journal article·2025-04Open access

Triplet State Suppression for Energy Loss Reduction in 20% Nonhalogenated Solvent Processed Binary Organic Solar Cells

Ruijie Ma, Bosen Zou, Yulong Hai, Yongmin Luo, Zhenghui Luo, Jiaying Wu, He Yan, Gang Li

Advanced Materials· Volume 37· Issue 17

Abstract

Abstract Boosting power conversion efficiency (PCE) of organic solar cells (OSCs) has been restricted by its undesirably high energy loss, especially for those nonhalogenated solvent‐processed ones. Here,a dichloro‐methoxylated terminal group in an asymmetric small molecular acceptor design, which realizes a significantly reduced non‐radiative energy loss (0.179 eV) compared to its symmetric counterpart (0.202 eV), is reported. Consequently, the device efficiency is improved by up to 20% for PM6:BTP‐eC9‐4ClO, without sacrificing the photon harvest or charge transport ability of the control system PM6:BTP‐eC9. Further characterizations reveal the asymmetric acceptor BTP‐eC9‐4ClO's blend film demonstrates a suppressed triplet state formation, enabled by an enhanced electron delocalization. In addition, the asymmetric BTP‐eC9‐4ClO is found to be thermally stabler than BTP‐eC9, and thus providing an improved device stability, whose T80 value reaches > 7800 h under 80 °C anneal in N2 via linear extrapolation. This work represents state‐of‐the‐art device performance for nonhalogenated solvent‐processed binary OSCs with certified results (19.45%).
Source: crossref · Quality: baseline

Research context

OpenAlex topics: Organic Electronics and Photovoltaics · Conducting polymers and applications · Perovskite Materials and Applications

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

Affiliations

Department of Electrical and Electronic Engineering Research Institute for Smart Energy (RISE) Photonic Research Institute (PRI) The Hong Kong Polytechnic University Hong Kong 999077 China

Department of Chemistry Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction The Hong Kong University of Science and Technology Clear Water Bay Hong Kong 999077 China

The Hong Kong University of Science and Technology (Guangzhou) Function Hub Advanced Materials Thrust Nansha Guangzhou 511400 China

Guangdong Provincial Key Laboratory of New Energy Materials Service Safety Shenzhen Key Laboratory of New Information Display and Storage Materials College of Materials Science and Engineering Shenzhen University Shenzhen 518060 China

Funding

Science, Technology and Innovation Commission of Shenzhen Municipality · Guangdong Provincial Department of Science and Technology · Paleontological Research Institution · Shenzhen Science and Technology Innovation Program · National Natural Science Foundation of China

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