Issue 6, 2022

Manipulating the D:A interfacial energetics and intermolecular packing for 19.2% efficiency organic photovoltaics

Abstract

Manipulating the donor:acceptor (D:A) energetics, e.g., the highest occupied molecular orbital (HOMO) offset, is the key to balancing the charge separation and charge recombination for high-performance organic solar cells (OSCs). Herein, we designed and synthesized a non-fullerene electron acceptor, i.e., BTP-H2, which shows strong intermolecular interaction and near-zero HOMO offset when pairing with polymer donor PM6. Transient absorption spectroscopies unveil that BTP-H2 exhibits a long-lived intra-moiety charge-separation state, which contributes to efficient hole transfer or charge generation, irrespective of the small HOMO offset. In addition, the small energetic offset reduces the non-radiative loss for a high open-circuit voltage (Voc). As a result, we demonstrate high-performance OSCs with the best power conversion efficiency (PCE) of 18.5%, a high Voc of 0.932 V and a peak photon-to-electron response of ∼ 90%. Furthermore, ternary OSCs comprising PM6:BTP-H2:L8-BO exhibit a champion PCE of 19.2% (certified value of 18.8%) due to the improved balance between charge generation and charge recombination, and this represents the best among PCEs of single-junction OSCs.

Graphical abstract: Manipulating the D:A interfacial energetics and intermolecular packing for 19.2% efficiency organic photovoltaics

Supplementary files

Article information

Article type
Paper
Submitted
21 Feb 2022
Accepted
20 Eph 2022
First published
20 Eph 2022

Energy Environ. Sci., 2022,15, 2537-2544

Manipulating the D:A interfacial energetics and intermolecular packing for 19.2% efficiency organic photovoltaics

C. He, Y. Pan, Y. Ouyang, Q. Shen, Y. Gao, K. Yan, J. Fang, Y. Chen, C. Ma, J. Min, C. Zhang, L. Zuo and H. Chen, Energy Environ. Sci., 2022, 15, 2537 DOI: 10.1039/D2EE00595F

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