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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/929

Title: The optical absorption and photoconductivity spectra of hexagonal boron nitride single crystals
Authors: REMES, Zdenek
NESLADEK, Milos
HAENEN, Ken
Watanabe, K.
Taniguchi, T.
Issue Date: 2005
Publisher: Wiley - VCH Verlag
Citation: PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, 202(11). p. 2229-2233
Abstract: Recently, a strong cathodoluminescence at 215 nm (photon energy 5.765 eV) has been reported on pure HPHT hexagonal boron nitride (hBN) single crystals (K. Watanabe et al., Nature Mater. 3, 404 (2004)). For the first time, we measured the photocurrent and optical absorption spectra of these new hBN crystals in a broad spectral range 1–6.6 eV. Our measurements support the previously published results, especially that the single crystal hBN has a direct band gap about 5.95 eV, and a rather strong exciton binding energy that allows excitons to exist even at room temperature. We found three new opto-electronic transitions at 2.7, 3.6 and 5.4 eV and observed the oscillatory photoconductivity in 2.7–3.6 eV region.
URI: http://hdl.handle.net/1942/929
DOI: 10.1002/pssa.200561902
ISI #: 000231925500034
ISSN: 0031-8965
Category: A1
Type: Journal Contribution
Validation: ecoom, 2006
Appears in Collections: Research publications

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