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Title: Electronic structure and optical responses of nanocrystalline BiGaO{sub 3} films: A combination study of experiment and theory

High-quality nanocrystalline BiGaO{sub 3} (BGO) films have been prepared by a modified sol-gel method. X-ray diffraction analysis shows that the films are polycrystalline and exhibit an orthorhombic structure. The dispersion functions near infrared-ultraviolet region were extracted by fitting spectroscopic ellipsometry with the Tauc-Lorentz model. Moreover, first-principle calculations on dielectric functions and band gap were carried out, which are in good agreement with the experimental results. It was found that BGO belongs to an indirect band gap oxide with the fundamental gap of about 2.17‚ÄČeV, which is suitable for ferroelectric based photovoltaic devices.
Authors:
; ; ;  [1] ;  [2] ; ; ;  [1] ;  [3]
  1. Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of Electronic Engineering, East China Normal University, Shanghai 200241 (China)
  2. (China)
  3. National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Science, Shanghai 200083 (China)
Publication Date:
OSTI Identifier:
22277978
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 8; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; BISMUTH COMPOUNDS; ELECTRONIC STRUCTURE; ELLIPSOMETRY; ENERGY GAP; FERROELECTRIC MATERIALS; GALLIUM OXIDES; NANOSTRUCTURES; ORTHORHOMBIC LATTICES; PHOTOVOLTAIC EFFECT; POLYCRYSTALS; SOL-GEL PROCESS; THIN FILMS; ULTRAVIOLET RADIATION; X-RAY DIFFRACTION