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Hole mobility in the polycrystalline layers of anthrone and anthraquinone differs in one order of magnitude in spite of nearly the same crystalline structure. The origin of this difference was determined with use of the quantum-mechanical calculations carried out at the density functional theory level using the B3lYP functional in conjunction with the 6-311++G(d,p) basis set. Based on theses calculations,...
The electronic structure of anthrone and anthraquinone molecules in the gas state and in the simulated crystal unit cell were calculated with time dependent-density functional theory (TD-DFT) method. The values of dipole moment of single molecule and of single crystal unit cell were also determined with TD-DFT method. The results of TD-DFT were compared with known crystal structures of both compounds...
Complex analyzes were made using methods of molecular quantum mechanics to investigate the effect of the dipole moment of the molecule carrier drift mobility in polycrystalline layers composed of anthrone and anthrachinone molecules. The differences in the measured mobility values seems to be originated in the variations of the geometry of the frontier orbitals rather than the differences inherent...
The hole drift mobilities were measured with use of time of flight method (TOF) for layers of antrachinone and anthrone with different structural orders. The differences in the values of mobility for anthrone and anthrachinone are explained as an effect of different permanent dipole moment for these molecules.
Drift mobility of holes in antrachinone and anthrone thin films evaporated in the vacuum of the order of 10-5 Tr was determined with time of flight method (TOF). The layers had different structural order due to the temperature of vaporized substrates. The results show almost lack of the mobility dependence due to the structural order. One order of difference in mobility values for antrachinone and...
The activation process and the transport process for electrons in the tetracene layers and holes in the p-quaterphenyl layers is considered. Observed dependence of the conductivity on the vapor concentration of the activator molecules may suggests influence of collisions as a source of injection of the charge through surface potential barrier of adsorption.
Drift mobility of holes in antrachinone and anthrone polycrystalline thin films evaporated in the vacuum of the order of 10-5 Torr was measured with time-of-flight- method. The one order difference in mobility values for both -four ring acenes purified with zone melting before vaporization and identical in crystallization structure but with different molecule symmetry may have the origin in the presence...
Transport processes enhanced by absorption of the volatile ethanol on the tetracene and p-quaterphenyl films are considered. Obtained results may approve chemisorption's mechanism with hydrogen bonding.
There were investigated the magnitude of the mobility and the Type of the mechanism of the electron transport in the anthrone layers with a different grade of the structural order, namely in polycrystalline and quasi-amorphous layers. The anthron samples were obtained by evaporation in vacuum under the pressure of the order of 10-5 Torr on glass plates with different substrate temperatures and with...
Transport processes enhanced by absorption of the volatile ethanol on the tetracene and p-quaterphenyl films are considered. Obtained results may suggest injection of the charge during chemisorptions. There was observed a deep modulation of conductivity due to absorption of ethanol, this dependence suggests some ability to utilize.
There were investigated the magnitude of the mobility and the type of the mechanism of the electron transport in the amorphous antrachinone layers. Antrachinone (C14H8O2) is the molecular crystal. The antrachinone molecules are planar, centrosymmetric and posses permanent dipole moment practically equal zero. The antrachinone layerss were obtained by evaporation in vacuum under the pressure of the...
There were investigated the magnitude of the mobility and the type of the mechanism of the electron transport in the amorphous anthrone layers Enthrone (C14H10O) is the molecular crystal. The anthrone molecules due to theirs asymmetry posses permanent dipole moment, µ = 1.22 10-29 Cm. The anthrone samples were obtained by evaporation in vacuum under the pressure of the order of 10-5 Torr on glass...
The activation process and the transport process for electrons in the tetracene layers and holes in the p-quaterphenyl layers is considered. Obtained results may suggests the hopping transport through the localized states near the Fermi level as a dominant kind of transport. Observed dependence of the conductivity on the vapor concentration of the activator molecules may suggest that tetracene is...
The activation process and the transport process for electrons in the tetracene layers is considered. Obtained results may suggests the hopping transport through the localized states near the Fermi level as a dominant kind of transport. Observed dependence of the conductivity on the vapor concentration of the activator molecules may suggest some ability to utilize.
Charge carrier conductivity mechanism for holes in activated p-quaterphenyl layers was investigated in this work. The results suggest that hopping transport through the localized states near the Fermi level dominate in those layers. The process of activation leads to the growth of the dc conductivity in aromatic hydrocarbons and this is the reversible process. This suggest the possibility to utilize...
For the first time the investigations of hole drift mobility for amorphous tetracene films were carried out. The amorphous tetracene films were obtained with the aid of vacuum evaporation technique. Tetracene was deposited on the glass substrates with the temperature 140 - 150 K in vacuum of the order of 10-5 Torr. The carrier mobility was evaluated with the aid of the time-of-flight method. Obtained...
For the first time the investigations of drift mobility for hole and electron for quasi - amorphous tetracene films were carried out. The quasi -amorphous tetracene films were obtained with the aid of vacuum evaporation technique. Tetracene was deposited on the glass substrates with the temperature 170- 200 K in vacuum of the order of 10-5 Torr. The carrier mobility was evaluated with the aid of the...
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