Showing papers on "Organic semiconductor published in 1979"
TL;DR: In this article, the photovoltage signal is observed to decay exponentially following the laser pulse with a relaxation time that is independent both of the wavelength and intensity of the light, which is in agreement with theoretical predictions based on a simple model involving the recombination of the photoinjected charge.
Abstract: The surface photovoltage signals and the associated relaxation times generated by a laser pulse at the surface depletion layers of anthracene (0.8 μV, 5.6 msec), tetracene (12. μV, 10.0 msec), and pentacene (17.5 μV, 20.0 msec) appear to vary with the increasing amount of electron delocalization. As expected, the photovoltage of these materials depends logarithmically on light intensity until a saturation value corresponding to the complete energy band flattening at the surface is achieved, and this energy band bending is larger for pentacene than it is for tetracene. The photovoltage signal is observed to decay exponentially following the laser pulse with a relaxation time that is independent both of the wavelength and intensity of the light. It is established that this is in agreement with theoretical predictions based on a simple model involving the recombination of the photoinjected charge. The photovoltage spectral dependence of all three polyarenes have maxima which correspond to maxima in the corre...
20 citations
01 Jan 1979
TL;DR: In this article, the authors summarize some of the more important chemical and physical properties of polyacetylene and its doped derivatives, including properties ranging from insulator (σ 103 ohm−1 cm−1) to polycrystalline polymer films.
Abstract: Polyacetylene, (CH)x is the simplest organic polymer.Through chemical doping, the electrical conductivity of films of (CH)x can be varied over twelve orders of magnitude with properties ranging from insulator (σ 103 ohm−1 cm−1).Both donors and acceptors can be used with these flexible, free-standing polycrystalline polymer films (thickness 10−5 cm to 0. 5 cm) to yield n-type or p-type material.In this review we summarize some of the more important chemical and physical properties of (CH)x and its doped derivatives.
5 citations
Patent•
19 Apr 1979
TL;DR: In this paper, an n-type electron receiving substance is coated or laminated on a p-type organic semiconductor, and then a metal becoming conductive layer is brought into contact with both front and back surfaces of the laminate.
Abstract: PURPOSE:To provide an organic photovoltaic element having preferable rectifying and photovoltaic characteristics by forming a pn-junction upon formation of a charge transfer complex on the surface of an organic semiconductor and making contact with metal at the junction. CONSTITUTION:An n-type electron receiving substance is coated or laminated on a p-type organic semiconductor, or a p-type electron receiving substance is coated or laminated on an n-type organic semiconductor to form a charge transfer complex on the surface of the organic semiconductor. Then, a metal becoming conductive layer is brought into contact with both front and back surfaces of the laminate. That is, an n-type organic semiconductor layer 4 is laminated on the p-type organic semiconductor layer 3 to form a charge transfer complex 5 in the boundary therebetween, and a conductor layer 1 such as gold, indium oxide or the like is coated on both front and back surfaces of thereof. The layer 3 may, for example, employ poly-n-vinylcarbazole, ploy(gamma-(P-N-carbazolylethyl)-L-glutamate) or the like, and the layer 4 may, for example, employ 2,4,7-trinitrochlorine.
4 citations
21 Oct 1979
TL;DR: In this paper, a list of conductivities of common substances, including polyacetylene derivatives, copolymerization of acetylene with other acetylenes or olefins, and the use of different dopants is presented.
Abstract: : As can be seen from the illustrated Figure, which contains a list of conductivities of common substances, (CH)x is quite remarkable in that its conductivity can be readily modified to span an extraordinarily large range. Considering possible polyacetylene derivatives, replacement of some or all of the hydrogen atoms in (CH)x with organic or inorganic groups, copolymerization of acetylene with other acetylenes or olefins, and the use of different dopants should lead to the development of a large new class of conducting organic polymers with electrical properties that can be controlled over the full range from insulator to semiconductor to metal.
4 citations
Patent•
13 Feb 1979
TL;DR: In this article, a composition capable of transferring charge carriers with ease, having improved mechanical strength, flame retardancy, and heat resistance, comprising inorganic conductive particles, an organic semiconductor, and an insulating high polymer.
Abstract: PURPOSE:A composition capable of transferring charge carriers with ease, having improved mechanical strength, flame retardancy, and heat resistance, comprising inorganic conductive particles, an organic semiconductor, and an insulating high polymer.
2 citations
01 Jan 1979
TL;DR: In this paper, the main concern for those involved in this new subfield of solid state chemistry of molecular solids was the design and synthesis of novel materials with extremely high electrical conductivity.
Abstract: Design and synthesis of novel materials with extremely high electrical conductivity has been the main concern for those involved in this new subfield of solid state chemistry of molecular solids (1). Even though most of the investigators have been concerned with academic sciences, they would never hesitate to exploit possible technological applications. In fact, after Professor Inokuchi conceived the concept of organic semiconductors in 1954 (2), realization of new devices such as organic transistors was expected to result from the extensive research around 1960 (3). Recent explosive activities have also been much stimulated by the interest in a high-temperature superconductor (4).
2 citations
1 citations
TL;DR: In this article, the possibilities of varying the most important characteristics of organic polymers, such as electronic absorption spectra and the spectra of the quantum yield of the internal photo effect, which to a large extent determine the limiting light sensitivity of silver-free and in the first place electrophotographic processes, are examined.
Abstract: The possibilities of varying the most important characteristics of organic polymers — electronic absorption spectra and the spectra of the quantum yield of the internal photoeffect, which to a large extent determine the limiting light sensitivity of silver-free and in the first place electrophotographic processes, are examined. The ways of increasing the quantum yield (electrophotographic sensitivity) by sensitising the internal photoeffect (spectral, structural, and injection) are analysed for linear polymers with saturated and conjugate bonds and polymeric charge-transfer complexes. The nature of the phenomena underlying the photogeneration of free charge carriers in the class of substances under consideration is discussed. It is shown that the maximum electric fields under electrophotographic conditions ensure the attainment of the maximum quantum yield and correspondingly the maximum light sensitivity compared with other applications of organic semiconductors in photographic processes. The bibliography includes 97 references.
IBM1
TL;DR: In organic metals of the TTF-TCNQ family, the partial filling of the conduction bands is achieved by a charge-transfer reaction between the donor and acceptor components Typically the conducting phase resulting from this reaction has a fixed stoichiometry as mentioned in this paper.
Abstract: In organic metals of the TTF-TCNQ family, the partial filling of the conduction bands is achieved by a charge-transfer reaction between the donor and acceptor components Typically the conducting phase resulting from this reaction has a fixed stoichiometry Doping experiments which were performed on these organic metals have been very useful in understanding the detailed features of the phase transitions as well as in clarifying the individual roles of the two kinds of stacks, donor and acceptor The extreme sensitivity of the various physical propert ies to doping can be explained by the quasi one-dimensional nature of the compounds of interest
TL;DR: In this article, the band structures for nickel and copper phthalocyanides are compared and the difference attributed to the change in lattice parameter is attributed to a change in the lattice parameters.
Abstract: The band structures for nickel and copper phthalocyanides are compared and the difference attributed to the change in lattice parameter.