Nano Science and Technology Institute
Nanotech 2013 Vol. 1
Nanotech 2013 Vol. 1
Nanotechnology 2013: Advanced Materials, CNTs, Particles, Films and Composites (Volume 1)
Chapter 9: Nanostructured Coatings, Surfaces & Films

Optical band gap energy of Er-doped TiO2 thin films

Authors:D.Y. Lee, J.H. Park, Y.H. Kim, I.G. Lee
Affilation:Daelim University, KR
Pages:642 - 645
Keywords:Erbium, tatinia, spin coating, optical band gap energy
Abstract:Er-doped TiO2 thin films(0~1.0 mol% Er) having a thickness of 400 to 1200 nm were spin coated onto FTO glass substrate by varying PVP concentration. The optical properties of thin films was examined by glancing angle X-ray diffraction(GAXRD) and UV-vis spectrophotometer. GAXRD results revealed that the films consisted of anatase phase and FTO. The peak intensity of (101) and (200) anatase phase decreased with increasing the Er content. The lowest band gap energy of 2.81 eV was found for the 0.7mo% Er-TiO2 thin film having a thickness of 550 nm. Er ions may be attributed to shallow trapping sites in the band structure of TiO2.
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