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The electronic structures of the new organic conducting salts, the b'- and b''-phases of (BEDT-TTF)2- [(IBr2)0.2(BrICl)0.1(ICl2)0.7], were examined by calculating their electronic band structures, Fermi surfaces and HOMO-HOMO interaction energies using the extended Hckel tight binding method. On the basis of these calculations, we probed why the b'-phase is semiconducting while the b ''-phase is metallic.