Influence of Zn doping on electrical and optical properties of multilayered tin oxide thin films

[摘要] In this study, the electrical and optical properties of Zn doped tin oxide films prepared using solâ€�?�gel spin coating process have been investigated. The SnO₂ : Zn multi-coating films were deposited at optimum deposition conditions using a hydroalcoholic solution consisting of stannous chloride and zinc chloride. Films with Zn doping levels from 0â€�??10 wt% in solution are developed. The results of electrical measurements indicate that the sheet resistance of the deposited films increases with increasing Zn doping concentration and several superimposed coatings are necessary to reach expected low sheet resistance. Films with three coatings show minimum sheet resistance of 1.479 kð›�?/ in the case of undoped SnO₂ and 77 kð›�?/ for 5 wt% Zn doped SnO₂ when coated on glass substrate. In the case of single layer SnO₂ film, absorption edge is 3.57 eV and when doped with Zn absorption edge shifts towards lower energies (longer wavelengths). The absorption edge lies in the range of 3.489â€�??3.557 eV depending upon the Zn doping concentration. The direct and indirect transitions and their dependence on dopant concentration and number of coatings are presented.

[学科分类] 材料工程

[关键词] Transparent conducting oxides;electrical and optical properties;tin oxide films;zinc doping;spin coating.