期刊
ACS NANO
卷 3, 期 11, 页码 3744-3748出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn900962f
关键词
carbon nanotube; field-effect transistor; excitons; doping; screening; photoluminescence; electroluminescence; optoelectronics; nanophotonics
The photo luminescence of a partially suspended, semiconducting carbon nanotube that forms the active channel of a field-effect transistor is quenched and red-shifted upon application of a longitudinal electrical (source-drain) field. The quenching can be explained by a loss of oscillator strength and an increased Auger-like nonradiative decay of the E(11) exciton. The spectral shifts are due to drain-field-induced doping that leads to enhanced dielectric screening. Electroluminescence due to electron impact excitation of E(11) excitons is red-shifted and broadened with respect to the zero-field photo luminescence. A combination of screening and heating of the carbon nanotube can explain both spectral shift and broadening of the electrically induced light emission.
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