Title:
Electrical characterization and investigation of the piezoresistive effect of PEDOT:PSS thin films

dc.contributor.advisor Brand, Oliver
dc.contributor.author Schweizer, Thomas Martin en_US
dc.contributor.committeeMember Allen, Mark G.
dc.contributor.committeeMember Kippelen, Bernard
dc.contributor.department Electrical and Computer Engineering en_US
dc.date.accessioned 2005-07-28T18:04:23Z
dc.date.available 2005-07-28T18:04:23Z
dc.date.issued 2005-04-19 en_US
dc.description.abstract The field of organic electronics is recently emerging in modern electrical applications. Organic light emitting diodes have been developed and are implemented in commercially available products. The novel materials are also used in sensor applications, utilizing their intrinsic physical, chemical and electrical characteristics. Poly(3,4-ethylenedioxythiophene): poly(styrene-sulfonic acid) (PEDOT:PSS) is one of the most successful organic conductive materials. Developed as antistatic coating, it is now used in other fields as well such as in electro-optical devices as transparent electrodes. One of the reasons for its widely spread use is that water-based dispersions in high quality are available. In addition, it is considered highly stable, resisting degradation under typical ambient conditions. For this work, the usability of PEDOT:PSS as active layer for electromechanical sensor applications was investigated. The electrical properties of the material were characterized including temperature dependencies and environmental influences. A piezoresistive effect with negative sign was found. It is small in magnitude and of the same order as the change in resistance due to geometrical effects. The piezoresistive effect is temperature dependent and increasing in magnitude with higher temperatures. An average longitudinal piezoresistive coefficient pi_l of -5.6x10-10 Pa-1 at room temperature has been evaluated. The transverse effect under the same conditions is opposite in sign and two thirds in magnitude of the lateral effect. The hole mobility of PEDOT:PSS follows an Arrhenius function and thus the resistivity has a negative temperature coefficient. Some other thermally induced effects have been observed such as de-doping of the material resulting in an irreversibly lowered conductivity. Due to the low thermal conductivity of the substrate material used, Joule heating of the samples played an important role during the characterization and was utilized to investigate the temperature dependencies. The change of resistance caused by an applied stress to the sample is small, with a gage factor smaller than one. en_US
dc.description.degree M.S. en_US
dc.format.extent 2016219 bytes
dc.format.mimetype application/pdf
dc.identifier.uri http://hdl.handle.net/1853/6947
dc.language.iso en_US
dc.publisher Georgia Institute of Technology en_US
dc.subject Organic electronics en_US
dc.subject All-plastic
dc.subject Disorder
dc.subject.lcsh Piezoelectric devices Materials en_US
dc.subject.lcsh Organic electronics en_US
dc.subject.lcsh Light emitting diodes en_US
dc.title Electrical characterization and investigation of the piezoresistive effect of PEDOT:PSS thin films en_US
dc.type Text
dc.type.genre Thesis
dspace.entity.type Publication
local.contributor.advisor Brand, Oliver
local.contributor.corporatename School of Electrical and Computer Engineering
local.contributor.corporatename College of Engineering
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relation.isOrgUnitOfPublication 5b7adef2-447c-4270-b9fc-846bd76f80f2
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
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