journal article·2024-11-08

Correlation of Dimer-Linker-Induced Conformational Lock with Nonradiative Energy Loss in Organic Solar Cells

Huanhuan Gao, Baobing Fan, Liyang Yu, Yiwen Wang, Ruipeng Li, Wenlin Jiang, Tianqi Chen, Jie Zeng, Francis R. Lin, Bin Kan, Hongxiang Li, Lei Wang, Alex K.-Y. Jen

ACS Energy Letters· Volume 9· Issue 11
Publisher page

Abstract

The efficiencies of dimer-based devices still lag those of their small molecule-based counterparts. This is primarily due to the considerable dihedrals in the dimer skeleton, which compromises the molecular packing, thus influencing the charge generation and nonradiative voltage loss (Δ V oc, nr ). Herein, we developed two dimeric acceptors with varied π-linkers to investigate the influence of linker-induced conformational lock on Δ V oc, nr . We find that the helically lapped O -shaped dimer delivers better intermolecular packing than the planar S -shaped one that incorporates a bulkier π-linker. However, its planar skeleton is instead more favorable for forming a compact and ordered stacking with the host acceptor in ternary blend. This possibly promotes exciton dissociation, thus reducing the nonradiative decay of excited states. Moreover, its longer exciton lifetime could offer additional charge-transfer channels. These contributions effectively minimize Δ V oc, nr to 0.195 eV, while delivering a high efficiency approaching 20% in the derived ternary device.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Organic Electronics and Photovoltaics · Silicon and Solar Cell Technologies · Thin-Film Transistor Technologies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

College of New Energy

Xi’an Shiyou University

Department of Material Science & Engineering

City University of Hong Kong

Department of Chemistry

School of Chemical Engineering, State Key Laboratory of Polymer Materials Engineering

Sichuan University

Institute of New Energy Technology, College of Physics and Optoelectronic Engineering

Jinan University

National Synchrotron Light Source (NSLS II)

Brookhaven National Laboratory

School of Materials Science and Engineering, National Institute for Advanced Materials

Nankai University

College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering

State Key Laboratory of Marine Pollution

Funding

Environment and Ecology Bureau · Research Grants Council, University Grants Committee · Basic and Applied Basic Research Foundation of Guangdong Province · Innovation and Technology Commission · City University of Hong Kong · Ministry of Human Resources and Social Security · Xi'an Association for Science and Technology · Guangzhou Huangpu Technology Bureau

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