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Please use this identifier to cite or link to this item: http://hdl.handle.net/2262/40264

Title: Alternating and direct current characterization and photoinduced absorption studies of modified conjugated polymer thin films
Author: COLEMAN, JONATHAN NESBIT
BLAU, WERNER
DRURY, ANNA
Sponsor: Higher Education Authority
Author's Homepage: http://people.tcd.ie/wblau
http://people.tcd.ie/colemaj
http://people.tcd.ie/adrury
Keywords: Physics
Control of interchain separation
Issue Date: 2004
Publisher: American Institute of Physics
Citation: Lipson SM, Coleman JN, Drury A, O'Brien DF, Blau WJ, Cadby AJ, Lane PA, Bradley DDC, Alternating and direct current characterization and photoinduced absorption studies of modified conjugated polymer thin films, Journal of Applied Physics, 95, 11, 2004, 6138 - 6144
Series/Report no.: Journal of Applied Physics;
95;
11;
Abstract: Control of interchain separation enables the optical properties of polymer thin films to be altered. We present a thin film preparation technique that increases the free volume fraction in spin coated polymer thin films resulting in reduced interchain interaction. The polaron yield, measured using photoinduced absorption, was significantly reduced as a direct result of the increased interchain separation, leading to a higher value for the measured photoluminescence efficiency. Impedance spectroscopy showed an increase in permittivity, probably due to greater polarizability. Increases approaching one order of magnitude were observed for direct current hole conductivity and mobility values. Space charge limited conduction analysis suggests a narrowing of the highest occupied molecular orbital band tail on treatment resulting in reduced trapping. Single layer light emitting devices prepared using this technique were found to be significantly brighter and to have longer operating lifetimes
Description: PUBLISHED
URI: http://hdl.handle.net/2262/40264
Related links: http://dx.doi.org/10.1063/1.1719261
Appears in Collections:Physics (Scholarly Publications)

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