CUED Publications database

Spatially resolved electrostatic potential and photocurrent generation in carbon nanotube array devices.

Engel, M and Steiner, M and Sundaram, RS and Krupke, R and Green, AA and Hersam, MC and Avouris, P (2012) Spatially resolved electrostatic potential and photocurrent generation in carbon nanotube array devices. ACS Nano, 6. pp. 7303-7310.

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Abstract

We have used laser-excited photocurrent microscopy to map the internal electrostatic potential profile of semiconducting single-walled carbon nanotube (S-SWCNT) array devices with a spatial resolution of 250 nm. The measurements of S-SWCNTs on optically transparent samples provide new insights into the physical principles of device operation and reveal performance-limiting local heterogeneities in the electrostatic potential profile not observable with other imaging techniques. The experiments deliver photocurrent images from the underside of the S-SWCNT-metal contacts and thus enable the direct measurement of the charge carrier transfer lengths at the palladium-S-SWCNT and aluminum-S-SWCNT interfaces. We use the experimental results to formulate design rules for optimized layouts of S-SWCNT-based photovoltaic devices. Furthermore, we demonstrate the external control of the electrostatic potential profile in S-SWCNT array devices equipped with local metal gates.

Item Type: Article
Uncontrolled Keywords: Electromagnetic Fields Equipment Design Equipment Failure Analysis Light Materials Testing Nanotubes, Carbon Semiconductors
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:29
Last Modified: 30 Jun 2014 01:08
DOI: 10.1021/nn302416e