TY - JOUR
T1 - Exciton related photoluminescence stimulation in SiC nanocrystals
AU - Torchynska, T.
AU - Polupan, G.
PY - 2009/4
Y1 - 2009/4
N2 - The paper presents the results of porous SiC characterization using scanning electron microscopy (SEM), X-ray diffraction (XRD) and photoluminescence spectroscopy techniques. XRD study shows the investigated porous 6H-SiC layers contain inclusions of 4H-SiC and 15R-SiC polytypes as well as the amorphous graphite phase. Photoluminescence study of PSiC layers with different thicknesses and SiC NC sizes reveals the intensity stimulation for exciton and defect-related PL bands. The intensity stimulation of defect-related PL bands is due to the increase, at the etching process, of the concentration of surface defects, apparently to deal with carbon. The intensity enhancement for exciton-related PL bands is attributed to the exciton recombination rate increasing due to the realization of exciton confinement and exciton-polariton effects in big size SiC NCs of different polytypes (6H-PSiC with inclusions of 15R- and 4H-PSiC).
AB - The paper presents the results of porous SiC characterization using scanning electron microscopy (SEM), X-ray diffraction (XRD) and photoluminescence spectroscopy techniques. XRD study shows the investigated porous 6H-SiC layers contain inclusions of 4H-SiC and 15R-SiC polytypes as well as the amorphous graphite phase. Photoluminescence study of PSiC layers with different thicknesses and SiC NC sizes reveals the intensity stimulation for exciton and defect-related PL bands. The intensity stimulation of defect-related PL bands is due to the increase, at the etching process, of the concentration of surface defects, apparently to deal with carbon. The intensity enhancement for exciton-related PL bands is attributed to the exciton recombination rate increasing due to the realization of exciton confinement and exciton-polariton effects in big size SiC NCs of different polytypes (6H-PSiC with inclusions of 15R- and 4H-PSiC).
KW - Emission
KW - Exciton-polariton effect
KW - Excitonic confinement
KW - SiC nanocrystals
UR - http://www.scopus.com/inward/record.url?scp=62949091237&partnerID=8YFLogxK
U2 - 10.1016/j.spmi.2008.09.012
DO - 10.1016/j.spmi.2008.09.012
M3 - Artículo
SN - 0749-6036
VL - 45
SP - 222
EP - 227
JO - Superlattices and Microstructures
JF - Superlattices and Microstructures
IS - 4-5
ER -