Fabrication of Dye-Sensitized Solar Cells by Using Self-Assembled Electrodeposition

我们在0.1MZnNO_3溶液或含10-50μM染料的0.1MKCl +5mMZnCl_2溶液中阴极存款了纳米多孔ZnO/染料杂化薄膜。在-1.0V（vs.SCE）下，从含曙红Y染料的镀液中沉积的膜由海绵状单晶组成，其上吸附有曙红Y分子。利用旋转圆盘电极对ZnO/染料杂化薄膜的生长动力学进行了分析，得出了具有这种独特微结构的ZnO/染料杂化薄膜是在阴极化的曙红Y、Zn^2+离子和溶解氧的相互作用下以自组装方式生长的结论。将由此获得的ZnO/eosinY膜浸入稀碱性溶液中，eosinY分子被解吸而不引起ZnO晶体的任何变化。利用这些纳米多孔ZnO薄膜作为模板材料，我们成功地得到了各种染料的ZnO薄膜浸渍在这些染料溶液。用曙红Y或香豆素343染料改性的膜，从而获得的解吸，然后再吸附表现出非常高的入射光子电流转换效率约90%。由于这些工艺在低于100℃的温度下进行，因此适用于导电塑料基板。这些结果有望实现薄膜型彩色太阳能电池。

We have succeeded to deposit nano-porous ZnO/dye hybrid films by cathodizing a substrate in 0.1M ZnNO_3 solution or O_2-bublled 0.1M KCl+5mM ZnCl_2 bath containing various dyes with concentration of 10-50μM. The films deposited at -1.0V (vs.SCE) from baths containing eosinY dye have been found to be composed of sponge-like single crystals, on which eosinY molecules are adsorbed. By using a rotating disk electrode, we have analyzed kinetics of the ZnO/dye hybrid films and concluded that the films with such a unique microstructure are formed under the interaction of cathodized eosinY, Zn^<2+> ion and dissolved oxygen in the self-assembled growth manner. Dipping ZnO/eosinY films thus obtained into a diluted alkaline solution, eosinY molecules are desorbed without causing any change in ZnO crystals. By utilizing these nano-porous ZnO films as template materials, we have succeeded to get ZnO films modified with various dyes by dipping into those dye solutions. The films modified with eosinY or coumarine343 dyes thus obtained by the desorption followed by the re-adsorption exhibit very high incident photon to current conversion efficiencies around 90%. As these processes are carried out at temperatures lower than 100℃, this is applicable to a conductive plastic substrate. These results promise a realization of the film-type colorful solar cells.