Exciton decay dynamics in individual carbon nanotubes at room temperature

Gokus, Tobias; Hartschuh, Achim; Harutyunyan, Hayk; Allegrini, Maria; Hennrich, Frank; Kappes, Manfred; Green, Alexander A.; Hersam, Mark C.; Araujo, Paulo T. und Jorio, Ado (2008): Exciton decay dynamics in individual carbon nanotubes at room temperature. In: Applied Physics Letters, Vol. 92, No. 15, 153116

Abstract

We studied the exciton decay dynamics of individual semiconducting single-walled carbon nanotubes at room temperature using time-resolved photoluminescence spectroscopy. The photoluminescence decay from nanotubes of the same (n,m) type follows a single exponential decay function, however, with lifetimes varying between about 1 and 40 ps from nanotube to nanotube. A correlation between broad photoluminescence spectra and short lifetimes was found and explained by defects promoting both nonradiative decay and vibronic dephasing.

• Item Type: Journal article
• Form of publication: Publisher's Version
• Keywords: carbon nanotubes, elemental semiconductors, excitons, photoluminescence, semiconductor nanotubes, time resolved spectra
• Faculties: Chemistry and Pharmacy
• Subjects: 500 Science > 540 Chemistry
• ISSN: 0003-6951
• Language: English