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Electronics 2015, 4(3), 565-581; doi:10.3390/electronics4030565

Homogeneous Crystallization of Micro-DispensedTIPS-Pentacene Using a Two-Solvent System toEnable Printed Inverters on Foil Substrates

1
Fraunhofer EMFT, Hansastraße 27d. Munich 80686, Germany
2
Electronic Packaging Laboratory, Technische Universität Dresden, Dresden 01062, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Mostafa Bassiouni
Received: 30 June 2015 / Revised: 7 August 2015 / Accepted: 10 August 2015 / Published: 21 August 2015
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Abstract

We report on a micro-dispensing system for 6,13-Bis(triisopropylsilylethynyl)pentacene (TIPS-pentacene) to enable homogenous crystallization and uniform filmmorphology of the dispensed droplets using a two-solvent mixture along with the use of aninsulating binder. This solution composition results in a controlled evaporation of the dropletin ambient air such that the Marangoni flow counteracts the outward convective flow toenable uniform radial crystal growth from the edge towards the center of the drops.The consequence of this process is the high degree of uniformity in the crystallization of thedrops, which results in a reduction in the performance spread of the organic field effecttransistors (OFET) created using this process. The addition of the insulating binder furtherimproves the reduction in the spread of the results as a trade-off to the reduction in mobilityof the transistors. The transfer curves of the OFETs show a tight grouping due to thecontrolled self-alignment of the TIPS-pentacene crystals; this repeatability was furtherhighlighted by fabricating p-type inverters with driver to load ratios of 8:1, wherein theoutput inverter curves were also grouped tightly while exhibiting a gain of greater than 4 inthe switching region. Therefore, the reliability and repeatability of this process justifies itsuse to enable large area solution-processed printed circuits at the cost of reduced mobility. View Full-Text
Keywords: TIPS-pentacene; micro-dispensing; Marangoni flow; printed electronics TIPS-pentacene; micro-dispensing; Marangoni flow; printed electronics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Bose, I.; Tetzner, K.; Borner, K.; Bock, K. Homogeneous Crystallization of Micro-DispensedTIPS-Pentacene Using a Two-Solvent System toEnable Printed Inverters on Foil Substrates. Electronics 2015, 4, 565-581.

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