Effect of Er doping on optical band gap energy of TiO2 thin films prepared by spin coating |
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| Authors: | Deuk Yong Lee Jin-Tae Kim Ju-Hyun Park Young-Hun Kim In-Kyu Lee Myung-Hyun Lee Bae-Yeon Kim |
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| Affiliation: | 1. Department of Materials Engineering, Daelim University, Anyang 431-715, Republic of Korea;2. Department of Materials Engineering, Korea Aerospace University, Koyang 412-791, Republic of Korea;3. Green Ceramics Division, Korea Institute of Ceramic and Engineering, Seoul 153-801, Republic of Korea;4. Department of Materials Science and Engineering, University of Incheon, Incheon 406-772, Republic of Korea |
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| Abstract: | In order to evaluate the effect of Er doping in the range of 0–1.0 mol% on optical indirect band gap energy (Eg) of the film, the Er-doped TiO2 (Er-TiO2) thin films were spin-coated onto fluorine-doped SnO2 coated (FTO) glasses. Glancing angle X-ray diffraction (GAXRD) results indicated that the films whose thickness was 550 nm consisted of pure anatase and FTO substrate. The anatase (101) TiO2 peaks became broader and weaker with the rise in Er content. The apparent crystallite size decreased from 12 nm to 10 nm with increasing the amount of Er from 0 mol% to 1.0 mol%. UV–vis spectrophotometry showed that the values of Eg decreased from 3.25 eV to 2.81 eV with the increase of Er doping from 0 to 0.7 mol%, but changed to 2.89 eV when Er content was 1.0 mol%. The reduction in Eg might be attributed to electron and/or hole trapping at the donor and acceptor levels in the TiO2 band structure. |
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| Keywords: | Thin films Spin coating FTO glass Transmittance Optical band gap energy |
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