Issue 16, 2022

Hydrogen-bond-induced cathode engineering interface achieving high-efficiency organic solar cells

Abstract

In organic solar cells (OSCs), interlayers play a critical role in achieving good device performance and stability. However, the effects of hydrogen bonds between the interlayer and the active layer are less studied. In this work, a new interlayer modification strategy through hydrogen bonds is presented, and the interaction mechanism between the interlayer and the active layer is deeply analyzed. We use a new hydrogen-bond-induced interfacial material, 1H-benzimidazole-5-carboxylic acid (2N-SAM), as an interlayer and fabricate a high-power conversion efficiency of 16.03% in OSCs (compared to the 14.50% of pristine ZnO-based OSCs) based on PM6:Y6. Hydrogen bonds are formed between the Nā€“H bonds of 2N-SAM and the F atoms of acceptor Y6, achieving a vertical phase separation in the active layer of the acceptor enrichment at the cathode and improving the transportation of electrons. Finally, the short-circuit current (JSC) is dramatically increased from 24.73 mA cmāˆ’2 to 27.08 mA cmāˆ’2. This demonstrates that hydrogen bonding between the interlayer and the active layer is a potential means to improve the performance of OSCs.

Graphical abstract: Hydrogen-bond-induced cathode engineering interface achieving high-efficiency organic solar cells

Supplementary files

Article information

Article type
Paper
Submitted
24 Oct 2021
Accepted
06 Mar 2022
First published
30 Mar 2022

J. Mater. Chem. C, 2022,10, 6358-6364

Hydrogen-bond-induced cathode engineering interface achieving high-efficiency organic solar cells

B. Ma, H. Lin, M. Li, X. Yu, X. Li, X. Du, G. Yang, C. Zheng and S. Tao, J. Mater. Chem. C, 2022, 10, 6358 DOI: 10.1039/D1TC05129F

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