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PEDOT surface energy pattern controls fluorescent polymer deposition by dewetting
Linköpings universitet, Institutionen för fysik, kemi och biologi, Biomolekylär och Organisk Elektronik. Linköpings universitet, Tekniska högskolan.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Sensorvetenskap och Molekylfysik. Linköpings universitet, Tekniska högskolan.
Linköpings universitet, Institutionen för fysik, kemi och biologi.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Biomolekylär och Organisk Elektronik. Linköpings universitet, Tekniska högskolan.
2004 (Engelska)Ingår i: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 449, nr 1-2, s. 125-132Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

An elastomeric stamp of poly(dimethylsiloxane) (PDMS) can modify the surface energy of some surfaces when brought into conformal contact with these for some time. The substrates under investigation are a conducting polymer poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT-PSS) and a polyelectrolyte poly(sodium 4-styrenesulfonate) (NaPSS). The changes in surface wetting are characterized by contact angle measurement. Changes are due to the PDMS stamp, which leaves low molecular weight residues on the surface, as shown by infrared reflection absorption spectroscopy. This process may also be operating when other inks are transferred in microcontact printing. Patterning of fluorescent polymer film with feature size of 10–100 μm range is done by confining polymer solutions on the modified surface, by means of spin- or dip-coating. The profile of the patterned film and factors that influence the profile are discussed. This technique is a convenient way to build polymer microstructures for application in organic and biomolecular electronics and photonics.

Ort, förlag, år, upplaga, sidor
2004. Vol. 449, nr 1-2, s. 125-132
Nyckelord [en]
Surface energy, Surface modification by PDMS stamp, Contact angle analysis, IRA spectrum, Polymer patterning
Nationell ämneskategori
Naturvetenskap
Identifikatorer
URN: urn:nbn:se:liu:diva-13884DOI: 10.1016/j.tsf.2003.10.153OAI: oai:DiVA.org:liu-13884DiVA, id: diva2:22126
Tillgänglig från: 2006-07-07 Skapad: 2006-07-07 Senast uppdaterad: 2018-10-08
Ingår i avhandling
1. Surface Energy Patterning and Optoelectronic Devices Based on Conjugated Polymers
Öppna denna publikation i ny flik eller fönster >>Surface Energy Patterning and Optoelectronic Devices Based on Conjugated Polymers
2006 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The work presented in this thesis concerns surface energy modification and patterning of the surfaces of conjugated polymers. Goniometry and Wilhelmy Balance techniques were used to evaluate the surface energy or wettability of a polymer’s surface; infrared reflectionabsorption spectroscopy (IRAS) was used to analyse the residuals on the surface as modified by a bare elastomeric stamp poly(dimethylsiloxane) (PDMS). The stamp was found to be capable of modifying a polymer surface. Patterning of a single and/or double layer of conjugated polymers on the surface can be achieved by surface energy controlled dewetting. Modification of a conjugated polymer film can also be carried out when a sample is subjected to electrochemical doping in an aqueous electrolyte. The dynamic surface energy changes during the process were monitored in-situ using the Wilhelmy balance method.

This thesis also concerns studies of conjugated polymer-based optoelectronics, including light-emitting diodes (PLEDs), that generate light by injecting charge into the active polymer layer, and solar cells (PSCs), that create electrical power by absorbing and then converting solar photons into electron/hole pairs. A phosphorescent metal complex was doped into polythiophene to fabricate PLEDs. The energy transfer from the host polymer to the guest phosphorescent metal (iridium and platinum) complex was studied using photoluminescence and electroluminescence measurements performed at room temperature and at liquid nitrogen temperature. PSCs were prepared using low-bandgap polyfluorene copolymers as an electron donor blended with several fullerene derivatives acting as electron acceptors. Energetic match is the main issue affecting efficient charge transfer at the interface between the polymers and the fullerene derivatives, and therefore the performance of the PSCs. Photoluminescence, luminescence quenching and the lowest unoccupied molecular orbital (LUMO) together with the highest occupied molecular orbital (HOMO) of the active materials in the devices were studied. A newly synthesized fullerene, that could match the low-bandgap polymers, was selected and used as electron acceptor in the PSCs. Photovoltaic properties of these PSCs were characterised, demonstrating one of the most efficient polymer:fullerene SCs that generate photocurrent at 1 μm.

Ort, förlag, år, upplaga, sidor
Institutionen för fysik, kemi och biologi, 2006
Serie
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 996
Nyckelord
Surface energy modification, Patterning, Dewetting, Conjugated polymer, plastic solar cell, Low bandgap, Electron acceptors and donors
Nationell ämneskategori
Fysik
Identifikatorer
urn:nbn:se:liu:diva-7065 (URN)91-85497-00-2 (ISBN)
Disputation
2006-03-10, Planck, Fysikhuset, Campus Valla, Linköpings universitet, Linköping, 10:15 (Engelska)
Opponent
Handledare
Anmärkning
On the day of the defence the status of article number III was Manuscript and article VII was Accepted.Tillgänglig från: 2006-07-07 Skapad: 2006-07-07 Senast uppdaterad: 2018-10-08

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Wang, XiangjunÖstblom, MattiasJohansson, TomasInganäs, Olle

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Biomolekylär och Organisk ElektronikTekniska högskolanSensorvetenskap och MolekylfysikInstitutionen för fysik, kemi och biologi
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