Alkoxy side-chain engineering of quinquethiophene-based fully non-fused ring acceptors with near-infrared absorption for efficient organic solar cells

IF 4.1 3区工程技术 Q2 CHEMISTRY, APPLIED

Dyes and Pigments Pub Date : 2025-06-11 DOI:10.1016/j.dyepig.2025.112954

Siyuan Zang , Liying Dong , Jia Wang , Shuaiqi Wang , Xizhe Chu , Bofang Shan , Peng Yang , Zhigang Ni , Bin Kan , Qian Zhang

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引用次数: 0

Abstract

Fully non-fused organic semiconductors with ultra-narrow bandgap offer exceptional potential for cost-effective organic photoelectric devices. Here, two quinquethiophene-based fully non-fused acceptors, 5T-OEH and 5T-2OEH, were designed and synthesized by varying the number of the alkoxy chain on the terminal thiophene. The inner alkoxy modified 5T-OEH adopts a more planar backbone and displays a redshifted absorption with an ultra-narrow optical bandgap of 1.29 eV compared to 5T-2OEH. After blending with donor D18, the 5T-OEH blend exhibits a preferential face-on molecular orientation, more compact intermolecular stacking and favorable phase separation. Consequently, organic solar cells (OSCs) based on 5T-OEH afforded a power conversion efficiency (PCE) of 12.64 %, surpassing those based on 5T-2OEH (7.44 %). This study underscores the effectiveness of alkoxy chain engineering in optimizing the performance of non-fused acceptors, providing a promising pathway for advancing low-cost and high-efficiency OSCs toward commercialization.

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高效有机太阳能电池中具有近红外吸收的五环埃塞俄比亚烯基全不熔环受体烷氧基侧链工程

具有超窄带隙的完全非熔合有机半导体为具有成本效益的有机光电器件提供了非凡的潜力。本文通过改变末端噻吩上烷氧链的数目，设计并合成了5T-OEH和5T-2OEH两种基于五噻吩的完全不融合受体。与5T-2OEH相比，内烷氧基修饰的5T-OEH采用更平面的骨架，表现出红移吸收，光学带隙超窄，为1.29 eV。与给体D18共混后，5T-OEH共混物表现出优先的面朝分子取向、更致密的分子间堆积和良好的相分离。因此，基于5T-OEH的有机太阳能电池（OSCs）的功率转换效率（PCE）为12.64%，超过了基于5T-2OEH的有机太阳能电池（7.44%）。这项研究强调了烷氧基链工程在优化非融合受体性能方面的有效性，为推进低成本、高效率的OSCs商业化提供了一条有希望的途径。

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来源期刊

Dyes and Pigments 工程技术-材料科学：纺织

CiteScore

8.20

自引率

13.30%

发文量

933

审稿时长

33 days

期刊介绍： Dyes and Pigments covers the scientific and technical aspects of the chemistry and physics of dyes, pigments and their intermediates. Emphasis is placed on the properties of the colouring matters themselves rather than on their applications or the system in which they may be applied. Thus the journal accepts research and review papers on the synthesis of dyes, pigments and intermediates, their physical or chemical properties, e.g. spectroscopic, surface, solution or solid state characteristics, the physical aspects of their preparation, e.g. precipitation, nucleation and growth, crystal formation, liquid crystalline characteristics, their photochemical, ecological or biological properties and the relationship between colour and chemical constitution. However, papers are considered which deal with the more fundamental aspects of colourant application and of the interactions of colourants with substrates or media. The journal will interest a wide variety of workers in a range of disciplines whose work involves dyes, pigments and their intermediates, and provides a platform for investigators with common interests but diverse fields of activity such as cosmetics, reprographics, dye and pigment synthesis, medical research, polymers, etc.