Comparative Study of Structural, Optical and Electrical Properties of SnOsub2/subThin Film Growth via CBD, Drop-Cast and Dip-Coating Methods

摘要

Tin oxide (SnO₂) thin films were deposited on glass substrate by Chemical Bath Deposition (CBD), Drop-Cast and Dip-Coating method. The thin films were post-annealed at 500°C for 2 hours. The structural, optical, and electrical properties of the SnO₂ thin films were investigated by using XRD, FTIR, SEM, EDX, UV-Vis spectroscopy, and Electrometer experiment. The XRD patterns of SnO₂ thin films deposited on glass substrate by CBD method, Drop-Cast method and Dip-Coating method showed cubic, tetragonal and amorphous structures respectively. The FTIR spectrum exhibited the strong presence of SnO₂ with the characteristic vibrational mode of Sn-O-Sn. The SEM analysis was observed that the surface morphology of the thin films toughly depends on the deposition methods of the SnO₂ thin films. EDX measurement confirmed that the thin films are the composition of Tin (Sn) and Oxygen (O₂). The optical band gap of SnO₂ thin films deposited by CBD method, Drop-Cast method and Dip-Coating method is found to be 3.12 eV, 3.14 eV and 3.16 eV respectively. Thin films deposited by Dip-Coating method showed the highest band gap. The electrical results confirmed that the SnO₂ thin films are good conductors and pursued Ohm’s Law. These properties of the SnO₂ thin films brand are appropriate for application in solar cell assembly, gas sensor devices and transparent electrodes of panel displays.