Abstract
ZnO nanorods were grown on SiO2/Si substrates and ZnO thin film by a sol-gel method at low temperatures of around T = 95°C. The diameters and the lengths of ZnO nanorods increased at high concentrations of zinc nitrate hexahydrate and methenamine solution. And the grain size of ZnO film is strongly correlated with the shape and the diameters of synthesized ZnO nanorods. Current-voltage characteristics of the ZnO nanorod followed a typical nonlinear behavior with significant photoresponse below λ=400 nm in air, and the conductance was enhanced in vacuum with the decrease of the absolute magnitudes of the photocurrent. In photoluminescence (PL) and photocurrent (PC) spectra, the PL peak (λpeak=380 nm and 3.26 eV) did not match the PC edge (λedge=400 nm and 3.1 eV), indicating the nondirect band-gap transition in photocurrent. The origin of the photocurrent was discussed from the point of the influence of desorption of adsorbed water molecules on the surface or inside the ZnO nanorods.
| Original language | English |
|---|---|
| Article number | L5.8 |
| Pages (from-to) | 113-118 |
| Number of pages | 6 |
| Journal | Materials Research Society Symposium - Proceedings |
| Volume | 836 |
| State | Published - 2005 |
| Event | 2004 Materials Research Society Fall Meeting - Boston, MA, United States Duration: 29 Nov 2004 → 2 Dec 2004 |