Effects of anodic compact layer on the photoelectrochemical performance of dye sensitized solar cell prepared by anodic electrodeposition

• Main Authors: Cheng-Hsiu Tsai, 蔡承修
• Other Authors: Mao-Sung Wu
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/17691001948528093939

碩士 === 國立高雄應用科技大學 === 化學工程與材料工程系 === 98 === In this research, titania compact layer was prepared by the anodic electrodeposition method in order to modify the structure of porous electrode for dye sensitized solar cells. Thin compact layer was prepared by changing parameters, such as controlling the annealed temperature, deposition current density, and time. The material properties of titania thin films with various deposition conditions and their photoelectrochemical performances were also investigated. SEM (scanning electron microscope) images revealed that the structure of the titania thin film was significantly affected by the depositing current density. The rod-like titania was obtained at low depositing current density, while the stacked structure of nanoparticles was observed by increasing the depositing current density. The thickness of deposited films is approximately 20-40 nm observed by the SEM cross-sectional images. XRD (X-ray diffraction) characteristic peaks of anatase appear when the annealing temperature was raised to 400oC. XRD pattern also indicated that the highly intensity peaks of anatase can be found at an annealing temperature of 450oC. The effects of compact layer on the photoelectrochemical properties of devices were investigated. Electrochemical impedance spectra of devices showed that the anodic charge-transfer resistance can be reduced significantly by the compact layer. The conversion efficiency of device can be enhanced from 6.58% to 7.05% by the compact layer in an electrolyte solvent of methoxy propionitrile. Interestingly, the conversion efficiency of device can reach as high as 8.04% when an electrolyte solvent of acetonitrile was used instead of methoxy propionitrile.