Issue 6, 2016

The effect of tuning the microstructure of TIPS-tetraazapentacene on the performance of solution processed thin film transistors

Abstract

We report a comprehensive study of the symmetrical 6,13-bis(triisopropylsilylethynyl)tetraazapentacene (TIPS-TAP) used as an electron transporting material in organic field-effect transistors. We study the optical, electronic, structural and morphological properties of thin films of TIPS-TAP as deposited by spin-coating and zone-casting techniques. Depending on the solution processing conditions and procedures we find a variety of microstructures for TIPS-TAP ranging from highly polycrystalline to well-aligned crystalline films. Field-effect transistors are fabricated in two different architectures to evaluate the charge transport properties of TIPS-TAP in such films, and bias-stress experiments reveal a good electric stability of TIPS-TAP. The extracted electron mobilities vary over several orders of magnitude depending on the resulting morphology of the active layer reaching a maximum of 0.42 cm2 V−1 s−1 for uniaxial aligned crystallites in zone-cast transistors.

Graphical abstract: The effect of tuning the microstructure of TIPS-tetraazapentacene on the performance of solution processed thin film transistors

Supplementary files

Article information

Article type
Paper
Submitted
14 okt 2015
Accepted
03 yan 2016
First published
04 yan 2016

J. Mater. Chem. C, 2016,4, 1194-1200

The effect of tuning the microstructure of TIPS-tetraazapentacene on the performance of solution processed thin film transistors

F. Paulus, J. U. Engelhart, P. E. Hopkinson, C. Schimpf, A. Leineweber, H. Sirringhaus, Y. Vaynzof and U. H. F. Bunz, J. Mater. Chem. C, 2016, 4, 1194 DOI: 10.1039/C5TC03326H

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