Table of Contents
Journal of Nanoscience
Volume 2013, Article ID 586208, 5 pages
http://dx.doi.org/10.1155/2013/586208
Research Article

Distinguishing Field Effects from Charge Effects in the Optoelectronic Properties of Carbon Nanotube Films

Structural Engineering Division, NASA Johnson Space Center, Houston, TX 77058, USA

Received 2 April 2013; Accepted 12 June 2013

Academic Editor: Changxin Chen

Copyright © 2013 W. Joshua Kennedy. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We have used charge-induced absorption to quantify the influence of injected charges on electroabsorption measurements in single-wall carbon nanotube films. The interpretations of experimental measurements of processes in nanotubes are simplified by taking into account the change in electron-electron interactions upon charge injection. Electroabsorption spectra that are properly corrected for charge-induced effects show remarkable agreement with a simple Stark shift of the exciton transitions with no notable second-derivative contributions. Thus, distinguishing electric field effects from carrier density effects allows for a more rigorous calculation of exciton polarizability from electroabsorption measurements, even in heterogeneous films. PACS: 78.67.Ch Nanotubes: optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures.