The photorefractive performance of a polymeric composite photosensitized through the inclusion of NiS nanocrystals is described. The nanocrystals were characterized using visible-absorption spectroscopy, energy-dispersive x-ray spectroscopy, and transmission electron microscopy. We further demonstrate the ability to enhance various aspects of the composite's photorefractive performance by performing ligand exchange on the nanocrystals prior to their incorporation into the polymer composite. This procedure resulted in a lowering of the overmodulation voltage from ~70 to ~50 V/µm without affecting the maximum diffraction efficiency of ~40%. An increase in the two-beam-coupling gain coefficient was similarly observed, increasing from 38 to 79 cm−1. The photoconductivities were used in determining the overall quantum efficiencies associated with the photorefractive devices. All experiments were conducted at 633 nm and the data represent a significant improvement in the photorefractive performance of inorganic-organic hybrid photorefractive materials.
T. M. Fears et al., "Photorefractivity in a Polymeric Composite Photosensitized with NiS Nanocrystals," Journal of Chemical Physics, vol. 129, no. 15, American Institute of Physics (AIP), Sep 2008.
The definitive version is available at http://dx.doi.org/10.1063/1.2993253
University of Missouri Research Board
Keywords and Phrases
Organic-Inorganic Hybrid Materials; Photorefractive Effect; Visible Spectra; X-Ray Chemical Analysis
Library of Congress Subject Headings
Transmission electron microscopy
International Standard Serial Number (ISSN)
Article - Journal
© 2008 American Institute of Physics (AIP), All rights reserved.