ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Photoluminescence properties of a freestanding nanoporous SiC layer obtained from bulk6H-SiC substrate as well as SiC nanopowder consisting of numerous separated nanoparticles hasbeen investigated. The nanoporous SiC layer is obtained by UV radiation assisted electrochemicaletching of the 6H-SiC wafer and the SiC nanopowder is formed by mechanical grinding of thenanoporous SiC free layer. A comparison of low temperature PL spectra of the SiC nanostructuresand initial SiC bulk substrate has been performed. The evolution of PL spectra of the SiCnanostructures with respect to their surface states and excitation laser power has been studied. Inparticular, the well pronounced high energy tail above the excitonic bandgap in the PL spectra ofthe nanostructured SiC is attributed to quantum confinement effects. The strong PL signal obtainedbelow the bandgap is explained by radiative transitions involving surface states, N-Al donoracceptorrecombination levels and deep levels corresponding to volume defects in the SiCnanocrystallites
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.556-557.407.pdf
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