Sang-Min Park, Mark P. Stoykovich, et al.
Advanced Materials
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. © 2012 American Chemical Society.
Sang-Min Park, Mark P. Stoykovich, et al.
Advanced Materials
Peter J. Price
Surface Science
Shu-Jen Han, Dharmendar Reddy, et al.
ACS Nano
C.M. Brown, L. Cristofolini, et al.
Chemistry of Materials