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High-mobility organic single-crystalline transistors with anisotropic transport based on high symmetrical H-shaped heteroarene derivatives
To reveal the influence of synergistic effect of non-covalent forces on the FET performance, two highly symmetrical H-shaped heteroarene derivatives anthra[2,1-b:3,4-b ‘:6,5-b ”:7,8-b ”’]tetra(benzothiophene) (ATBT) and anthra[2,1-b:3,4-b ‘:6,5-b ”:7,8-b ”’]tetra(benzofuran) (ATBF) as novel two-dimensional (2D) organic semiconductor materials were synthesized. The thermal, optical and electrochemical properties of ATBT and ATBF were investigated and high stability was confirmed. Single crystal XRD of ATBT confirmed the close pi-pi stacking due to the wider pi-conjugation framework and four S atoms sited on both sides of each molecule could produce eight SMIDLINE HORIZONTAL ELLIPSISS contacts with neighbouring molecules. Mobility of up to 15.6 cm(2)V(-1)s(-1)could be achieved for the single-crystalline field effect transistor, which was fabricated by the ‘two-dimensional organic-ribbon mask’ technique based on the individual ATBT microribbon. The strong anisotropy along different crystal axes is consistent with the molecular arrangement, which was evidenced by XRD, TEM and corresponding selected-area electron diffraction pattern. Moreover, the analogue ATBF shows lower FET performance due to lack of SMIDLINE HORIZONTAL ELLIPSISS contacts in comparison to that of ATBT, which reflects that the synergistic effect of non-covalent forces has an important influence on the molecular aggregation and electrical properties.
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Reference:
Benzofuran – Wikipedia,
,Benzofuran | C8H6O – PubChem