Effect of post-thermal annealing on the structural and optical properties of ZnO thin films prepared from a polymer precursor |
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Authors: | Jijoy. P. Mathew a George Varghese b Jacob Mathew a a Thin Film Research Laboratory |
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Affiliation: | Jijoy. P. Mathew a) , George Varghese b) , and Jacob Mathew a) a) Thin Film Research Laboratory, Department of Physics, St. Berchmans College, Changanassery, Kerala 686101, India b) Department of Physics, Calicut University, Thenjippalam, Kerala, India |
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Abstract: | ZnO thin films were synthesised by a new method which uses polyvinyl alcohol (PVA) as the polymer precursor. The films are annealed at different temperatures and for different annealing times. The structural parameters, like grain size, lattice constants, optical band gap, and Urbach energy, depend on the annealing temperature and time. All the films possess tensile strain, which relaxes as the annealing temperature and time increase. The photoluminescence (PL) spectra contain only ultraviolet (UV) peaks at low temperature, but as the annealing temperature and time increase, we observe peaks at the blue and green regions with a variation in the intensities of these peaks with annealing temperature and time. |
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Keywords: | stress band gap Urbach energy photoluminescence |
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