Sonicated sol-gel preparation of nanoparticulate ZnO thin films with various deposition speeds: The highly preferredc-axis(0 0 2) orientation enhances the final properties
Zinc oxide (ZnO) thin films have been deposited onto glass substrates at various deposition speeds by a sonicated sol�gel dip-coating technique. This work studies the effects of deposition speed on the crystallisation behaviour and optical and electrical properties of the resulting films. X-ray di...
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| Format: | Article |
| Language: | English |
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Elsevier Ltd
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| Online Access: | http://umpir.ump.edu.my/id/eprint/8136/1/Sonicated_sol%E2%80%93gel_preparation_of_nanoparticulate_ZnO_thin_films.pdf http://umpir.ump.edu.my/id/eprint/8136/ |
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| Summary: | Zinc oxide (ZnO) thin films have been deposited onto glass substrates at various deposition speeds by a sonicated sol�gel dip-coating technique. This work studies the effects of deposition speed on the crystallisation behaviour and optical and electrical properties of the resulting films. X-ray diffraction (XRD)analysis showed that thin films were preferentially oriented along the (0 02)c-axis direction of the crystal. The transformation sequence of strain and stress effects in ZnO thin films has also been studied. The
films deposited at a low deposition speed exhibited a large compressive stress of 0.78 GPa, which decreased to 0.43 GPa as the deposition speed increased to 40 mm/min. Interestingly, the enhancement in the crystallinity of these films led to a significant reduction in compressive stress. All films exhibited an average transmittance of greater than 90% in the visible region, with absorption edges at380 nm. The photoluminescence (PL) measurements indicated that the intensity of the emission peaks varied significantly with deposition speed. The optical band gap energy (Eg) was evaluated as 3.276�3.289 eV, which
increased with decreasing compressive stress along thec-axis. The energy band gap of the resulting ZnO
films was found to be strongly influenced by the preferredc-axis (0 0 2) orientation. |
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