Showing papers on "Organic semiconductor published in 1969"

Organic semiconductors comprising an electron donating cation which is a group via element derivative of a polycyclic aromatic hydrocarbon and an electron-accepting anion

Abstract: ORGANIC SEMICONDUCTORS ARE DESCRIBED HAVING A ELECTRON DONATING CATION WHICH IS A GROUP VIA ELEMENT DERIVATIVE OF A POLYCYCLIC AROMATIC HYDROCARBON AND AN INORGANIC OR ORGANIC ELECTRON-ACCEPTING ANION. THESE MATERIALS ARE GENERALLY SOLUBLE IN ORDINARY SOLVENTS AND HAVE RESISTIVITIES BETWEEN 10**-2 AND 10**9 OHM-CM. THEY ARE USEFUL IN CONDUCTING COATINGS, FIBERS, ETC.

Charge‐Carrier Injection and the Pre‐exponential Factor in Semiconducting Organic Substances

Abstract: A charge‐carrier injection model is shown to lead to an approximately linear dependence of the preexponential factor on activation energy for small organic semiconductors, without assuming a linear temperature dependence for the activation energy.

Diffusion Doped Organic p‐n Junctions

Abstract: It is demonstrated that the conductivity type of organic semiconductors can be modfied by a mechanism analogous to impurity doping. That is, by suitable choice and control of additives, a given organic host may be rendered either n or p type. Moreover, it is shown that diffusion doping can be employed to form p‐n junctions in a variety of organic host materials. Two examples are discussed in detail to demonstrate the feasibility of doping. First, p‐type tetrathiotetracene (TTT) is shown to become n type on addition of orthochloronil (OC). The apparent cause is the formation of TTT/OC charge transfer complex molecules within the bulk of the TTT host. Secondly, the normally n‐type TTT/OC charge transfer complex is shown to become either increasingly n type or p type on introduction of metal additives. n‐type conduction is achieved with group I and IV metal additives and p‐type conduction with group II and III metal additives. It is also shown that the additives have a significant effect on the conductivity ...

Process for decreasing surface resistivity of organic semiconductors by ultraviolet radiation

Abstract: The surface resistivity of certain organic semiconductors and semiconductor-containing elements is controlled by exposure to ultraviolet radiation.

Process for controlling electrical resistivity of organic semiconductors

Abstract: THE ELECTRICAL RESISTIVITY OF CERTAIN ORGANIC SEMICONDUCTORS AND SEMICONDUCTOR-CONTAINING ELEMENTS IS CONTROLLED BY HEATING.

Structural Effects on Photoconduction in Amorphous Films of Organic Solids

Abstract: Conduction in amorphous organic matrices, typically 10−18 mhos. and in photoexcited amorphous organic semiconductors, has received little attention. We have used systems consisting of inert matrices which are solid at 77 K in which we have dissolved one of several photoactive molecular species. These systems exhibit photocurrents of the order of 10−12 A or more. We have observed unique photocurrent transients on switching the irradiation light off or on. We report a detailed study of the effect of varying the composition of mixtures of ethanol and 3-methylpentane, which form the matrix, on the behaviour of 10−3 M solutions of phenanthrene. A conduction mechanism is outlined.