The effect of π-bridge in D-π-A type polymer donor on the photovoltaic performance of organic solar cells with different types of electron acceptors

IF 4.2 3区工程技术 Q2 CHEMISTRY, APPLIED

Dyes and Pigments Pub Date : 2025-06-14 DOI:10.1016/j.dyepig.2025.112955

Yunfeng Xu , Chao Meng , Peiqing Cong , Mengzhen Du , Jimin Du , Shenghuang Lin , Ailing Tang , Erjun Zhou

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Abstract

Changing π-bridge in D-π-A type polymer from thiophene to thieno[3,2-b]thiophene (TT) is an effective molecular engineering to modulate the optoelectronic properties of polymers. However, for two different types of electron acceptors, small molecule and polymer, the specific effects of π-bridge engineering have not yet been studied. Herein, two benzotriazole (BTA)-based donor polymers J52-F and PE3, are used to investigate the effect in the varying electron acceptors: small molecule acceptor Y6 and the polymer acceptor N2200. PE3 shows superior molecular compatibility with Y6 rather than N2200, while in the J52 system, it's the opposite. As a result, J52-F: N2200 and PE3: Y6 blends give rise to interpenetrating network morphology with a better domain size than their counterparts, enhancing charge transport and suppressing charge recombination. Compared with J52-F: N2200, PE3:N2200 exhibits increased radiative recombination loss due to the poor energy disorder, producing a similar open-circuit voltage (V_OC) with J52:N2200. In the Y6 system, PE3 produces lower radiative and non-radiative energy loss than J52-F, leading to a higher V_OC. Finally, the PE3:Y6 achieves the highest PCE of 16.63 %, obviously higher than the J52-F: Y6 (PCE = 12.75 %). Differently, in the N2200-based all-polymer solar cells, J52-F exhibits a better PCE of 8.99 % than PE3 (PCE = 3.75 %). These data demonstrate that introducing TT bridge is a prospective way of constructing high-efficiency Y6-based photovoltaic devices due to the superior molecular compatibility.

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D-π-A型聚合物给体中π桥对不同类型电子受体有机太阳能电池光电性能的影响

将D-π-A型聚合物中的π桥由噻吩转变为噻吩[3,2-b]噻吩（TT）是一种有效的调节聚合物光电性能的分子工程。然而，对于小分子和聚合物两种不同类型的电子受体，π桥工程的具体效果尚未研究。本文采用两种基于苯并三唑（BTA）的给体聚合物J52-F和PE3，研究了不同电子受体（小分子受体Y6和聚合物受体N2200）的影响。PE3与Y6的分子相容性优于N2200，而在J52体系中则相反。结果表明，J52-F: N2200和PE3: Y6共混体系形成了互穿的网状结构，具有更好的畴大小，增强了电荷输运，抑制了电荷复合。与J52- f:N2200相比，PE3:N2200由于能量无序性差，导致辐射复合损耗增加，产生与J52:N2200相似的开路电压（VOC）。在Y6体系中，PE3产生的辐射和非辐射能量损失比J52-F低，导致VOC更高。最后，PE3:Y6的PCE最高，为16.63%，明显高于J52-F: Y6 （PCE = 12.75%）。不同的是，在n2200基全聚合物太阳能电池中，J52-F的PCE为8.99%，优于PE3 （PCE = 3.75%）。这些数据表明，由于优越的分子相容性，引入TT桥是构建高效y6基光伏器件的一种有前景的方法。

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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.