The Preparation of Composite TiO(2) Electrodes for Dye-sensitized Solar Cells
Resource
JOURNAL OF THE CHINESE CHEMICAL SOCIETY, 57, 1131-1135
Journal
Journal of the Chinese Chemical Society
Pages
1131-1135
Date Issued
2010
Date
2010
Author(s)
Su, Chao-Chin
Hung, Wei-Cheng
Lin, Chin-Jung
Chien, Shu-Hua
Abstract
In this work, the 1D titania nanorods (Tnr) were successfully prepared from commercial Degussa P25 powders (DP25) by alkaline hydrothermal method and applied to fabricate the composite TiO2 photoanodes for DSSCs. The morphology of the obtained 1D titania nanomaterials is controllable and is dependent on the post heat treatment. Anatase Tnr (a-Tnr) with diameters of 50-200 nm and lengths of several hundreds nanomaters was obtained after calcination at 600 °C. The BET surface area was 20 m2/g. For DSSCs study, the composite TiO2 pastes with a range of DP25/Tnr weight ratio were used for photoanodes. It was found that by adding the Tnr, the photoconversion efficiency (η) increases, yet, due to the lower surface area of a-Tnr, the DSSC efficiency is deteriorated for higher Tnr content. The DSSC performance also largely depends on the thickness of composite TiO 2 films. The best efficiency of∼7.56% (Voc = 0.81 V, Jsc = 14.9 mA/cm2, FF = 0.63) was achieved forthe D80a20 sample (80% DP25, 20% Tnr) with film thickness of 20 μm. To realize the electron transport properties of composite film, the DSSCs were investigated by electrochemical impedance spectroscopy. The results indicated that the electron transport efficiency is affected by the morphology and composition of the composite TiO2 electrodes.
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Type
journal article
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