skip to main content

Title: Ordinary and extraordinary dielectric functions of rutile SnO{sub 2} up to 20 eV

Spectroscopic ellipsometry at room temperature is applied in order to determine the ordinary (ε{sub ⊥}) and extraordinary (ε{sub ∥}) dielectric functions (DFs) of rutile SnO{sub 2} corresponding to electric field (E) polarization perpendicular (E⊥c) and parallel (E∥c) to the optical axis (c), respectively. Strong anisotropic behavior is found for the full spectral range from 0.5 up to 20 eV. The onsets of strong absorption are found at 4.28 eV and 5.42 eV for E⊥c and E∥c, respectively. A dipole-forbidden band gap at (3.59 ± 0.2) eV at room temperature is found by line shape fits to the imaginary parts of the DFs. Further high-energy transitions are resolved. Their accurate energy values are obtained by fitting the second derivatives of the DFs. Comparison to published DFs calculated by ab-initio theory demonstrates that the electron-hole interaction in SnO{sub 2} is strong and has to be included for interpretation.
Authors:
; ; ;  [1] ; ;  [2] ; ; ; ;  [3]
  1. Institut für Experimentelle Physik, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg (Germany)
  2. Leibniz-Institut für Analytische Wissenschaften—ISAS—e.V., Albert-Einstein-Str. 9, 12489 Berlin (Germany)
  3. Department of Electrical and Computer Engineering, University of California, Santa Barbara, California 93106 (United States)
Publication Date:
OSTI Identifier:
22300043
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 23; 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; ABSORPTION; ANISOTROPY; DIELECTRIC MATERIALS; DIPOLES; ELECTRIC FIELDS; ELLIPSOMETRY; EV RANGE; HOLES; INTERACTIONS; POLARIZATION; RUTILE; TEMPERATURE RANGE 0273-0400 K; TIN OXIDES