Quinoxaline based A-A type polymer donors for non-fullerene polymer solar cells

IF 4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Synthetic Metals Pub Date : 2024-10-22 DOI:10.1016/j.synthmet.2024.117773
Xingjian Jiang, Ming Liu, Daizhe Wang, Yong Zhang
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Abstract

In this study, we designed and synthesized two polymers, PDFBT-Qx and PDTBT-Qx, using the quinoxaline unit containing a long alkyl side chain as an unit and DTBT with or without fluorine atom as the other unit, respectively. The optical and electrochemical properties of the above two polymer donors were studied, and the optical bandgaps of PDTBT-Qx and PDFBT-Qx were 1.59 eV and 1.69 eV, respectively. The optical and electrochemical properties of the above two polymer donors were studied, and the HOMO and LUMO energy levels of PDTBT-Qx and PDFBT-Qx were obtained, and the energy levels of L8-BO were compared to explore the feasibility of the study. Polymer solar cells (PSCs) were prepared by blending with the non-fullerene acceptor material L8-BO. Finally, it was found that the power conversion efficiency (PCE) based on PDFBT-Qx:L8-BO and PDTBT-Qx:L8-BO was 7.2 % and 3.5 %, respectively. The systematic analysis of the optical properties, electronic energy level, charge transport, photovoltaic performance, charge dissociation efficiency and surface morphology of the material shows that the F atom can not only reduce the HOMO energy level of the donor material to improve the VOC of the device due to its huge electronegativity. Furthermore, when the fluorine atom is introduced into the polymer skeleton, it can form weak intermolecular forces (F—S) with the sulfur atom in DTBT. This fluorination strategy can enhance the rigidity of the polymer and is known as “the molecular lock effect”. This phenomenon is conducive to adjusting the morphology of the active layer and ultimately improving the efficiency of the device.
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用于非富勒烯聚合物太阳能电池的基于喹喔啉的 A-A 型聚合物供体
本研究以含有长烷基侧链的喹喔啉单元为一个单元,以含有或不含氟原子的 DTBT 为另一个单元,设计并合成了两种聚合物:PDFBT-Qx 和 PDTBT-Qx。研究了上述两种聚合物供体的光学和电化学性质,发现 PDTBT-Qx 和 PDFBT-Qx 的光带隙分别为 1.59 eV 和 1.69 eV。研究了上述两种聚合物给体的光学和电化学性质,得到了 PDTBT-Qx 和 PDFBT-Qx 的 HOMO 和 LUMO 能级,并比较了 L8-BO 的能级,探讨了研究的可行性。通过与非富勒烯受体材料 L8-BO 混合制备了聚合物太阳能电池(PSCs)。最后发现,基于 PDFBT-Qx:L8-BO 和 PDTBT-Qx:L8-BO 的功率转换效率(PCE)分别为 7.2 % 和 3.5 %。对材料的光学性质、电子能级、电荷传输、光伏性能、电荷解离效率和表面形貌的系统分析表明,由于氟原子具有巨大的电负性,它不仅可以降低供体材料的 HOMO 能级,从而提高器件的 VOC。此外,当氟原子被引入聚合物骨架时,它还能与 DTBT 中的硫原子形成微弱的分子间作用力(F-S)。这种氟化策略可以增强聚合物的刚性,被称为 "分子锁定效应"。这种现象有利于调整活性层的形态,最终提高器件的效率。
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来源期刊
Synthetic Metals
Synthetic Metals 工程技术-材料科学:综合
CiteScore
8.30
自引率
4.50%
发文量
189
审稿时长
33 days
期刊介绍: This journal is an international medium for the rapid publication of original research papers, short communications and subject reviews dealing with research on and applications of electronic polymers and electronic molecular materials including novel carbon architectures. These functional materials have the properties of metals, semiconductors or magnets and are distinguishable from elemental and alloy/binary metals, semiconductors and magnets.
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