Semiconductor Physics, Quantum Electronics & Optoelectronics, 20 (3), P. 344-348 (2017).

Nanograin boundaries and silicon carbide photoluminescence
S.I. Vlaskina1, G.N. Mishinova3, V.I. Vlaskin4, V.E. Rodionov5, G.S. Svechnikov2

1Yeoju Institute of Technology (Yeoju University), 338, Sejong-ro, Yeoju-eup, Yeoju-gun, Gyeonggi-do, 469-705 Korea, e-mail:
2National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute” Av.Pobedi 37, Kyiv, Ukraine,
3Taras Shevchenko Kyiv National University, 64, Volodymyrs’ka str., 01033 Kyiv, Ukraine
4Sensartech, 2540 Lobelia Dr., Oxnard, 93036 California, USA
5State Institution "Institute of Environmental Geochemistry, NAS of Ukraine" av. Academician Palladin, Kyiv 34a

Abstract. The luminescence spectra of SiC crystals and films with grain boundaries (GB) on the atomic level were observed. The GB spectra are associated with luminescence centers localized in areas of specific structural abnormalities in the crystal, without no reference to the one-dimensional layer-disordering. The zero-phonon part of GB spectra is always within the same energy range (2.890…2.945 eV) and does not fit in the dependence of its position in the energy scale on the percent of hexagonality as in the case of stacking faults (SFi) and deep level (DLi) spectra. The zero-phonon part 2.945…2.890 eV with a fine structure is better observed in crystals with the centers of origin growth of crystal, if ND – NA ~ (2…8)•1016 cm–3, ND ~ (2…7)•1017 cm–3. The edge phonons of the Brillouin zone TA-46 meV, LA-77 meV, TO-95 meV and LO-104 meV are involved in development of the GB spectrum. This spectrum may occur simultaneously with the DLi and SFi ones. The GB spectra also occur after high temperature processing the β-phase (in the 3C-SiC) with appearance of the α-phase. The temperature range of observation is 4.2…40 K. There is synchronous thermal quenching of all elements in the fine structure. The thermal activation energy of quenching is ЕаТ ~ 7 meV.

Keywords: silicon carbide, nanocrystalline film, luminescence, grain boundaries.

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