Extrinsic and intrinsic photoresponse in monodisperse carbon nanotube thin film transistors

Erik Sczygelski; Vinod K. Sangwan; Chung Chiang Wu; Heather N. Arnold; Ken Everaerts; Tobin J. Marks; Mark C. Hersam; Lincoln J. Lauhon

doi:10.1063/1.4793519

Extrinsic and intrinsic photoresponse in monodisperse carbon nanotube thin film transistors

Erik Sczygelski, Vinod K. Sangwan, Chung Chiang Wu, Heather N. Arnold, Ken Everaerts, Tobin J. Marks, Mark C. Hersam, Lincoln J. Lauhon^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

Spectroscopic, time-resolved scanning photocurrent microscopy is shown to distinguish the intrinsic photoresponse of monodisperse semiconducting (99%) single-walled carbon nanotubes (SWCNTs) from the extrinsic photoresponse of the substrate. A persistent positive photocurrent induced by near-infrared excitation is attributed to the generation of free carriers by inter-band excitation in SWCNTs. For shorter excitation wavelengths, absorption by the Si substrate generates two types of photocurrent: a transient positive photoresponse, identified as a displacement current, and a persistent negative photocurrent that arises from photogating of the SWCNT thin film.

Original language	English (US)
Article number	083104
Journal	Applied Physics Letters
Volume	102
Issue number	8
DOIs	https://doi.org/10.1063/1.4793519
State	Published - Feb 25 2013

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Extrinsic and intrinsic photoresponse in monodisperse carbon nanotube thin film transistors",

abstract = "Spectroscopic, time-resolved scanning photocurrent microscopy is shown to distinguish the intrinsic photoresponse of monodisperse semiconducting (99%) single-walled carbon nanotubes (SWCNTs) from the extrinsic photoresponse of the substrate. A persistent positive photocurrent induced by near-infrared excitation is attributed to the generation of free carriers by inter-band excitation in SWCNTs. For shorter excitation wavelengths, absorption by the Si substrate generates two types of photocurrent: a transient positive photoresponse, identified as a displacement current, and a persistent negative photocurrent that arises from photogating of the SWCNT thin film.",

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Extrinsic and intrinsic photoresponse in monodisperse carbon nanotube thin film transistors. / Sczygelski, Erik; Sangwan, Vinod K.; Wu, Chung Chiang; Arnold, Heather N.; Everaerts, Ken; Marks, Tobin J.; Hersam, Mark C.; Lauhon, Lincoln J.

In: Applied Physics Letters, Vol. 102, No. 8, 083104, 25.02.2013.

Research output: Contribution to journal › Article › peer-review

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AU - Marks, Tobin J.

AU - Hersam, Mark C.

AU - Lauhon, Lincoln J.

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