One-dimensional ZnO And ZnO:In Nanostructures And ZnO-based Photovoltaic Devices

One-dimensional ZnO nanostructures are one of the present research hotspots in ZnO materials, due to their excellent optical and electrical properties. In this thesis, we investigate the structural, optical and electronic properties of self-assembled zinc oxide (ZnO) and indium doping zinc oxide (ZnO:In) nanorods and array nanostructures synthesized without catalyst in aqueous solution. We also explore the properties of ZnO:In heterojunction photovoltaic devices. The details are as follows:(1) One-dimensional ZnO and ZnO:In nanostructures were synthesized without catalyst in aqueous solution. XRD and Raman spectra demenstrated the formation of typical hexagonal wurtzite structures, and an increase of lattice constant after In doping. The PL spectra of ZnO showed a strong UV emission band, and a very weak visible emission associated with deep level defects. Indium incorporation induced the broadening of optical bandgap, blueshift of UV emission, and the quenching of the near-band-edge photoluminescence. This may be useful for photocurrent producing. Abnormal temperature dependence of UV emission integrated intensity of ZnO and ZnO:In samples is observed. The mechanism of the negative thermal quenching was investigated.(2) The ZnO:In nanorods/SiO₂/n-Si heterostructure photovoltaic device was prepared. The structural and photoelectric properties of the as-grown ZnO:In nanorods were analyzed. ZnO:In nanorods had a strong and broad UV surface photovoltage response, the charge transfer properties were investigated. The photoelectric conversion properties of ZnO:In nanorods/SiO₂/n-Si heterostructure were investigated. ZnO:In/SiO₂/n-Si heterostructure showed a wide range photocurrent spectral response...