Electrochemical Synthesis of Hierarchical ZnO Nanosheet/Nanoparticle Composite Structures for Dye-Sensitized Solar Cells

• Main Authors: Shih-Chieh Hsu, 徐仕杰
• Other Authors: 余琬琴
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/fu6fdw

碩士 === 國立臺北科技大學 === 有機高分子研究所 === 101 === Hierarchical ZnO nanostructures consisting of nanosheets and nanoparticles were synthesized via a two-step electrochemical deposition process. The two-step process involves the growth of primary nanosheets on conductive glass substrates, followed by the deposition of secondary nanoparticles on the surfaces of the primary nanosheets. Before the second-step electrodeposition took place, the primary nanosheets were calcined at 150°C to convert the as deposited precursors to ZnO. The effects of preparation conditions, including the calcination time of the primary nanosheets, the deposition time, and the electrolyte concentration of the second-step deposition, on the dimensions and structures of the resulting nanoarchitectures were studied using powder x-ray spectroscopy and scanning electron microscopy. This study also investigates the effects of nanostructure preparation conditions on the photovoltaic performances of the resulting dye-sensitized solar cells. The DSSCs based on the synthesized hierarchical nanostructures exhibited improved photovoltaic performances compared to those fabricated using bare nanosheets. By using the optimized preparation condition of nanostructure, an overall conversion efficiency of 4.12% was achieved.