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Band gap bowing of nanocrystalline Zn(1−x)CaxO thin films for blue and ultraviolet optoelectronic applications
Institution:1. Department of Applied Chemistry, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan;2. Global Innovation Research Organization, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan;3. Graduate School of Electrical and Electronic Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan;4. Department of Physics, Chemistry and Biology (IFM), Linköping University, S-581 83 Linköping, Sweden;1. Department of Physics Engineering, Faculty of Engineering, Ankara University, 06380 Ankara, Turkey;2. Department of Physics, Faculty of Science, Gazi University, Teknikokullar, 06500 Ankara, Turkey;3. Center Research Laboratory, Application and Research Center, Ankara Yıldırım Beyazıt University, 06050 Ankara, Turkey;4. Department of Energy Systems Engineering, Faculty of Engineering and Natural Sciences, Ankara Yıldırım Beyazıt University, 06010 Ankara, Turkey;1. CSIR-Central Electronics Engineering Research Institute, Pilani, Rajasthan 333031, India;2. Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
Abstract:Alloying materials having different band gaps is a tool to tailor the optical energy gaps of semiconducting materials. In the present study, the effect of alloying ZnO with CaO was investigated. Thin films of Zn(1−x)CaxO (0 ≤ x ≤ 0.20) were deposited on glass substrates by spray pyrolysis technique. All the films possessed nanocrystalline grains and crystallinity deteriorated with increase in Ca2+ substitution level. Elemental composition analysis confirmed the presence of Ca in the samples. Films showed good optical transmission in the visible and near infrared region and the absorption edge blue-shifted with Ca2+ substitution. Optical energy gap enhanced by 9.89% upon 20% Ca2+ substitution. Photoluminescence analysis also confirmed band gap broadening with mesovalent cation substitution.
Keywords:Spray pyrolysis  Nanocrystalline  Blue-shift
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