Transistors with Organic Thin-film of Alkyl-substituted Picene Developed

May 23, 2014

The research group in Okayama University Graduate School of Natural Science and Technology has developed an efficient synthesis route of picene with alkyl groups (3,10-ditetradecylpicene, picene-(C14H29)2). They also fabricated field-effect transistors (FETs) with a thin film of the compound by using either a thermal deposition or a deposition from solution. The FETs showed high performance characteristics.

The findings were published online May 23, 2014 in the journal of Scientific Reports in Nature.
http://www.nature.com/srep/2014/140523/srep05048/full/srep05048.html

Field-effect transistors (FETs) fabricated with organic molecules have desirable characteristics such as mechanical flexibility, low cost, large area coverage, and light weight, so they are expected to be part of the next generation of electronic devices. However, field effect mobility of FETs with organic molecules, one of the transistor performance indices, are lower than that of those with inorganic materials.

In this study, the field-effect mobility, μ, in a picene-(C14H29)2 thin film FET reached ~21cm2 V−1 s−1, which is the highest μ value recorded for organic thin-film FETs. PZT (PbZr0.52Ti0.48O3) was used as a dielectric insulator.

This study has shown that using phenacene-type molecules in transistors would be a promising solution to lead next generation devices such as flexible displays and flexible IC tags.

Contact Information:
Mototaka Senda, Ph.D.
US Representative
Intellectual Property Office, Organization for Research Promotion and Collaboration, Okayama University
Fremont, California USA
TEL: 1-510-797-0907
Email: takasenda@okayama-u.ac.jp

Yoshihiro Kubozono, Ph.D.
Graduate School of Natural Science and Technology, Okayama University, Okayama Japan