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Tetrathiotetracene thin film morphology and electrical properties

Pudzs, K.; Vembris, A.; Busenbergs, J.; Rutkis, M.; Woodward, Simon

Authors

K. Pudzs

A. Vembris

J. Busenbergs

M. Rutkis

SIMON WOODWARD simon.woodward@nottingham.ac.uk
Professor of Synthetic Organic Chemistry



Abstract

The electrical properties of organic thin films are determined by their chemical constituents and the morphology of the films deposited. In this paper the morphology of vacuum sublimed (7∙10-6 mbar) tetrathiotetracene (TTT) thin films is shown to be strongly affected by the thermal deposition temperature (222-350 K) and rate of deposition. Mostly needle-like morphologies are identified by scanning electron microscopy. Optimal TTT purity (a pre-requisite for device preparation via subsequent oxidation) is evidenced by their initially low electrical conductivity. Altering the TTT morphology, by variation of the evaporation parameters, strongly affects this base electrical conductivity. Four probe conductivity measurements and charge extraction by linear increasing voltage methods are used to characterize film electrical properties. In-plane conductivity of up to 7.03∙10-5 S/cm is achieved for pure TTT thin films. Subsequent aerial oxidation resulted in a 3.4-fold increase in electrical conductivity.

Citation

Pudzs, K., Vembris, A., Busenbergs, J., Rutkis, M., & Woodward, S. (in press). Tetrathiotetracene thin film morphology and electrical properties. Thin Solid Films, 598, https://doi.org/10.1016/j.tsf.2015.11.087

Journal Article Type Article
Acceptance Date Nov 24, 2015
Online Publication Date Dec 11, 2015
Deposit Date Dec 16, 2015
Publicly Available Date Dec 16, 2015
Journal Thin Solid Thins
Electronic ISSN 0040-6090
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 598
DOI https://doi.org/10.1016/j.tsf.2015.11.087
Keywords tetrathiotetracene; thin film; electrical conductivity; morphology
Public URL http://eprints.nottingham.ac.uk/id/eprint/31087
Publisher URL http://www.sciencedirect.com/science/article/pii/S0040609015012730
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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