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Electro-optical effects of high aspect ratio P3HT nanofibers colloid in polymer micro-fluid cells
KTH, School of Engineering Sciences (SCI).
KTH, School of Engineering Sciences (SCI).ORCID iD: 0000-0002-0728-6684
KTH, School of Electrical Engineering (EES), Micro and Nanosystems.ORCID iD: 0000-0003-4322-6192
KTH, School of Engineering Sciences (SCI).
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2017 (English)In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 42, no 11, p. 2157-2160Article in journal (Refereed) Published
Abstract [en]

This Letter reports the electro-optical (EO) effect of Poly(3-hexylthiophene-2,5-diyl) (P3HT) nanofibers colloid in a polymer micro-fluidic EO cell. P3HT nanofibers are high aspect ratio semiconducting nanostructures, and can be collectively aligned by an external alternating electric field. Optical transmission modulated by the electric field is a manifestation of the electro-optical effect due to high inner crystallinity of P3HT nanofibers. According to our results, the degree of alignment reaches a maximum at 0.6 V/μm of electric field strength, implying a big polarizability value due to geometry and electrical properties of P3HT nanofibers. We believe that one-dimensional crystalline organic nanostructures have a large potential in EO devices due to their significant anisotropy, wide variety of properties, low actuation voltages, and opportunity to be tailored via adjustment of the fabrication process.

Place, publisher, year, edition, pages
OSA Publishing , 2017. Vol. 42, no 11, p. 2157-2160
Keywords [en]
P3HT, Nanofibers, optofluidics, reaction injectin molding, RIM, OSTE, micro-fluid cells
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:kth:diva-207850DOI: 10.1364/OL.42.002157ISI: 000403534700027OAI: oai:DiVA.org:kth-207850DiVA, id: diva2:1098890
Note

QC 20170613

Available from: 2017-05-27 Created: 2017-05-27 Last updated: 2017-12-29Bibliographically approved
In thesis
1. Electro-optical properties of one-dimensional organic crystals
Open this publication in new window or tab >>Electro-optical properties of one-dimensional organic crystals
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The recent development of photonics and applications puts new challenges for systems using emission, transmission and modulation of light. For these reasons, novel optical materials attract a special interest for their enabling properties for novel technologies.

In this work, we performed the research on fundamental properties and the possibility of implementation of electro-optical response of Poly-3-hexylthiophene-2,5-diyl (P3HT) nanofibers, which belong to the class of organic semiconductor crystalline materials. Our research demonstrated that an external electric field allows controlling the orientation of nanofibers dispersed in a solution by changing the electrical properties of P3HT crystals. This method was used to introduce a collective alignment of P3HT nanofibers and to impact the optical properties of the colloid. The spectroscopic and polarization measurements show that P3HT nanofibers possess optical anisotropy in a wide range of visible spectrum. This property combined with the ability to manipulate the orientation of nanofibers dynamically, was used for direct phase and intensity modulation of transmitted light. Along with these investigations, several engineering and technology tasks were solved. We have designed the transverse electro-optical cell using all-optical-fiber approach, as well as the longitudinal electro-optical cell was fabricated using a novel polymer molding technique.

The obtained research results demonstrate the potential of P3HT crystalline nanofibers as a material class of large niche of applications, not only limited to photovoltaics but also being implemented in electro-optical systems to control light polarization and propagation.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. p. 55
National Category
Nano Technology
Research subject
Physics
Identifiers
urn:nbn:se:kth:diva-220529 (URN)
Public defence
2017-11-24, Sal C, Electrum, Stockholm, 10:00 (English)
Supervisors
Note

QC 20171229

Available from: 2017-12-29 Created: 2017-12-22 Last updated: 2018-01-18Bibliographically approved

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Lobov, GlebMarinins, AleksandrsShafagh, R. Zandivan der Wijngaart, W.Haraldsson, T.

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