聚合物方酸菁染料作为体异质结太阳能电池的电子给体
Polymeric Squaraine Dyes as Electron Donors in Bulk Heterojunction Solar Cells
摘要：
以二溴吲哚啉方酸染料为单体，通过Yamamoto偶联合成了聚方酸低带隙聚合物。所得聚合物的重均摩尔质量约为Mw ~30.000-50.000，多分散性约为Mw ~ 30.000。1.7通过凝胶渗透色谱法（GPC）测定。用循环伏安法、吸收光谱和发射光谱研究了单体和聚合物的电子性质。与单体方酸染料相比，由于激子耦合，聚合物的吸收带发生红移并强烈增宽。将聚方酸与富勒烯衍生物[6，6]-苯基C61-丁酸甲酯（PCBM）以不同的重量比（1：3至1：1）共混制备了体异质结太阳能电池。在模拟AM 1.5条件下，这些非优化系统的功率转换效率为0.45%。外量子效率（EQE）表明，其光响应范围为300 ~ 850 nm，说明了这种新型有机半导体作为一种低带隙给体材料在有机光致发光中具有良好的应用前景。
英文摘要：
A polysquaraine low band gap polymer was synthesized by Yamamoto coupling of a monomeric dibromo indolenine squaraine dye. The resulting polymer has a weight average molar mass in the order of Mw ~30.000-50.000 and a polydispersity of ca. 1.7 as determined by gel-permeation chromatography (GPC). The electronic properties of monomer and polymer were investigated by cyclic voltammetry, absorption and emission spectroscopy. Owing to exciton coupling the absorption bands of the polymer are red-shifted and strongly broadened compared to the monomer squaraine dye. Bulk heterojunction solar cells were prepared from blends of the polysquaraine with the fullerene derivative [6,6]-phenyl C61-butyric acid methyl ester (PCBM) in different weight ratios (1:3 to 1:1). The power conversion efficiencies under simulated AM 1.5 conditions yielded 0.45 % for these non-optimized systems. The external quantum efficiency (EQE) shows that the photoresponse spans the range from 300 to 850 nm, which illustrates the promising properties of this novel organic semiconductor as a low band gap donor material in organic photovoltaics.
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