Electroconductive thin film of organic charge transfer complexes

Details Electroconductive thin film of organic charge transfer complexes Electroconductive thin film of organic charge transfer complexes

1990-06-26

1993-07-20

James, Andrew J.

Active solid-state devices (e.g., transistors, solid-state diode

Organic semiconductor material

502158, 505802, 257 9, 257 31, H01L 2928, H01L 3922, H01L 2712

Patent

active

052298450

ABSTRACT:
An organic thin film and process for making the same, having electroconductivity, semiconductivity or superconductivity. The film is made of vapor-deposited bisethylenedithiatetrathiafulvalene (BEDT-TTF) by heating BEDT-TTF at a pressure of 10.sup.-2 Torr or below and at a temperature not higher than 260.degree. C. The temperature of the substrate on which the vapor is deposited is held at a lower temperature than the vapor. A thin film produced under these temperature and pressure conditions contains substantially no decomposition product. The electroconductivity of the film can be adjusted by selecting the substrate used for vapor-deposition of the film and the electron acceptor used as a dopant of the film. In order to achieve a vapor-deposited film with a high degree of orientation, silicon wafer is preferably used as a substrate for the film.

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Kini et al. "(MDT-TTF).sub.2 AuI.sub.2 : An Ambient Pressure Organic Superconductor (T.sub.c =4.5 K) Based on an Unsymmetrical Electron Donor" Solid State Comm. vol. 69(5) Jun. 14, 1989 pp. 503-507.
Schweitzer et al. "Superconductivity in Polycrystalline Pressed Samples of Organic Metals" Solid State Comm. vol. 69(8) Jun. 14, 1989 pp. 843-845.
Gorkov "The Type of Superconductivity in Bechgaard's salts" JETP Lett. vol. 44 No. 11 Dec. 10, 1986 pp. 693-696.
Physica C. vol. 156, No. 1, Aug. 1, 1988, Amsterdam NL pp. 173-175; H. H. Wang et al: "ESR Studies of the 10.4 K Ambient-Pressure Organic Superconductor k-(BEDT-TTF).sub.2 Cu(NCS).sub.2 " * abstract*, *introduction*.
Journal of Molecular Electronics. Jan./Mar. 1989 vol. 5, No. 1, Chichester GB pp. 25-32; E. B. Yagubskii et al: "Organic Conductors and Superconductors Based on Bis(ethylenedthio)tetrathiafulvalene and its Derivatives".

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