,Cheng Yi‐Bing2,Park Hyesung56,Xiao Shengqiang27

Affiliation:

1. State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Wuhan China

2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China

3. School of Electronic and Electrical Engineering, Hubei Province Engineering Research Centre for Intelligent Micro‐Nano Medical Equipment and Key Technologies Wuhan Textile University Wuhan China

4. Hubei Key Laboratory of Low Dimensional Optoelectronic Material and Devices Hubei University of Arts and Science Xiangyang Hubei China

5. KU‐KIST Graduate School of Converging Science and Technology Korea University Seoul Republic of Korea

6. Department of Integrative Energy Engineering Korea University Seoul Republic of Korea

7. Hubei Key Laboratory of Fuel Cell Wuhan China

Abstract

AbstractFullerene derivatives are highly attractive materials in solar cells, organic thermoelectrics, and other devices. However, the intrinsic low electron mobility and electrical conductivity restrict their potential device performance, such as perovskite solar cells (PSCs). Herein, we successfully enhanced the electric properties and morphology of phenyl‐C61‐butyric acid methyl ester (PCBM) by n‐doping it with a benzimidazoline derivative, 9‐(1,3‐dimethyl‐2,3‐dihydro‐1H‐benzoimidazol‐2‐yl)‐julolidine (JLBI‐H) via a solution process. We found the n‐doping can not only improve the conductivity and optimize the band alignment but also enable the PCBM to have a constantly strong charge extraction ability in a wide temperature from 173 to 373 K, which guarantees a stable photovoltaic performance of the corresponding PSCs under a wide range of operating temperatures. With the JLBI‐H‐doped PCBM, we improved the efficiency from 17.9% to 19.8%, along with enhanced stability of the nonencapsulated devices following the aging protocol of ISOS‐D‐1.

Publisher

Wiley

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