Study of thermoelectric properties of Indium doped and un-doped ZnO nanowires and nanobelts

• Main Authors: Po-ChienHuang, 黃博建
• Other Authors: Chuan-Pu Liu
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/39060981788301338399

碩士 === 國立成功大學 === 材料科學及工程學系碩博士班 === 100 === This study is to investigate thermoelectric properties of individual ZnO nanostructures of three types, including un-doped ZnO nanowires and In doped ZnO nanobelts grown by chemical vapor deposition (CVD),and un-doped ZnO nanowires grown by hydrothermal method. To measure Seebeck coefficient, as-grown single nanowires were placed on a device constituting of a pair of micro-heaters with a designed circuit for sensing the temperature difference between two ends of the nanowires. Combining Seebeck coefficient with electrical conductivity measured by four probe measurement, thermoelectric power factor can be derived. The morphology and microstructure of the ZnO nanostructures were characterized by scanning electron microscopy and transmission electron microscopy. The influence of microstructure, chemical composition, and carrier concentration of the ZnO nanostructures on thermoelectric properties is discussed. From the results, the ZnO nanowires grown by hydrothermal method exhibits the largest Seebeck coefficient. While electrical conductivity could be optimized by doping In into ZnO nanostrucutres, thermoelectric power factor is also enhanced.