Highly efficient ITO-free organic solar cells with a column-patterned microcavity

Jiang Huang; Dan Zhao; Zifan Dou; Qingshan Fan; Na Li; Shuihai Peng; Haoran Liu; Yadong Jiang; Junsheng Yu; Chang-Zhi Li

doi:10.1039/D0EE03387A

Highly efficient ITO-free organic solar cells with a column-patterned microcavity†

Jiang Huang,^ab Dan Zhao,^a Zifan Dou,^a Qingshan Fan,^a Na Li,^a Shuihai Peng,^a Haoran Liu,^c Yadong Jiang,*^a Junsheng Yu

*^a and Chang-Zhi Li

*^c

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* Corresponding authors

^a State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, P. R. China
E-mail: jiangyd@uestc.edu.cn, jsyu@uestc.edu.cn

^b Institute of Electronic and Information Engineering of UESTC in Guangdong, Guangdong 523808, P. R. China

^c State Key Laboratory of Silicon Materials, MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China
E-mail: czli@zju.edu.cn

Abstract

Achieving high-efficiency organic solar cells (OSCs) requires well balancing the trade-off between the voltage loss and photocurrent generation of bulk heterojunction (BHJ) blends. In this work, we develop high-performance ITO-free OSCs through incorporating a newly designed column-patterned microcavity (CPM) for effective optical confinement of thin near-infrared BHJs. With the assistance of optical interference, light scattering and local surface plasmons of patterned electrodes, the photocurrent density (J_sc) values of OSCs are largely improved for thin BHJs with near 100 nm thickness. In addition, the high open circuit voltage (V_oc) and fill factor (FF) are secured in self-assembled monolayer (SAM) treated ITO-free OSCs. As a result, the power conversion efficiencies (PCEs) of ITO-free OSCs in the inverted architecture have reached 15.5% and 17.5% for ternary PBDB-T-SF:ITIC-Th:IT-4F and binary PM6:Y6 blends, respectively, yet exhibiting the desirable features of less incident angle dependence. Overall, these OSCs with CPM not only reach significant performance-enhancement over the corresponding ITO devices, but also represent the best performing ITO-free OSCs so far.

Energy & Environmental Science

Highly efficient ITO-free organic solar cells with a column-patterned microcavity†

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Highly efficient ITO-free organic solar cells with a column-patterned microcavity

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