Light sensor of TiO2 doped Al2O3 thin films by using sintering

Main Article Content

Sanit Suwanwong
Kitsana Seesai
Artit Hutem

Abstract

     A light sensor is an electronic device that changes the electrical resistance of a material when it is subjected to light energy. TiO2 is a high resistance semiconductor and a good photocatalyst. Al2O3 is transparent, allows light to pass through and can conduct electricity. When the surface of a semiconductor is exposed to light, its resistance decreases because the oxygen at the surface is released, resulting in an oxygen vacancy. In this study, TiO2 doped with Al2O3 at 5% by mole was sintered at 900, 950 and 1000°C and coated on conductive glass by spin coating technique. The study of phase characteristics of the samples revealed that at higher temperature of sintering, higher peaks of TiO2 and Al2O3 planes were obtained by XRD techniques.  Additionally, SEM images showed that the larger particle size, the lower resistance. It was also found from the study that when 1000 W/m2 intensity from solar simulator was lit on the surface of the thin film, it resulted in the reduction of resistance. When the light was off, the resistance increased but marked lower than its previous level. It is also found that the resistance tended to fell until it reached saturation point. The thin film at 900°C was exhibited the greatest resistance change range. Thus, Al2O3-doped TiO2 thin film is suitable for the fabrication of light sensors.

Article Details

How to Cite
Suwanwong, S., Seesai, K. ., & Hutem, A. . (2022). Light sensor of TiO2 doped Al2O3 thin films by using sintering. Journal of Science and Technology Buriram Rajabhat University (Online), 6(1), 29–38. retrieved from https://ph02.tci-thaijo.org/index.php/scibru/article/view/244848
Section
Research Articles

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