Metal-assembling dendrimers with a triarylamine core and their application to a dye-sensitized solar cell.
Metal-assembling dendrimers with a triarylamine core and their application to a dye-sensitized solar cell.
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DOI：
10.1021/ja050765c
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发表时间：
2005-08
影响因子：
15
通讯作者：
Norifusa Satoh;Toshio Nakashima;Kimihisa Yamamoto
中科院分区：
文献类型：
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作者：
Norifusa Satoh;Toshio Nakashima;Kimihisa Yamamoto
制备了一系列具有电荷分离和空穴传输功能的三芳胺苯甲亚胺树枝状聚合物，并对其作为染料敏化太阳能电池（DSSC）中的电荷分离剂进行了评价。采用收敛法合成了五代树状结构的苯甲亚胺-三苯胺（TPA-DPA）。所得树枝状聚合物具有类似于球状蛋白质的刚性球体结构，流体动力学半径为2.43 nm。TPA核的电化学氧化揭示了树枝状聚合物中的树枝状单元在电子转移中具有0.35的衰减因子（β）。TPA-DPA与SnCl 2的络合以逐步的方式从核到末端亚胺，遵循每个树枝化基元壳中亚胺基团之间的碱度梯度进行。通过将这些树枝状大分子浇铸到染料敏化的TiO 2薄膜上制备的DSSC通过抑制背电子转移表现出比裸膜更高的开路电压。树枝状分子的世代生长增加了树枝状分子的半径，导致与I3-的更强的关联和更高的开路电压，随着世代的增加。与SnCl 2的络合降低了TPA-DPA的电阻并提高了填充因子。使用第五代TPA-DPA制备的DSSC的能量转换效率比裸膜高21%，当与SnCl 2络合时，提供了34%的提高。
A series of charge-separable and hole-transporting phenylazomethine dendrimers with a triarylamine core are prepared and evaluated for use as a charge separator in dye-sensitized solar cells (DSSCs). Triphenylamine with dendric phenylazomethine (TPA-DPA) is prepared by synthesizing up to five generations of dendrons using a convergent method. The resultant dendrimer has a rigid sphere structure similar to globular protein, with a hydrodynamic radius of 2.43 nm. Electrochemical oxidation of the TPA core reveals that the dendron units in the dendrimer have 0.35 of the attenuation factor (beta) in the electron transfer. Complexation of TPA-DPA with SnCl2 proceeds in stepwise fashion from the core to the terminal imine following the basicity gradient among imine groups in each dendron shell. DSSCs prepared by casting these dendrimers onto dye-sensitized TiO2 film exhibited a higher open-circuit voltage than the bare film through the suppression of back electron transfer. The generational growth of dendrons increases the radius of the dendrimer, resulting in a stronger association with I3- and higher open-circuit voltage with an increasing number of generations. Complexation with SnCl2 reduces the resistance of TPA-DPA and improves the fill factor. The energy conversion efficiency of the DSSC prepared using fifth-generation TPA-DPA is 21% higher than that for the bare film and, when complexed with SnCl2, provides a 34% improvement.