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|Title: ||The optical absorption and photoconductivity spectra of hexagonal boron nitride single crystals|
|Authors: ||REMES, Zdenek|
|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.|
|ISI #: ||000231925500034|
|Type: ||Journal Contribution|
|Validation: ||ecoom, 2006|
|Appears in Collections: ||Research publications|
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