Structural and electrical properties of the single-crystal organic semiconductor tetramethyltetraselenafulvalene (TMTSF)

The free-standing single crystal tetramethyltetraselenafulvalene (TMTSF) has been grown with physical vapor deposition (PVD) technique. X-ray diffraction (XRD) analysis shows that both the metallic (TMTSF) ₂PF ₆ and the semiconducting TMTSF have a triclinic crystal structure with a P-1 space group. The TMTSF single crystal forms a brick wall like stacking structure within the ac-plane, which reduces the overall anisotropy of the system. The intrinsic electrical transport properties of the semiconducting TMTSF were probed, utilizing a polymer-based field effect transistor. The TMTSF organic semiconductor exhibited a typical p-type semiconducting characteristics. The field effect mobility was obtained as 3.96 cm ²/Vs, which is an order of magnitude higher than the value reported previously for single crystal TMTSF.