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Structural stability of naphthyl end-capped oligothiophenes in organic field-effect transistors measured by grazing-incidence X-ray diffraction in operando

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Huss-Hansen, Mathias K., Lauritzen, Andreas E., Bikondoa, Oier, Torkkeli, Mika, Tavares, Luciana, Knaapila, Matti and Kjelstrup-Hansen, Jakob (2017) Structural stability of naphthyl end-capped oligothiophenes in organic field-effect transistors measured by grazing-incidence X-ray diffraction in operando. Organic Electronics, 49 . pp. 375-381. doi:10.1016/j.orgel.2017.07.012 ISSN 1566-1199.

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Official URL: http://dx.doi.org/10.1016/j.orgel.2017.07.012

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Abstract

We report on microstructural durability of 5,5′-bis(naphth-2-yl)-2,2′-bithiophene (NaT2) in organic field effect transistors (OFETs) in operando monitored by grazing-incidence X-ray diffraction (GIXRD). NaT2 maintains its monoclinic bulk motif in operating OFETs with a=20.31±0.06 Å, b=6.00±0.01 Å, c=8.17±0.04 Å and β=(96.64±0.74)∘. Crystallites appear as a mosaic of single crystals reaching through the whole 50 nm thick active layer. The lattice parameters variation (<1%) falls within the statistical error of structure refinement when the OFET gate voltage is varied from 0 V to −40 V; or when the OFET is continuously cycled within this voltage interval over more than 10 h period. Within the first few cycles, both the hole mobility and threshold voltage are changing but then reach stable levels with an average mobility of View the MathML source and an average threshold voltage of −13.6±0.2 V, both varying less than 4% for the remainder of the 10 h period. This demonstrates crystalline stability of NaT2 in operating OFETs.

Item Type: Journal Article
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Organic field-effect transistors, Organic electronics
Journal or Publication Title: Organic Electronics
Publisher: Elsevier BV
ISSN: 1566-1199
Official Date: October 2017
Dates:
DateEvent
October 2017Published
8 July 2017Available
6 July 2017Accepted
Volume: 49
Page Range: pp. 375-381
DOI: 10.1016/j.orgel.2017.07.012
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 11 July 2017
Date of first compliant Open Access: 8 July 2018
Funder: Engineering and Physical Sciences Research Council (EPSRC), Syddansk universitet [University of Southern Denmark], Horizon 2020 (European Commission) (H2020), Danish Council for Independent Research

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