Study on Nanoporous TiO2 Photoanode for Dye Sensitized Solar Cell

• Main Authors: Bo-Wei Zhan, 詹博為
• Other Authors: Hsueh-Tao Chou
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/04266158021343000703

碩士 === 國立雲林科技大學 === 電子與光電工程研究所碩士班 === 100 === Photovoltic power is a hot topic among the recent clean energy sorces. Although silicon solar cell is the most popular, it has to overcome many problems for a practical use, such as the stability, scaling up and cost. On the other hand, a dye-sensitized solar cell is one of the most promising candidates for a high-performance solar cell in the next generation, since it is fabricated by a simple manufacture process at relatively low cost. Electron transport and recombination in dye sensitized solar is an open question and a key of further improvement of the cell’s performance and stability. For example, the current density and efficiency of solar cells could be increasing by increase the thickness of photoelectrode, or increasing by increase the porosity. But while this is happening, many complicated electron transport and recombination are taking place. In this study, we have fabricated nanoporous TiO2 photoanode for dye-sensitized solar cells. First, The Polyethylene Glycol (PEG) was added into the TiO2 of photoanode. The porosity of the photoanode was easy to control after annealing. The converting efficiency of this Solar cell was improved from 2% to 3.04%.Next, we applied a TiO2 compact layer at the interface between the FTO and the nanoporous layer, which reduced the charge recombination loss. The converting efficiency of this solar cell was improved from 3.04% to 3.43%. Finally, we fabricated photoanode by spray coating system, of our own design. We increased the thickness of photoanode in order to enhance dye adsorption and photocurrent density. The solar cell converting efficiency was improved to 3.85% when the thickness is 7.75μm (without compact layer), and to 4.27% when the thickness is 15.4μm (with compact layer).