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Surface and Bulk Structural Characterization of a High-Mobility Electron-Transporting Polymer

Title data

Schuettfort, Torben ; Hüttner, Sven ; Lilliu, Samuele ; Macdonald, J. Emyr ; Thomsen, Lars ; McNeill, Christopher R.:
Surface and Bulk Structural Characterization of a High-Mobility Electron-Transporting Polymer.
In: Macromolecules. Vol. 44 (2011) Issue 6 . - pp. 1530-1539.
ISSN 0024-9297
DOI: https://doi.org/10.1021/ma102451b

Official URL: Volltext

Abstract in another language

This publication investigates the microstructure of the high electron mobility polymer poly(N,N′-bis(2-octyldodecyl)-11 naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl-alt-5,5′-(2,2′-12 biothiopene)) (P(NDI2OD-T2)) using a combination of grazing incidence X-ray diffraction (GIXD), near-edge X-ray absorption fine structure (NEXAFS), and optical spectroscopies. GIXD measurements confirm extended in-plane lamellae ordering and out-of-plane π−π stacking. Angle-resolved surface-sensitive NEXAFS measurements, however, indicate a lack of preferred in-plane or out-of-plane orientation of either the conjugated backbone or side chains at the P(NDI2OD-T2) film surface. This lack of pronounced orientation effects is attributed to a significant proportion of amorphous content in the film, with NEXAFS measurements sensitive to both amorphous and crystalline content while GIXD is sensitive only to coherent ordering. Furthermore, it is found that increased crystallinity in annealed thin films is not beneficial to the performance of top-gate bottom-contact field-effect transistors. In fact, both highly crystalline and amorphous P(NDI2OD-T2) devices exhibit similar device performance with saturation mobilities around 0.04 and 0.02 cm2/(V s), respectively, almost 1 order of magnitude lower than the high-performance devices where the pristine morphology has not been subjected to significant heat treatment. Changes in the optical absorption and Raman spectra of P(NDI2OD-T2) thin films with annealing are also presented and discussed.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Junior Professorship Solar Energy > Junior Professorship Solar Energy - Juniorprof. Dr. Sven Hüttner
Profile Fields > Advanced Fields > Polymer and Colloid Science
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Junior Professorship Solar Energy
Profile Fields
Profile Fields > Advanced Fields
Result of work at the UBT: No
DDC Subjects: 500 Science > 530 Physics
500 Science > 540 Chemistry
Date Deposited: 12 Jan 2018 10:25
Last Modified: 12 Jan 2018 10:25
URI: https://eref.uni-bayreuth.de/id/eprint/41713