Spray pyrolytic deposition of transparent aluminum oxide (Al2O3) films |
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Authors: | Baban P DhongeTom Mathews S Tripura SundariC Thinaharan M KamruddinS Dash AK Tyagi |
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Institution: | a Surface and Nanoscience Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, TN, India b Corrosion Science and Technology Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, TN, India |
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Abstract: | Optically transparent Al2O3 films has been synthesized, on quartz substrates at 500, 600 and 700 °C, from 0.02 M aluminum acetyl acetonate (Al(acac)3) in ethanol, by using ultrasonic spray pyrolysis technique. The films synthesized at 500, 600 and 700 °C are amorphous having average particle sizes 27 ± 6, 18 ± 3 and 14 ± 3, respectively. The films are found to be 95% optically transparent in the visible region. The optical transparency of the films in the ultraviolet region is found to increase with increase in deposition temperature. The observed increase in optical band gap and decrease in refractive index is attributed to the decrease in particle size with increase in deposition temperature. The stoichiometry and chemical bonding of the amorphous film studied using XPS and FTIR spectroscopy revealed the presence chemisorbed oxygen. |
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Keywords: | Spray pyrolysis Transparent Al2O3 thin films Refractive index and band gap |
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