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选择带有供电子基团的香豆素作为给体,噻吩基作为桥键,氰乙酸为受体,合成了两种新的具有“D-π-A”结构的香豆素型染料敏化剂,对其光谱性能、电化学性能以及光电转换性能进行了测试.结果表明,两者分子轨道能级与TiO2电极的导带以及电解质I2/I-的氧化还原电位相匹配,保证了电池电流循环的顺利产生.与甲氧基取代的染料敏化剂2-氰基-3-[5-(7-甲氧基-2-羰基-2H-苯并吡喃-3-基)噻吩-2-基]丙烯酸(IIIb)相比,香豆素环7位上二乙氨基取代的染料敏化剂2-氰基-3-[5-(7-二乙胺基-2-羰基-2H-苯并吡喃-3-基)噻吩-2-基]丙烯酸(IIIa)分子内电荷转移吸收较强,紫外吸收光谱红移.IIIa组装得到的染料敏化太阳能电池暗电流降低,具有较高的单色光转化效率IPCE(incident photo-to-currentconversion efficient)和短路电流Jsc,从而具有较高的光电转换效率(Jsc=8.68 mA/cm2,Voc=574 mV,η=3.52%).
A new coumarin-type dye with “D-π-A” structure was synthesized by using coumarin with electron donating group as donor, thienyl as bridge and cyanoacetate as acceptor The results showed that the molecular orbital energy levels of the two were matched with the conduction band of TiO2 electrode and the redox potential of electrolyte I2 / I-, which ensured that The battery current cycle smoothly produced with the methoxy-substituted dye sensitizer 2-cyano-3- [5- (7-methoxy-2-carbonyl-2H-benzopyran-3-yl) thiophene (5- (7-diethylamino-2-oxo-pyrimidin-2-yl) 2H-benzopyran-3-yl) thiophen-2-yl] acrylic acid (IIIa) showed strong intramolecular charge transfer and red shift of ultraviolet absorption spectra. The dye-sensitized solar cell assembled by IIIa had a dark current reduced, (Jsc = 8.68 mA / cm2, Voc = 574 mV, η = 3.52%) with high single-color conversion efficiency IPCE (incident photo-to-current conversion efficient) and short-circuit current Jsc.