Photo-electric conversion in dye-doped nanocrystalline titania films
Photo-electric conversion in dye-doped nanocrystalline titania films
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DOI：
10.1016/j.jphotochem.2009.07.011
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发表时间：
2009-09-25
影响因子：
4.3
通讯作者：
Fujii, Tsuneo
中科院分区：
文献类型：
--
作者：
Nishikiori, Hiromasa;Uesugi, Yohei;Fujii, Tsuneo
通过简单的光谱和电学测量，研究了掺杂二氧化钛电极中二氧化钛纳米结构和染料分散对其光电转换性能的影响。在涂有ITO和正常结晶二氧化钛膜的玻璃板上制备染料掺杂纳米晶二氧化钛电极，采用以下两种方法：(1)将含有染料的醇钛溶液制备染料掺杂二氧化钛凝胶膜，然后进行蒸汽处理；(2)将含有染料的醇钛溶胶回流，然后涂覆在玻璃板上。与未处理的非晶二氧化钛凝胶染料掺杂电极相比，经蒸汽处理和回流处理的光电流量子效率显著提高。前者的效率高于后者。通过这些处理，二氧化钛颗粒的生长和结晶以及缺陷密度的降低提高了电导率。蒸汽处理是最突出的方法，因为它提高了二氧化钛的电导率，这取决于它的纳米结构，以及染料与二氧化钛的相互作用，这取决于染料的分散。这些因素似乎在电子通过电极的传输中起重要作用。(C) 2009 Elsevier B.V.版权所有
Influences of the titania nanostructure and dye dispersion in a dye-doped titania electrode on its photoelectric conversion property were investigated by simple spectroscopic and electric measurements. The dye-doped nanocrystalline titania electrodes were prepared on the glass plates coated with ITO and normal crystalline titania films by the following two procedures: (1) the dye-doped titania gel films were prepared from a titanium alkoxide solution containing the dye and then steam-treated, and (2) the titanium alkoxide sol containing the dye was refluxed and then spread onto the plates. The photocurrent quantum efficiency remarkably increased by the steam treatment and the reflux compared to that of the untreated dye-doped electrode consisting of amorphous titania gel. The efficiency in the former was higher than that in the latter. The growth and crystallization of the titania particles and the decrease in the defect density by these treatments improved the electric conductivity. The steam treatment was the more prominent method because it enhanced the electric conductivity of the titania depending on its nanostructure and the dye-titania interaction depending on the dye dispersion. These factors appear to play important roles in transport in the electron through the electrode. (C) 2009 Elsevier B.V. All rights reserved.