The Study On Properties Of Tin Doped ZnO Nanoarrays Grown By CBD Method

The characteristics of zinc oxide depend on its microscopic size and morphology. The complex structure of zinc oxide has been widely studied compared to the membrane structure. The optical, magnetic, electrical properties of ZnO can be changed by doping different elements. By doping Tin, we obtained zinc stannate(Zn2SnO4). However, there is little report about Tin-doped ZnO nanoarrays(ZNAs:Sn) so far.As a buffer layer, zinc stannate can improve the optical transmittance and short circuit current as the transparent conductive electrode of CdTe solar cells. Traditionally, zinc stannate is fabricated by magnetron sputtering. We developed a solution method to prepare ZNAs:Sn which can be used as substitution of Zn2 Sn O4 in film solar cells. Combine with the theoretical simulation and experiment data, we successfully synthesis ZnO nanoarrays with suitable density and diameter. A proper doping of Sn was found to be a good method to improve the transmittance of nanoarrays.In this thesis, ZnO nanoarrays(ZNAs) and Tin-doped ZnO nanorod arrays(ZNAs:Sn) were synthesized by hydrothermal method on seeded catalyst layer prepared by Spin coating method. The effect of Sn doping in ZnO nanorod arrays(ZNAs) was investigated by X-ray diffraction, scanning electron microscopy, optical transmittance spectra and ellipsometer,and the Bruggeman effective medium approximation(EMA) theory is employed to model porous columnar structures of ZNAs to acquire the optical constants of our samples. Compared with the pure ZNAs, the ZNAs:Sn have a higher transmittance at the wavelength range 300-800 nm. Calculating with the global standard spectrum(AM1.5), the 5% doped ZNAs:Sn has the highest energy of transmission at the wavelength 300-800 nm, which is 1.6 times as the value that the pure ZNAs has.