Please use this identifier to cite or link to this item:
http://hdl.handle.net/1942/16958
Title: | On the Relation between Morphology and FET Mobility of Poly( 3-alkylthiophene) s at the Polymer/ SiO2 and Polymer/ Air Interface | Authors: | OOSTERBAAN, Wibren BOLSEE, Jean-Christophe Wang, Linjun VRINDTS, Veerle LUTSEN, Laurence Lemaur, Vincent Beljonne, David McNeill, Christopher R. Thomsen, Lars MANCA, Jean VANDERZANDE, Dirk |
Issue Date: | 2014 | Source: | ADVANCED FUNCTIONAL MATERIALS, 24 (14), p. 1994-2004 | Abstract: | The influence of the interface of the dielectric SiO2 on the performance of bottom-contact, bottom-gate poly(3-alkylthiophene) (P3AT) field-effect transistors (FETs) is investigated. In particular, the operation of transistors where the active polythiophene layer is directly spin-coated from chlorobenzene (CB) onto the bare SiO2 dielectric is compared to those where the active layer is first spin-coated then laminated via a wet transfer process such that the film/air interface of this film contacts the SiO2 surface. While an apparent alkyl side-chain length dependent mobility is observed for films directly spin-coated onto the SiO2 dielectric (with mobilities of ≈10−3 cm2 V−1 s−1 or less) for laminated films mobilities of 0.14 ± 0.03 cm2 V−1 s−1 independent of alkyl chain length are recorded. Surface-sensitive near edge X-ray absorption fine structure (NEXAFS) spectroscopy measurements indicate a strong out-of-plane orientation of the polymer backbone at the original air/film interface while much lower average tilt angles of the polymer backbone are observed at the SiO2/film interface. A comparison with NEXAFS on crystalline P3AT nanofibers, as well as molecular mechanics and electronic structure calculations on ideal P3AT crystals suggest a close to crystalline polymer organization at the P3AT/air interface of films from CB. These results emphasize the negative influence of wrongly oriented polymer on charge carrier mobility and highlight the potential of the polymer/air interface in achieving excellent “out-of-plane” orientation and high FET mobilities. | Keywords: | charge transport; conducting polymers; conjugated polymers; organic field-effect transistors; structure-property relationships | Document URI: | http://hdl.handle.net/1942/16958 | ISSN: | 1616-301X | e-ISSN: | 1616-3028 | DOI: | 10.1002/adfm.201303298 | ISI #: | 000333809300004 | Rights: | © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2015 |
Appears in Collections: | Research publications |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
oosterbaan 1.pdf Restricted Access | Published version | 791.21 kB | Adobe PDF | View/Open Request a copy |
SCOPUSTM
Citations
16
checked on Sep 2, 2020
WEB OF SCIENCETM
Citations
18
checked on Oct 13, 2024
Page view(s)
120
checked on Jun 13, 2022
Download(s)
96
checked on Jun 13, 2022
Google ScholarTM
Check
Altmetric
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.