Optical properties of pyrolytic boron nitride in the energy range 0. 05-10 eV

Journal Article · Thu Nov 15 04:00:00 EST 1984 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.30.6051· OSTI ID:6727175

Hoffman, D M; Doll, G L; Eklund, P C

Optical reflectance studies of the c face of pyrolytic boron nitride were carried out at room temperature in the photon energy range 0.045-10 eV. A Kramers-Kronig analysis was performed to determine the in-plane real (epsilon/sub 1/) and imaginary (epsilon/sub 2/) dielectric functions. Infrared-active transverse-optic phonons were observed at 770 and 1383 cm/sup -1/. Strong impurity- and defect-associated absorption was observed throughout the visible and near-ultraviolet region (1-5 eV) which masks, to some extent, the threshold for absorption across the electronic energy band gap. From epsilon/sub 2/(omega) and the absorption coefficient the authors estimate the direct band gap between ..pi.. bands to be 5.2 +/- 0.2 eV. Interband transitions associated with high joint density of states were observed at 6.10 and 6.85 eV. The structure in epsilon/sub 2/(omega) at energies h omega > 5 eV is identified with specific transitions predicted by previous energy-band calculations. 34 references, 6 figures, 2 tables.

• Research Organization: Univ. of Kentucky, Lexington
• DOE Contract Number: FG05-84ER45151
• OSTI ID: 6727175
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 30:10; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ABSORPTION SPECTRA
BAND THEORY
BORON COMPOUNDS
BORON NITRIDES
CORRELATIONS
CRYSTAL STRUCTURE
DATA
DIELECTRIC PROPERTIES
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ELECTRONIC STRUCTURE
EXPERIMENTAL DATA
INFORMATION
INFRARED RADIATION
KRAMERS-KRONIG CORRELATION
NITRIDES
NITROGEN COMPOUNDS
NUMERICAL DATA
OPTICAL PROPERTIES
PHONONS
PHYSICAL PROPERTIES
PNICTIDES
QUASI PARTICLES
RADIATIONS
REFLECTIVITY
SPECTRA
SURFACE PROPERTIES
VISIBLE SPECTRA