Quasi-Solid Dye Sensitized Solar Cell with Straight Ion Paths Proposal of Hybrid Electrolytes for Ionic Liquid-Type Electrolytes
Quasi-Solid Dye Sensitized Solar Cell with Straight Ion Paths Proposal of Hybrid Electrolytes for Ionic Liquid-Type Electrolytes
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DOI：
10.1149/1.2393008
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发表时间：
2007
影响因子：
3.9
通讯作者：
T. Kato;S. Hayase
中科院分区：
文献类型：
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作者：
T. Kato;S. Hayase
报道了具有直离子路径的准固体染料敏化太阳能电池(QDSC)。电池由阳极氧化氧化铝膜组成。离子液型电解液填充在直的纳米孔中，并夹在对电极和二氧化钛电极之间。即使在电化学不活跃的Al_2O_2壁占电解液层的50%时，I-3扩散系数和太阳电池的性能也与没有Al_2O_3层的相同。这与填充了氧化铝纳米颗粒和离子液体类型电解液混合物的电池的结果形成了对比，在离子液体类型的电解液中，离子路径是随机的。另外，用含甲基咪唑基团的长链烷基对氧化铝膜内壁进行化学修饰，可提高膜的光伏性能。这是由于在表面修饰的Al2 O3薄膜中存在沿排列的甲基咪唑基团的离子路径，其中I2(I-3)物种集中。表观Ij扩散系数的快速变化符合格洛特斯机制。由于I2物种集中在Al2 O3层的直孔中，因此TiO2层中I2(I-3)物种的浓度相对较低。这增加了约400 nm处的光在多孔二氧化钛层中的穿透深度，并提高了约400 nm处的入射光-电流转换效率。为提高离子液型QDSC的性能，提出了一种在多孔层中富碘(I-3)和在纳米孔中低浓度I2(I3)的复合电解质体系。
Quasi-solid dye sensitized solar cells (QDSC) with straight ion paths are reported. The cell consists of anodic oxidation Al 2 O 3 films. Ionic liquid-type electrolyte is filled in the straight nanopores and they are sandwiched between a counter electrode and a TiO 2 electrode. Even when electrochemically inactive Al 2 O 2 wall occupies 50% of the electrolyte layer, the I - 3 diffusion coefficient and solar cell performance are the same as those without the Al 2 O 3 layers. This contrasts the results of cells filled with the mixture of Al 2 O 3 nanoparticles and ionic liquid type electrolytes, where random ion paths are expected. In addition, when the inner wall of anodic oxidation Al 2 O 3 films is chemically modified with long alkyl groups bearing methylimidazolium moieties, the increase in photovoltaic performance is observed. This is explained by the existence of ion paths along aligned methylimidazolium moieties in the surface-modified Al 2 O 3 films, where I 2 (I - 3 ) species are concentrated. The swift apparent Ij diffusion coefficient is explained by Grotthuss mechanism. Because the I 2 species are concentrated in the straight pore of Al 2 O 3 layers, the concentration of I 2 (I - 3 ) species in TiO 2 layers is reduced relatively. This increases light penetration depth at around 400 nm in the porous TiO 2 layer and improves incident photon-to-current efficiency at around 400 nm. The hybrid electrolyte systems containing both of concentrated I 2 (I - 3 ) in a porous Al 2 O 3 layer and low concentration portions in nanopores in TiO 2 are proposed to increase ionic liquid-type QDSC.