F.J. Himpsel, T.A. Jung, et al.
Surface Review and Letters
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.
F.J. Himpsel, T.A. Jung, et al.
Surface Review and Letters
H.D. Dulman, R.H. Pantell, et al.
Physical Review B
Q.R. Huang, Ho-Cheol Kim, et al.
Macromolecules
G. Will, N. Masciocchi, et al.
Zeitschrift fur Kristallographie - New Crystal Structures