[17a-B401-1~9] 15.4 III-V-group nitride crystals

[17a-B401-6] Near-band-edge emissions of a monolayer hexagonal BN epitaxial film studied by using cathodoluminescence spectroscopy

〇Kohei Shima¹, Tin Cheng², Christopher Mellor², Peter Beton², Christine Elias³, Bernard Gil³, Guillaume Cassabois³, Sergei Novikov², Shigefusa Chichibu¹ (1.IMRAM-Tohoku Univ., 2.Univ. Nottingham, 3.CNRS Univ. Montpellier)

Keywords:boron nitride, Cathodoluminescence

For the accurate understanding of a luminescence spectrum of monolayer hexagonal BN (mBN), complementary use of a cathodoluminescence (CL) technique is advantageous because an electron beam has no limitations on the excitable bandgap energies and CL spectra is free from resonant Raman scattering signals potentially involved in photoluminescence experiments. Although CL spectra of hexagonal BN flakes composed of 100 down to 6 layers prepared by mechanical exfoliation have been shown, CL spectrum of mBN has not been reported yet. Here we present CL spectra of mBN epilayers prepared by bottom-up process using molecular beam epitaxy.