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Author Tabassum, Natasha ♦ Nikas, Vasileios ♦ Ford, Brian ♦ Huang, Mengbing ♦ Kaloyeros, Alain E. ♦ Gallis, Spyros
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ♦ BONDING ♦ CARRIERS ♦ DECAY ♦ ENERGY DEPENDENCE ♦ EXCITATION ♦ LIFETIME ♦ MODULATION ♦ NANOWIRES ♦ PEAKS ♦ PHOTOLUMINESCENCE ♦ PHOTONS ♦ RECOMBINATION ♦ SILICON CARBIDES ♦ SPECTRA ♦ STATISTICS ♦ STEADY-STATE CONDITIONS ♦ TEMPERATURE RANGE 0273-0400 K ♦ THIN FILMS ♦ TIME RESOLUTION
Abstract The study reported herein presents results on the room-temperature photoluminescence (PL) dynamics of chemically synthesized SiC{sub x}O{sub y≤1.6} (0.19 < x < 0.6) thin films and corresponding nanowire (NW) arrays. The PL decay transients of the SiC{sub x}O{sub y} films/NWs are characterized by fast luminescence decay lifetimes that span in the range of 350–950 ps, as determined from their deconvoluted PL decay spectra and their stretched-exponential recombination behavior. Complementary steady-state PL emission peak position studies for SiC{sub x}O{sub y} thin films with varying C content showed similar characteristics pertaining to the variation of their emission peak position with respect to the excitation photon energy. A nearly monotonic increase in the PL energy emission peak, before reaching an energy plateau, was observed with increasing excitation energy. This behavior suggests that band-tail states, related to C-Si/Si-O-C bonding, play a prominent role in the recombination of photo-generated carriers in SiC{sub x}O{sub y}. Furthermore, the PL lifetime behavior of the SiC{sub x}O{sub y} thin films and their NWs was analyzed with respect to their luminescence emission energy. An emission-energy-dependent lifetime was observed, as a result of the modulation of their band-tail states statistics with varying C content and with the reduced dimensionality of the NWs.
ISSN 00036951
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-07-25
Publisher Place United States
Journal Applied Physics Letters
Volume Number 109
Issue Number 4


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