Dinçalp Haluk, Saltan Gözde Murat, Aykut Deniz, Zafer Ceylan
Department of Chemistry, Faculty of Arts and Science, Celal Bayar University, Yunus Emre, 45140 Manisa, Turkey.
Department of Chemistry, Faculty of Arts and Science, Celal Bayar University, Yunus Emre, 45140 Manisa, Turkey.
Spectrochim Acta A Mol Biomol Spectrosc. 2015 Oct 5;149:157-65. doi: 10.1016/j.saa.2015.04.074. Epub 2015 Apr 29.
New triphenylamine-benzimidazole type small molecules with different electron-releasing groups were designed and synthesized to investigate their photovoltaic performances in dye sensitized solar cells (DSSCs). Their good visible absorptions covering the 400-535 nm in addition to suitable lowest unoccupied molecular orbital (LUMO) energy levels between -3.03 and -3.11 eV make good candidates them for DSSC devices. Fluorescence quenching studies of the dyes with pristine titania support the good electron injection to conduction band of TiO2. Time resolved measurements of the dyes in solutions indicate the occurence of charge generation during the excited state. One of the used dyes in DSSC devices, TPA5a, carrying a methoxy group in triphenylamine part of the structure, gave much higher power conversion efficiency (PCE) value of 4.31% as compared to the other derivatives. Device fabricated from TPA5a dye gives good external quantum efficiency (EQE) value above 70% at 460 nm. Also, electron impedance spectroscopy (EIS) analysis of the devices gives a good explanation of the understanding of the cell performances.
设计并合成了带有不同供电子基团的新型三苯胺-苯并咪唑类小分子，以研究其在染料敏化太阳能电池（DSSC）中的光伏性能。它们在400-535nm范围内具有良好的可见光吸收，并且最低未占据分子轨道（LUMO）能级在-3.03至-3.11eV之间，这使其成为DSSC器件的良好候选材料。染料与原始二氧化钛的荧光猝灭研究支持了向TiO2导带的良好电子注入。溶液中染料的时间分辨测量表明在激发态期间发生了电荷产生。DSSC器件中使用的一种染料TPA5a，在结构的三苯胺部分带有甲氧基，与其他衍生物相比，其功率转换效率（PCE）值高达4.31%。由TPA5a染料制成的器件在460nm处具有高于70%的良好外量子效率（EQE）值。此外，器件的电子阻抗谱（EIS）分析很好地解释了对电池性能的理解。
