Carbon nanotube photo- and electroluminescence in longitudinal electric fields.
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 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 photoluminescence. A combination of screening and heating of the carbon nanotube can explain both spectral shift and broadening of the electrically induced light emission.
Freitag
Marcus
M
IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598, USA. mfreitag@us.ibm.com
Steiner
Mathias
M
Naumov
Anton
A
Small
Joshua P
JP
Bol
Ageeth A
AA
Perebeinos
Vasili
V
Avouris
Phaedon
P