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Materials 2010, 3(3), 2027-2036; doi:10.3390/ma3032027

Article

A Mechanism of DC-AC Conversion in the Organic Thyristor

Tomohiro Suko ¹ , Ichiro Terasaki ^1,* , Hatsumi Mori ²  and Takehiko Mori ³

¹ Department of Applied Physics, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo 169-8555, Japan ² The Institute for Solid State Physics, The University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa 277-8581, Japan ³ Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8552, Japan

* Author to whom correspondence should be addressed.

Received: 5 February 2010; in revised form: 18 February 2010 / Accepted: 16 March 2010 / Published: 19 March 2010

(This article belongs to the Special Issue Organic Electronic Materials)

Download PDF Full-Text [641 KB, uploaded 19 March 2010 11:50 CET]

Abstract: The charge ordered organic salt θ-(BEDT-TTF)₂CsZn(SCN)₄ exhibits a giant nonlinear conduction at low temperatures. The voltage-current characteristics of this compound are similar to those of a thyristor device, after which we named it the organic thyristor. This material shows current oscillation in the presense of dc voltage, which arises from a mechanism different from conventional oscillating circuits, because the oscillation appears in a sample that does not show negative derivative resistance. We have performed a standard circuit analysis, and show that the voltage-current curve is “blurred” in the high current region, and the oscillation occurs in the blurred region. This type of oscillation has never been reported, and a possible origin for this is suggested.

Keywords: organic conductor; charge order; nonlinear conduction; current oscillation

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