An asymmetric wide-bandgap acceptor simultaneously enabling highly efficient single-junction and tandem organic solar cells

Jianqiu Wang; Maojie Zhang; Ji Lin; Zhong Zheng; Lei Zhu; Pengqing Bi; Haiyan Liang; Xia Guo; Jingnan Wu; Yafei Wang; Linfeng Yu; Jiayao Li; Junfang Lv; Xiaoyu Liu; Feng Liu; Jianhui Hou; Yongfang Li

doi:10.1039/D1EE03673D

An asymmetric wide-bandgap acceptor simultaneously enabling highly efficient single-junction and tandem organic solar cells†

Jianqiu Wang,^ab Maojie Zhang,

*^a Ji Lin,^a Zhong Zheng,^ac Lei Zhu,

^d Pengqing Bi,^b Haiyan Liang,^a Xia Guo,

^a Jingnan Wu,^a Yafei Wang,^be Linfeng Yu,^a Jiayao Li,^be Junfang Lv,^a Xiaoyu Liu,^ac Feng Liu,

^d Jianhui Hou

^be and Yongfang Li

^aef

Author affiliations

* Corresponding authors

^a Laboratory of Advanced Optoelectronic Materials, Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and Devices, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
E-mail: mjzhang@suda.edu.cn

^b State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China

^c School of Chemistry and Biology Engineering University of Science and Technology Beijing, Beijing 100083, China

^d Frontiers Science Center for Transformative Molecules, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China

^e University of Chinese Academy of Sciences, Beijing 100049, China

^f CAS Key Laboratory of Organic Solids, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China

Abstract

Ternary and tandem strategies are effective methods for improving the photovoltaic performance of organic solar cells (OSCs). Here an asymmetric wide-bandgap nonfullerene acceptor named AITC is synthesized. AITC with a bandgap of 1.75 eV exhibits a good complementary absorption spectrum with the narrow bandgap acceptor BTP-eC9. AITC also shows good miscibility with BTP-eC9, which facilitates the formation of a stable mixing phase in blends. Moreover, the large dipole moment of AITC reinforces the molecular packing in the blend films of PM6 and BTP-eC9, thereby enhancing the photoconductivity, suppressing charge recombination and reducing nonradiative voltage loss in ternary OSCs. As a result, the ternary OSCs based on PM6:BTP-eC9:AITC achieve an outstanding power conversion efficiency (PCE) of 18.8%. In addition, tandem OSCs using PM6:AITC as a bottom subcell and the PM6:AITC:BTP-eC9 ternary active layer as a top subcell exhibit a remarkable efficiency of 19.4%, which is one of the highest PCEs in the field.

Energy & Environmental Science

An asymmetric wide-bandgap acceptor simultaneously enabling highly efficient single-junction and tandem organic solar cells†

Abstract

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An asymmetric wide-bandgap acceptor simultaneously enabling highly efficient single-junction and tandem organic solar cells

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