Wet chemical route to hierarchical TiO2 nanodendrite/nanoparticle composite anodes for dye-sensitized solar cells
Wet chemical route to hierarchical TiO2 nanodendrite/nanoparticle composite anodes for dye-sensitized solar cells
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DOI：
10.1039/c1jm10105f
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发表时间：
2011-06
影响因子：
--
通讯作者：
Wen-Pin Liao;Jih-Jen Wu
中科院分区：
文献类型：
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作者：
Wen-Pin Liao;Jih-Jen Wu
在掺氟氧化锡（FTO）衬底上制备了金红石型TiO 2纳米枝晶（ND）/纳米颗粒（NP）复合薄膜，并用于染料敏化太阳能电池（DSSC）。金红石TiO 2 ND阵列首先来自FTO上的纳米线（NW）阵列，通过在不存在有机结构导向剂的情况下使用湿化学路线在TiO 2 NW的表面上生长分支。高分辨透射电子显微镜（HRTEM）表征表明，孪晶结构出现在边界的纳米线和分支。随后通过另一化学浴沉积在ND阵列的间隙内生长NP。当阳极厚度为3 μm时，金红石型TiO 2 ND/NP DSSC的效率上级优于P25 DSSC。虽然与P25阳极相比，在金红石型TiO 2 ND/NP阳极中观察到较慢的电子传输速率，但金红石型TiO 2 ND/NP阳极具有显著更大的电子寿命，因此具有上级扩散长度。
Hierarchical rutile TiO2 nanodendrite (ND)/nanoparticle (NP) composite films have been synthesized on fluorine-doped tin oxide (FTO) substrates for use in dye-sensitized solar cells (DSSCs). The rutile TiO2 ND array is first derived from the nanowire (NW) array on FTO by the growth of the branches on the surface of the TiO2 NWs using a wet chemical route in the absence of an organic structure-directing agent. High-resolution transmission electron microscopy (HRTEM) characterization shows that twin structures appear at the boundary of the NWs and branches. The NPs are subsequently grown within the interstices of the ND array by another chemical bath deposition. With an anode thickness of 3 μm, the efficiency of the rutile TiO2 ND/NP DSSC is superior to that of the P25 DSSC. Although a slower electron transport rate is observed in the rutile TiO2 ND/NP anode compared to the P25 anode, the rutile TiO2 ND/NP anode possesses a significantly larger electron lifetime and therefore a superior diffusion length.