journal article·2024-06

Eliminating the Burn‐in Loss of Efficiency in Organic Solar Cells by Applying Dimer Acceptors as Supramolecular Stabilizers

Yanxun Li, Feng Qi, Baobing Fan, Kai‐Kai Liu, Jifa Yu, Yuang Fu, Xianzhao Liu, Zhen Wang, Sen Zhang, Guanghao Lu, Xinhui Lu, Qunping Fan, Philip C. Y. Chow, Wei Ma, Francis R. Lin, Alex K.‐Y. Jen

Advanced Materials· Volume 36· Issue 23
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Abstract

Abstract The meta‐stable active layer morphology of organic solar cells (OSCs) is identified as the main cause of the rapid burn‐in loss of power conversion efficiency (PCE) during long‐term device operation. However, effective strategies to eliminate the associated loss mechanisms from the initial stage of device operation are still lacking, especially for high‐efficiency material systems. Herein, the introduction of molecularly engineered dimer acceptors with adjustable thermal transition properties into the active layer of OSCs to serve as supramolecular stabilizers for regulating the thermal transitions and optimizing the crystallization of the absorber composites is reported. By establishing intimate π‐π interactions with small‐molecule acceptors, these stabilizers can effectively reduce the trap‐state density (Nt) in the devices to achieve excellent PCEs over 19%. More importantly, the low Nt associated with an initially optimized morphology can be maintained under external stresses to significantly reduce the PCE burn‐in loss in devices. This research reveals a judicious approach to improving OPV stability by establishing a comprehensive correlation between material properties, active‐layer morphology, and device performance, for developing burn‐in‐free OSCs.
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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 Materials Science & Engineering City University of Hong Kong Kowloon Hong Kong 999077 China

Hong Kong Institute for Clean Energy City University of Hong Kong Kowloon Hong Kong 999077 China

Department of Chemistry City University of Hong Kong Kowloon Hong Kong 999077 China

College of Materials Science and Engineering Qingdao University Qingdao 266071 P. R. China

Frontier Institute of Science and Technology Xi'an Jiaotong University Xi'an 710054 China

Department of Physics The Chinese University of Hong Kong New Territories Hong Kong 999077 China

Department of Mechanical Engineering The University of Hong Kong Pokfulam Hong Kong 999077 China

State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China

Department of Materials Science & Engineering University of Washington Seattle WA 98195 USA

State Key Laboratory of Marine Pollution City University of Hong Kong Kowloon Hong Kong 999077 China

Funding

City University of Hong Kong · Glaucoma Research Foundation · Shenzhen Science and Technology Innovation Program

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