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在ITO衬底上电沉积了Co掺杂ZnO系列样品,并用X射线粉末衍射仪和扫描电子显微镜测试了样品的结构和表面形貌.结果表明Co掺杂并没有改变ZnO的六方纤锌矿结构,而只在一定程度上改变了表面形貌.样品的场发射特性测试结果显示,随着Co掺杂浓度的增大,开启场强逐渐增大,进而可以判断ZnO体系的带隙依次变窄.Co掺杂引起ZnO能带结构的变化可归因于掺杂元素引入的d电子与基体材料导带和价带中的s、p电子之间的强的sp-d交换相互作用,这将为ZnO的带隙调控提供一种新的思路.
Co-doped ZnO samples were electrodeposited on ITO substrates and the structure and surface morphology of samples were tested by X-ray powder diffraction and scanning electron microscopy.The results show that Co-doping does not change the hexagonal wurtzite structure of ZnO , But only to some extent changed the surface morphology.The field emission characteristics of the sample test results show that with the increase of Co doping concentration, the field strength increases gradually, and then can be judged ZnO band gap narrowing The change of ZnO band structure caused by Co doping can be attributed to the strong sp-d exchange interaction between the d electrons introduced by the doping element and the s and p electrons in the conduction band and valence band of the host material, It provides a new idea for band gap regulation of ZnO.