Carbon Nanotube Photo- and Electroluminescence in Longitudinal Electric Fields

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• 作者：Marcus Freitag ; Mathias Steiner ; Anton Naumov ; Joshua P. Small ; Ageeth A. Bol ; Vasili Perebeinos ; Phaedon Avouris
• 刊名：ACS Nano
• 出版年：2009
• 出版时间：November 24, 2009
• 年：2009
• 卷：3
• 期：11
• 页码：3744-3748
• 全文大小：252K
• 年卷期：0
• ISSN：1936-086X

文摘

The photoluminescence 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 E₁₁ exciton. The spectral shifts are due to drain-field-induced doping that leads to enhanced dielectric screening. Electroluminescence due to electron impact excitation of E₁₁ excitons is red-shifted and broadened with respect to the zero-field photoluminescence. A combination of screening and heating of the carbon nanotube can explain both spectral shift and broadening of the electrically induced light emission.