Enhancing Conversion Efficiency of Dye-Sensitized Solar Cell Using Zinc Oxide Nanostructures

• Main Authors: Hsiang-Yi Hu, 胡翔壹
• Other Authors: Fang-I Lai
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/96851697445669990551

碩士 === 元智大學 === 光電工程學系 === 105 === This study adopted a chemical solution technique to prepare a back-contact bottom electrode consisting of three-dimensional ZnO nanostructures. The electrode exhibited dye adsorption and light-scattering characteristics for enhancing the photoelectric conversion efficiency and wide-angle incident light applications of dye-sensitized solar cells. This study used the finite-difference time-domain method to simulate the light scattering of flower-like nanostructure and nanorod structure. The results indicated that the light scattering of flower-like nanostructure is more than nanorods. This study slso explored various types of solar cells by adjusting nanorod growth time, and surface topography. The measurement results obtained from field-emission scanning electron microscopy, and ultraviolet–visible spectroscopy analyses indicated that the density, length, haze, and dye adsorption of the solar cells were different. Among the solar cells, the properties of the flower-like nanostructure were optimal. A variable-angle solar simulator was employed to examine the dye-sensitized solar cells, and electrochemical impedance and quantum efficiency analyses were conducted on them; the results revealed that the interface impedance of the flower-like nanostructure was the lowest. Compared with the solar cells containing vertically aligned nanorods, those containing flower-like nanostructure exhibited higher photovoltaic conversion efficiency, in which the conversion efficiency increased from 0.33% to 0.61%. When the components were placed under solar light with different incident angle, the decreases in photovoltaic conversion efficiency for the f flower-like nanostructure in high and low angles were the smallest, thus indicating that these flower-like nanostructure were associated with relatively more favorable wide-angle characteristics.