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.Full text not available from this repository.
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.
|Uncontrolled Keywords:||Electromagnetic Fields Equipment Design Equipment Failure Analysis Light Materials Testing Nanotubes, Carbon Semiconductors|
|Depositing User:||Cron Job|
|Date Deposited:||20 Feb 2013 15:10|
|Last Modified:||20 May 2013 01:39|
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