菁类染料敏化的固态纳米TiO2光电化学电池

染料敏化TiO2光电化学电池具有较高的能量转换效率，价格仅为传统单晶硅太阳能电池的1／10，成为半导体光电化学领域的研究热点^1-4]。但该类电池内的电解液可流动，造成电池密封困难，限制其实用化。针对这一问题，采用无机p-型半导体材料^5,6]和高分子导体等电解液替代物组装固态光电化学电池成为该领域的新的研究方向^7-9]。我们^10]用凝胶网络高分子电解质组装成固态电池，取得了令人满意的结果。电池中原使用的敏化剂是顺二硫氰根－双（2，2′－联吡啶－4，4′－二羧酸）合钌（Ⅱ）(cis-bis)(thiocyanato)bis(2,2′-bipyridyl-4,4′-dicarboxylate)ruthenium(Ⅱ），其价格昂贵，合成路线复杂。本文用自合成的、价格低廉的纯有机不对称菁类染料（Cyanine dye,以下简称为CD）敏化TiO2电极和基于聚氧乙烯（PEO）的凝胶网络高分子电解质组装成固态电池，并研究了所得固态电池的光电转换性能。

A Solid-state Unsymmetrical Cyanine Dye Sensitized Nanoporous TiO2 Photoelectrochemical Cell

A novel unsymmetrical cyanine dye(noted as CD) was applied to dye sensitized nanoporous TiO 2 photoelectrochemical cells. The incident photon to electron conversion efficiency up to 84 34% was achieved, which is notably high for cells employing pure organic dyes. To circumvent the sealing difficulties present in wet type cells, the solid state cell was fabricated using poly(ethyleneoxide)(PEO) based gel network polymer electrolyte as charge transfer material between two electrodes. The resulting solid state cell had an energy conversion efficiency of 0 86%, with open circuit voltage of 0 53 V and short circuit current density of 0 96 mA/cm 2 under 38 1 mW/cm 2 white light illumination. The results show that the gel network polymer electrolyte is appropriate for assembling solid state photoelectrochemical cells.