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Proceedings Paper

Trapping mechanisms and dynamics in bis-triarylamine-based photorefractive polymer composites
Author(s): Canek Fuentes-Hernandez; Jayan Thomas; Gerald R. Meredith; Nasser N. Peyghambarian; Seth R. Marder; Bernard Kippelen
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Paper Abstract

We report on the trapping mechanisms in bis-triarylamine (PATPD) based polymer composites. Although exceptional stability under continuous operation has been reported in PATPD-based composites, a small degradation of the response time in photorefractive devices under continuous operation has been found when improved styrene-based chromophores, with high figure-of-merit, are used. The accumulation of relatively large densities (~1017 cm-3) of filled traps is observed even though to first approximation the transport manifold has the lowest ionization potential of all the moieties in the composite, so no apparent deep trapping sites are to be present. The results of spectroscopic studies where the formation of chromophore aggregates is explored and correlated with the formation of hole-trapping sites that dominate the temporal evolution of the photogenerated current density and C60 anion accumulation after several minutes of continuous operation will be presented and compared with numerical simulations considering a two-trapping site model in materials containing the chromophore DBDC.

Paper Details

Date Published: 26 October 2004
PDF: 7 pages
Proc. SPIE 5521, Organic Holographic Materials and Applications II, (26 October 2004); doi: 10.1117/12.562924
Show Author Affiliations
Canek Fuentes-Hernandez, Optical Sciences Ctr./Univ. of Arizona (United States)
Jayan Thomas, Optical Sciences Ctr./Univ. of Arizona (United States)
Gerald R. Meredith, Optical Sciences Ctr./Univ. of Arizona (United States)
Nasser N. Peyghambarian, Optical Sciences Ctr./Univ. of Arizona (United States)
Seth R. Marder, Georgia Institute of Technology (United States)
Bernard Kippelen, Georgia Institute of Technology (United States)


Published in SPIE Proceedings Vol. 5521:
Organic Holographic Materials and Applications II
Klaus Meerholz, Editor(s)

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