| Summary: | 碩士 === 國立中央大學 === 材料科學與工程研究所 === 100 === In this study, the Ag/TiO2 composite nanostructures were utilized as the photoanode in dye-sensitized solar cells (DSSC). For the reference cell, the titanium dioxide nanoparticles (TiNPs) was coated onto the FTO substrate by spin coating technique. The Ag/TiO2 composite nanostructures were applied to enhance the conversion efficiency of the DSSC. The material characteristics were analyzed by SEM, XRD, TEM, XPS, vmicro-Raman and UV-Vis measurements. The cells were then assembled an their I-V characteristics and incident photo conversion efficiency (IPCE) were measured by using the sunlight simulator measurement system.
The nanocomposite structures were implemented into DSSC in three ways. The first way is to introduce titanium dioxide nanotubes (TiNTs) into the DSSC. The results show that the efficiency was increased from 2.58% to 2.80% by increasing the photoanode thickness. It allows the dyes to be highly adsorbed, thus enhancing the conversion efficiency. The second way is to deposit silver particles acting as surface plasmons in DSSC. The cell efficiency was found to improve significantly as compared to the reference cell. The third way is by soaking the TiNT in saturated barium nitrate solution, modifying the TiNT surface by forming barium titanate. The efficiency was further enhanced. It was speculated that the dyes was highly adsorbed due to the higher isoelectric point of barium titanate. The integration of the DSSC with the BaTiO3/Ag/TiNT/TiNP and BaTiO3/TiNT/Ag/TiNP structures increased the solar cell efficiency up to 3.31% and 3.07%, respectively.
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