Photoconductivity of single-walled carbon nanotubes under CW illumination

Document Type

Conference Proceeding

Date of Original Version



The photoconductive response of single-walled carbon nanotubes (SWNTs) has been studied under CW illumination in the NIR (900-1800 nm) and far-IR (9-10 μm) range. SWNTs were coated onto patterned gold electrodes with spacing which was varied from 5 to 300 nm. SWNT samples exhibit absorption NIR bands that are typical for semiconducting nanotubes with a diameter distribution of 0.8-1.1 nm and band at ∼10 μm in the far-IR range. A clear correlation between current and IR exposure has been observed. The detection of photoconductivity requires instrumentation with a high dynamic range due to a significant dark current. The photocurrent exhibits a linear response with light intensity and with bias voltage. Possible mechanisms of photoconductivity in SWNT films and applications of this new photosensitive material are discussed.

Publication Title, e.g., Journal

Proceedings of the IEEE Conference on Nanotechnology