Ferrocene as a highly volatile solid additive in non-fullerene organic solar cells with enhanced photovoltaic performance

Linglong Ye; Yunhao Cai; Chao Li; Lei Zhu; Jinqiu Xu; Kangkang Weng; Kangning Zhang; Miaofei Huang; Min Zeng; Tengfei Li; Erjun Zhou; Songting Tan; Xiaotao Hao; Yuanping Yi; Feng Liu; Zhaohui Wang; Xiaowei Zhan; Yanming Sun

doi:10.1039/D0EE02426K

Ferrocene as a highly volatile solid additive in non-fullerene organic solar cells with enhanced photovoltaic performance†

Linglong Ye,‡^ab Yunhao Cai,‡*^a Chao Li,^a Lei Zhu,

^c Jinqiu Xu,^c Kangkang Weng,^a Kangning Zhang,^d Miaofei Huang,^e Min Zeng,^b Tengfei Li,^f Erjun Zhou,

^g Songting Tan,

^b Xiaotao Hao,^d Yuanping Yi,

^e Feng Liu,

^c Zhaohui Wang,

^h Xiaowei Zhan

^f and Yanming Sun

*^a

Author affiliations

* Corresponding authors

^a School of Chemistry, Beihang University, Beijing 100191, P. R. China
E-mail: caiyunhao@buaa.edu.cn, sunym@buaa.edu.cn

^b College of Chemistry, Xiangtan University, Xiangtan 411105, P. R. China

^c School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China

^d School of Physics State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, P. R. China

^e Beijing National Laboratory for Molecular Science, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China

^f Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, P. R. China

^g CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, P. R. China

^h Key Laboratory of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China

Abstract

At present, most of the top-performing organic solar cells (OSCs) are processed with high boiling point solvent additives, which usually have a negative effect on the device stability. To overcome this conundrum, we herein introduce a commercially available organic transition metal compound, ferrocene, as a highly volatile solid additive in OSCs. The utilization of ferrocene led to enhanced power conversion efficiency (PCE) and photostability of PM6:Y6 based OSCs in comparison with the devices processed with a traditional solvent additive. Systematic analysis revealed that the treatment with ferrocene can effectively increase the molecular crystallinity and thus leads to improved charge transport, which accounts for the achieved higher photovoltaic performance in the corresponding OSCs. Moreover, ferrocene was found to exhibit general applicability in five other bulk-heterojunction systems. This work not only demonstrates a cost effective and highly volatile solid additive, but also opens a new possibility toward further improvement of the PCE and stability of OSCs.

Energy & Environmental Science

Ferrocene as a highly volatile solid additive in non-fullerene organic solar cells with enhanced photovoltaic performance†

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Ferrocene as a highly volatile solid additive in non-fullerene organic solar cells with enhanced photovoltaic performance

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