The importance of spinning speed in fabrication of spin-coated organic thin film transistors: Film morphology and field effect mobility

Kenji Kotsuki, Hiroshige Tanaka, Seiji Obata, Sven Stauss, Kazuo Terashima, Koichiro Saiki

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

We have investigated the film morphology and the field effect mobility of 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C8-BTBT) thin films which were formed by spin coating on the SiO2 substrate with solution-processed graphene electrodes. The domain size and the density of aggregates in the C8-BTBT film showed the same dependence on the spinning speed. These competitive two factors (domain size and density of aggregates) give an optimum spinning speed, at which the field effect mobility of C8-BTBT transistor showed a maximum (2.6 cm2/V s). This result indicates the importance of spinning speed in the fabrication of solution processed organic thin film transistors by spin coating.

Original languageEnglish
Article number233306
JournalApplied Physics Letters
Volume104
Issue number23
DOIs
Publication statusPublished - Jun 9 2014
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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