Citation: HAO Xue-Liang, ZHAO Jin-Ge, GAO Jian-Rong, HAN Liang. Synthesis and Photoelectric Properties of Carbazole Sensitizing Dyes Based on a Benzoic Acid Acceptor[J]. Acta Physico-Chimica Sinica, 2015, 31(10): 1977-1984. doi: 10.3866/PKU.WHXB201509075
基于苯甲酸受体的咔唑染料敏化剂的合成和光电性能
选择N-正丁基咔唑作为电子给体, 芴酮作为桥键, 苯甲酸作为受体, 通过桥键芴酮与给体和受体连接位置的改变, 设计合成了两个咔唑染料4-(6-(N-正丁基咔唑-3-基)-9-氧-9H-芴-3-基)苯甲酸(HXL-3W)和4-(7-(N-正丁基咔唑-3-基)-9-氧-9H-芴-2-基)苯甲酸(HXL-4Z). 对咔唑染料的光谱性能、电化学性能和光电转换性能进行了研究, 并运用密度泛函理论(DFT)方法对其几何结构和紫外-可见光谱进行了优化计算. 结果表明, HXL-4Z的吸收光谱呈现两个明显的π→π*跃迁吸收峰和一个较小的对应于分子内电荷转移的吸收峰, 而HXL-3W的吸收光谱则仅呈现一个π→π*跃迁吸收峰, 且摩尔吸光系数远小于HXL-4Z. 可能是HXL-3W分子结构中给体和受体距离较近, 张力较大, 导致较差的分子平面性和分子内电荷转移. 因而HXL-4Z的光吸收能力和电子注入效率较优, 从而具有较好的光电转换效率(2.03%) (短路电流(JSC) = 3.88 mA·cm-2, 开路电压(VOC) = 700 mV, 填充因子(FF) = 0.75).
English
Synthesis and Photoelectric Properties of Carbazole Sensitizing Dyes Based on a Benzoic Acid Acceptor
4-(6-(N-butylcarbazole-3-yl)-9-oxo-9H-fluoren-3-yl)benzoic acid (HXL-3W) and 4-(7-(Nbutylcarbazole-3-yl)-9-oxo-9H-fluoren-2-yl)benzoic acid (HXL-4Z), were designed and synthesized through the linking position variation of the fluorenone π-bridge with the N-butylcarbazole donor and a benzoic acid acceptor. The spectra, electrochemistry and photoelectric conversion properties of these carbazole dyes were investigated and their geometric structure and UV-Vis spectra were optimized and calculated using the density functional theory (DFT) method. The results show two distinct absorption peaks, ascribed to the π→π* transition, along with a small peak corresponding to intramolecular charge transfer in the absorption spectrum of HXL-4Z. However, only one π→π* transition absorption peak is found in the spectrum of HXL-3W and its molar extinction coefficient is far smaller than that of HXL-4Z. The reason for this may be a closer distance between the donor and acceptor of HXL-3W leading to a large tension, causing inferior molecular planarity and intramolecular charge transfer. Therefore, HXL-4Z which possesses superior light absorptivity and electron injection efficiency, shows an enhanced photoelectric conversion efficiency of 2.03% (short-circuit photocurrent density (Jsc) = 3.88 mA·cm-2, open-circuit photovoltage (Voc) = 700 mV, fill factor (FF) = 0.75).
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Key words:
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Carbazole
- / Sensitizing dye
- / Benzoic acid acceptor
- / Synthesis
- / Photoelectric property
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