Showing papers on "Organic semiconductor published in 1974"

Polarized Optical Reflection Spectra of the Highly Anisotropic Organic Semiconductor TEA(TCNQ)2

Abstract: From polarized reflection spectra of TEA(TCNQ)2 single crystals at room temperature, quantitative values of the complex dielectric function e(ω) and the optical conductivity σ(ω) in the range from the far infrared to the ultraviolet have been derived. The polarization of the vibrational bands almost exclusively parallel to the highly conducting direction suggests strong interaction of conduction electrons with intramolecular TCNQ vibrations. An Eirikristallen des hoch anisotropen organischen Halbleiters TEA(TCNQ)2 wurden bei Zimmertemperatur die polarisierten Reflexionsspektren vom fernen Infrarot bis ins Ultraviolett gemessen. Daraus wurden die kornplexe Dielektrizitatskonstante e(ω) sonie die optische Leitfahigkeit σ(ω) bestimnit. Die beobachteten Vibrationsbanden sind fast ausschlieslich parallel zur Richtung hoher Leitfahigkeit polarisiert. Das ist ein Hinweis dafur, das die Leitungselektronen ruit den intramolekularen TCNQ-Schningungen stark gekoppelt sind.

Silver halide element containing an organic semiconductor

Abstract: The amine salts of linear polyaniline compounds, including substituted polyaniline compounds, are useful, semiconductors. These materials are generally soluble in popular organic solvents and have resistivities between 10- 3 and 109 ohm-cm. These compounds are useful in the formation of semiconductor compositions, including self-supporting films, and various semiconductor elements such as antistatic films and fibers.

Energy and Charge Transfer in Organic Semiconductors

Abstract: Opening Address.- Charge Carriers.- Voltage Dependence of Unipolar Excess Bulk Charge Density in Organic Insulators.- Geminate Charge-Pair Recombination in Molecular Crystals.- Various Detrapping Processes in Anthraquinone-Doped Anthracene Crystal.- UV Excitation of Anthracene.- Photoconduction and Emission of Phthalocyanine in the Near Infrared.- Optical and Electron Paramagnetic Properties of Radicals in Naphthalene and Anthracene Crystals.- Contribution of Free Radicals to Electrical Conductivity.- Theory.- Green Function of an Exciton Coupled with Phonons in Molecular Crystals.- Theory of Frenkel Excitons Using a Two-Level-Atom Model.- Crystallization.- Glass-Forming Photoconductive Organic Compounds. I. Phase Change and Single Crystal Growth of 1,3-Diphenyl-5-(p-Chlorophenyl)-Pyrazoline.- Semi conductive Coordination Polymers: Dithiooxamides Copper Compounds.- Growth and Purification of Phthalocyanine Polymorphs.- Transport in Amorphous State and Polymers.- Mobility Measurements in Polymers by Pulsed Electron Beams.- Photoconductivity of Poly-N-Vinylcarbazole.- Sensitized Photocurrent in Dye-Deposited Poly-(N-Vinylcarbazole).- Charge Injection and Transport in Disordered Organic Solids.- Charge Transport in TNF:PVK and TNF: Polyester Films and in Liquid, Amorphous and Crystalline TNF.- Superconductivity.- The Problem of Superconductivity in Organic and Organo-Metallic Compounds.- Comments on the Metallic Conductivity in (TTF)(TCNQ) Complex.- Design and Study of 1-Dimensional Organic Conductors I: The Role of Structural Disorder.- Design and Study of 1-Dimensional Organic Conductors II: TTF-TCNQ and Other Organic Semimetals.- Solid Molecular Complexes.- The Structures and Properties of Solid Molecular Complexes and Radical Salts: A Brief Review of Recent Studies in Japan.- Microwave Dielectric Constants of Solid Molecular Complexes.- Electrical and Optical Properties of the Phenothiazine-Iodine and Related Complexes.- Author Index.

Organic semiconductor solar cell

Abstract: A photovoltaic cell is fabricated from an active medium comprising an organic semiconductor in a gel. When a film of such material is sandwiched between transparent conducting electrodes a solar cell is obtained. The electrical output is greatly in excess of that obtained from prior art organic semiconductor solar cells of the same area.

Charge Transport in Aromatic Hydrocarbon Crystals

Abstract: The calculation of two-center transfer integrals (TIs) has been critically examined and closed form analytical expressions have been obtained for them. It has been found that the TI between similar molecules (0,0,0) and (l,m,n) [molecular center located at la+mb+nc] is not the same as that between (0,0,0) and (l,m,n). This necessitates a reformulation of the band theory of charge transport in organic semiconductors. The revised theory has been applied to a number of aromatic hydrocarbon crystals belonging to the space group P21/a (Z=2). In view of the Munn-Siebrand theory of charge transport in anthracene, an attempt has been made to predict the likely mechanism of charge transport (coherent or hopping) in various directions in these crystals. Effect of the molecular size on semiconduction has also been discussed.

Photoconductance of Organic Polymers

Abstract: Photoelectric phenomena in organic polymers are analysed, attention being paid mainly to experimental and theoretical information on the mechanism of photoconduction. Macroscopic photoelectric properties are shown to have common features in polymers, inorganic semiconductors, and organic semiconductors of low molecular weight. A list of 218 references is included.

Analysis of conversion efficiency of organic‐semiconductor solar cells

Abstract: The conversion efficiency of solar cells made of organic semiconductors with metallic electrodes on opposite surfaces is calculated on the basis of a model of two diodes connected in series, but with opposite polarity. We find that the intrinsic conversion efficiency would be two orders of magnitude higher than the conventional value of 10−5–10−6 if the presently used solar‐cell configuration of organic semiconductors could be altered to have an Ohmic contact on one surface.

On some organic semiconducting polymers

Abstract: Information is given on our recent works in the field of oligomer and polymer organic semiconductors. We were especially interested in the influence of various parameters on the electrical properties, e.g. the influence of chemical structure and crystallinity on the electrical conductivity. Various compounds were synthesized and measured (e.g poly(arylene vinylenes), poly(heteroarylene vinylenes), polyazomethines, polymers containing indophenine units, polymer metal complexes, coordination polymers, and polyazines).