Displacement current detection of photoconduction in carbon nanotubes
- 3 February 2005
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 86 (6)
- https://doi.org/10.1063/1.1863447
Abstract
Using a capacitive photocurrent measurement technique, we demonstrate the ability of both semiconducting and metallic single wall nanotubes to function as photodetectors over a wide spectral range. We observe clear peaks in the photo induced displacement current of a nanotube-plated capacitor that correspond directly to the semiconducting and metallic transitions in the nanotube absorbance spectrum. The signal increases substantially as the carrier drift velocity is raised with applied bias. A large increase in the photocurrent observed below temperatures of 100K suggests that the nanotube hot carrier relaxation rate decreases substantially at low temperatures.Keywords
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