Optical band gap of BiFeO{sub 3} grown by molecular-beam epitaxy

Journal Article · Mon Apr 07 04:00:00 EDT 2008 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.2901160· OSTI ID:21101983

Ihlefeld, J F ^[1]; Podraza, N J; Liu, Z K; Schlom, D G ^[1]; Rai, R C; Xu, X; Musfeldt, J L ^[2]; Heeg, T; Schubert, J ^[3]; Chen, Y B; Pan, X Q ^[4]; Li, J; Collins, R W ^[5]; Ramesh, R ^[6]

---

1. Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802 (United States)
2. Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996 (United States)
3. Institute for Bio- and Nano-Systems (IBN1-IT), Research Centre Juelich, D-52425 Juelich (Germany)
4. Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48019 (United States)
5. Department of Physics and Astronomy, University of Toledo, Toledo, Ohio 43606 (United States)
6. Department of Materials Science and Engineering, University of California, Berkeley, California 94720 (United States)

BiFeO{sub 3} thin films have been deposited on (001) SrTiO{sub 3} substrates by adsorption-controlled reactive molecular-beam epitaxy. For a given bismuth overpressure and oxygen activity, single-phase BiFeO{sub 3} films can be grown over a range of deposition temperatures in accordance with thermodynamic calculations. Four-circle x-ray diffraction reveals phase-pure, epitaxial films with {omega} rocking curve full width at half maximum values as narrow as 29 arc sec (0.008 deg.). Multiple-angle spectroscopic ellipsometry reveals a direct optical band gap at 2.74 eV for stoichiometric as well as 5% bismuth-deficient single-phase BiFeO{sub 3} films.

• OSTI ID: 21101983
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 14 Vol. 92; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ADSORPTION
BISMUTH
BISMUTH COMPOUNDS
CRYSTAL GROWTH
DEPOSITION
ELLIPSOMETRY
ENERGY GAP
EV RANGE 01-10
MOLECULAR BEAM EPITAXY
NEUTRON DIFFRACTION
OXYGEN
STRONTIUM TITANATES
SUBSTRATES
THERMODYNAMICS
THIN FILMS
X-RAY DIFFRACTION