TY - JOUR
T1 - Radiative channel competition in silicon nanocrystallites
AU - Khomenkova, L.
AU - Korsunska, N.
AU - Sheinkman, M.
AU - Stara, T.
AU - Torchynska, T. V.
AU - Vivas Hernandez, A.
N1 - Funding Information:
This work was supported by CONACYT Mexico (Project U42436-Y and Mexico-Ukraine International Project), as well as by CGPI-IPN, Mexico and National Academy of Sciences of Ukraine.
PY - 2005/11
Y1 - 2005/11
N2 - Photoluminescence and its temperature dependence, Raman scattering and photoluminescence excitation spectra for porous silicon, as well as their transformation during keeping in ambient air, have been investigated. The competition of different radiative channels was observed. It is shown that only one of them, that causes infrared emission band and dominates in as-prepared samples, is connected with excitonic recombination in Si nanocrystals. It is found that aging leads to an appearance of second radiative channel that causes red emission. Peculiarities of photoluminescence excitation and Raman scattering spectra, as well as of thermal quenching processes in porous silicon and the conditions for two radiative channel competitions are discussed.
AB - Photoluminescence and its temperature dependence, Raman scattering and photoluminescence excitation spectra for porous silicon, as well as their transformation during keeping in ambient air, have been investigated. The competition of different radiative channels was observed. It is shown that only one of them, that causes infrared emission band and dominates in as-prepared samples, is connected with excitonic recombination in Si nanocrystals. It is found that aging leads to an appearance of second radiative channel that causes red emission. Peculiarities of photoluminescence excitation and Raman scattering spectra, as well as of thermal quenching processes in porous silicon and the conditions for two radiative channel competitions are discussed.
KW - Photoluminescence
KW - Silicon nanocrystallites
UR - http://www.scopus.com/inward/record.url?scp=24744438846&partnerID=8YFLogxK
U2 - 10.1016/j.jlumin.2005.02.014
DO - 10.1016/j.jlumin.2005.02.014
M3 - Artículo
SN - 0022-2313
VL - 115
SP - 117
EP - 121
JO - Journal of Luminescence
JF - Journal of Luminescence
IS - 3-4
ER -