Highly sensitive TiO2 based photodetector for environmental sensing applications

Mohamed, Sodky Hamed; Rabia, Mohamed; Awad, Madeha; Hassan, Mohamed Asran

doi:10.21608/jsfw.2025.363984.1000

Highly sensitive TiO2 based photodetector for environmental sensing applications

Document Type : Original Article

Authors

¹ 2Physics Department, Faculty of Science, Sohag University, 82524 Sohag, Egypt

² Nanomaterials Science Research Laboratory, Chemistry Department, Faculty of Science, Beni-Suef University, Beni-Suef, 62514, Egypt

³ Physics deparement, Faculty of science, Sohag University, 82524 Sohag, Egypt

⁴ Physics Department, Faculty of Science, Sohag University, 82524 Sohag, Egypt

10.21608/jsfw.2025.363984.1000

Abstract

TiO2 thin films were fabricated using reactive direct current magnetron sputtering for the possible utilization as visible and/or IR-light photodetectors. The structure, chemical composition, morphology, optical and I-V characteristics were examined. X-ray diffraction inferred the existence of body centered tetragonal anatase crystallographic phase oriented around (101) plain. The chemical compositional analysis via EDAX indicated TiO2.1 stoichiometry. Nanoparticle morphology that is uniformly distributed were observed by SEM investigations. High transmittance over the visible and near spectral ranges with optical band gap of 3.29 eV were observed for the TiO2 thin films. The generated light current values at 1 V bias voltage were 0.251, 0.160 and 0.149 µA/cm2 for illumination with light of 440, 540 and 730 nm, respectively. The reported TiO2 based photodetector has good sensitivity comparable with the previously published works which infers that it may be used in environmental sensing applications. .. ... .. . . . . . .

Keywords