Showing 1–1 of 1 results for author: Maine, S

Exciton and interband optical transitions in hBN single crystal

Authors: Luc Museur, Gurvan Brasse, Aurélie Pierret, Sylvain Maine, Brigitte Attal-Trétout, François Ducastelle, Annick Loiseau, Julien Barjon, Kenji Watanabe, Takashi Taniguchi, Andreï Kanaev

Abstract: Near band gap photoluminescence (PL) of hBN single crystal has been studied at cryogenic temperatures with synchrotron radiation excitation. The PL signal is dominated by the D-series previously assigned to excitons trapped on structural defects. A much weaker S-series of self-trapped excitons at 5.778 eV and 5.804 eV has been observed using time-window PL technique. The S-series excitation spectr… ▽ More Near band gap photoluminescence (PL) of hBN single crystal has been studied at cryogenic temperatures with synchrotron radiation excitation. The PL signal is dominated by the D-series previously assigned to excitons trapped on structural defects. A much weaker S-series of self-trapped excitons at 5.778 eV and 5.804 eV has been observed using time-window PL technique. The S-series excitation spectrum shows a strong peak at 6.02 eV, assigned to free exciton absorption. Complementary photoconductivity and PL measurements set the band gap transition energy to 6.4 eV and the Frenkel exciton binding energy larger than 380 meV. △ Less

Submitted 24 February, 2011; originally announced February 2011.