Structural and photoluminescence characteristics of ZnO films by room temperature sputtering and rapid thermal annealing process
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- Hsieh, PT., Chen, YC., Wang, CM. et al. Appl. Phys. A (2006) 84: 345. doi:10.1007/s00339-006-3620-2
ZnO thin films deposited on SiO2/Si substrates at room temperature by sputtering technology were annealed with a rapid thermal annealing process at various temperatures from 200 °C to 900 °C. The physical and optical properties of the ZnO films were investigated by X-ray diffraction, scanning electron microscopy and room-temperature photoluminescence (PL). The surface structures of the thin films showed great variations with increased annealing temperature. The PL spectrum illustrated that a stronger UV emission intensity appeared at an annealing temperature of 500 °C. On the other hand, visible-light emission could be obtained when the ZnO films were annealed above 500 °C and reached a maximum intensity at 900 °C. The possible mechanisms for visible-light emission are discussed.