基于星型三苯胺小分子给体材料的合成及性能研究
Design and Properties of Star-Shaped Organic Small Molecule Donors Based on Triphenylamine
DOI: 10.12677/ms.2025.1511211, PDF,    科研立项经费支持
作者: 殷志红*, 吴昊哲, 刘 柳, 彭天英, 游一兰：湖南城市学院材料与化学工程学院，湖南 益阳
关键词: 三苯胺；小分子给体；星型结构；有机太阳能电池；Triphenylamine； Small Molecule Donor； Star-Shaped Structure； Organic Solar Cells
摘要: 星型小分子由于具有三维电荷传输特性、强光捕获能力和易于调节的能级，在有机太阳能电池(OSCs)中引起了极大的关注。以星型三苯胺(TPA)为中心骨架，桥连不同烷基噻吩为π桥，通过改变端基单元，设计合成了一系列星型A-π-D-π-A型小分子给体材料(TPA-SEHC2、TPA-SEHC4、TPA-SEHC6、TPA-SEHCNC6、TPA-SC2、TPA-SC4、TPA-SC6以及TPA-SCNC6)。通过紫外-可见吸收光谱和循环伏安法研究了它们光学和电化学性质。测试结果表明：8个小分子给体材料的吸收范围相差不大，其中TPA-SEHC4和TPA-SC4小分子给体材料的最高分子占有轨道(HOMO)能级更低(−5.56 eV和−5.57 eV)。以富勒烯PCBM为受体，8种小分子给体材料为给体分别共混制备了本体异质结有机光伏器件。其中基于TPA-SEHCNC6材料制备的器件获得了最高的光电转换效率(PCE)为1.09%，而基于TPA-SEHC4和TPA-SC4获得了较高的开路电压(VOC)分别为0.92 V和0.93 V，但其PCE为0.32%和0.78%。本研究为用于高效有机太阳能电池的星型小分子给体材料提供了有效的策略。
Abstract: Star-shaped small molecules have attracted great attention for organic solar cells (OSCs) because they have three-dimensional charge-transport characteristics, strong light absorption capacities and easily tunable energy levels. In this work, we design a series of A-π-D-π-A type star-shaped small molecule donor materials (TPA-SEHC2, TPA-SEHC4, TPA-SEHC6, TPA-SEHCNC6, TPA-SC2, TPA-SC4, TPA-SC6 and TPA-SCNC6), based on the star-shaped triphenylamine (TPA) as the core framework, with different alkyl-thiophenes bridging each other as π bridges for altering the electron-deficient terminal units. The ultraviolet-visible (UV-vis) spectra and cyclic voltammetry (CV) are utilized to explore their optical and electrochemical performance, showing similar absorption region between the above donor materials, and exhibiting lower highest molecular orbital (HOMO) energy level (−5.56 eV and −5.57 eV) of TPA-SEHC4 and TPA-SC4 small molecule donor materials. Then, intrinsic heterojunction organic photovoltaic devices were fabricated, by blending fullerene PCBM as the acceptor and small molecule donor materials as the donor. The device fabricated using TPA-SEHCNC6 material achieved the highest photoelectric conversion efficiency (PCE) of 1.09%, while the devices based on TPA-SEHC4 and TPA-SC4 obtained higher open-circuit voltages (VOC) of 0.92 V and 0.93 V respectively, but their PCE was 0.32% and 0.78% respectively. This study provides an effective strategy for star-shaped small molecule donor materials for high-efficiency organic solar cells.
文章引用：殷志红, 吴昊哲, 刘柳, 彭天英, 游一兰. 基于星型三苯胺小分子给体材料的合成及性能研究[J]. 材料科学, 2025, 15(11): 1989-1999. https://doi.org/10.12677/ms.2025.1511211

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