The Ohio State University

Zettacore, Inc.

Richard L McCreery

Matthew R Callstrom

Kenneth J Mobley

Paula J Rossi

Jing Wu

Clyde W McCurdy

The electronic properties of molecular junctions of the general type carbon/molecule/TiO/Au as examples of 'molecular heterojunctions' consisting of a molecular monolayer and a semiconducting oxide. Junctions containing fluorene bonded to pyrolyzed photoresist film (PPF) were compared to those containing AlOinstead of fluorene, and those with only the TiOlayer. The responses to voltage sweep and pulse stimulation were strongly dependent on junction composition and temperature. A transient current response lasting a few milliseconds results from injection and trapping of electrons in the TiOlayer, and occurred in all three junction types studied. Conduction in PPF/TiO/Au junctions is consistent with space charge limited conduction at low voltage, then a sharp increase in current once the space charge fills all the traps. With fluorene present, there is a slower, persistent change in junction conductance which may be removed by a reverse polarity pulse. This 'memory' effect is attributed to a redox process in the TiOwhich generates Tiand/or Ti, which have much higher conductance than TiOdue to the presence of conduction band electrons. The redox process amounts to &#x201c;dynamic doping&#x201d; of the TiOlayer by imposed electric field. The memory effect arises from a combination of the properties of the molecular and oxide layers, and is a special property of the molecular heterojunction configuration.

Electronic junction devices featuring redox electrodes

An electronic junction of the present invention comprises: (a) a first conductive component comprising: (i) a substrate having a contact surface; and (ii) at least one layer of molecular units having first and second ends, wherein at least one layer of molecular units is attached through their first ends to the contact surface through a type of association selected from the group consisting of: covalent bonding and strong electronic coupling; and (b) a second conductive component in electrical contact with the second ends of at least one layer of molecular units, the second conductive component comprising at least one metal and at least one metal oxide, wherein at least one conductive component in electronic junction has an electrical property that changes in response to a stimulus.

The present invention includes a chemical monolayer construction that comprises: (a) a substrate having a contact surface; and (b) a plurality of substantially parallel molecular units, wherein said molecular units are attached to said substrate so as to be strongly coupled electronically to said substrate, such as through a conjugated bond. The present invention also includes electronic circuit components and devices including a chemical monolayer construction of the present invention.

Chemical monolayer and micro-electronic junctions and devices containing same

Micro-electronic junctions devices containing same

Chemical monolayer field emitter device

Pixel array

Chemical monolayer memory device

The present invention includes a chemical monolayer construction that comprises: a substrate having a contact surface, and a monolayer of a plurality of substantially parallel molecular units attached to the contact surface of the substrate. The molecular units are strongly coupled electronically to the substrate. The contact surface of the substrate has a roughness value less than or equal to the average length of the molecular units. The molecular units comprise a chemical structure that is capable of being changed from a relatively non-conductive state to a relatively conductive state by the application of a stimulus. The present invention also includes electronic circuit components and devices including chemical monolayer constructions.

Method for conductance switching in molecular electronic junctions

A method of producing glassy carbon containing metal particles includes two steps. The first step is providing a metal complexed to a molecule which can cross-link to form glassy carbon. The molecule is heated so that the molecule cross-links to form glassy carbon containing metal particles. The glassy carbon can be incorporated into an electrode for use in an electrochemical cell.

Method of producing glassy carbon containing metal particles

Glassy carbons including a dispersion of metal particles having a small particle size, their synthesis, and their use in electrochemical cells are described.

Glassy carbon containing metal particles and its use on an electrode in

Electrochemically generated chromophores are measured by passing a beam of electromagnetic radiation parallel and close to the surface of the electrode at which they are being generated, and collecting the diffracted radiation. The response is so rapid (.about.0.025 sec.) that modulation is practicable and the path length, which is set by the thickness of the electrode, is much greater than in optically transparent electrodes, thus rendering the method very sensitive to weak chromophores or low concentrations.

Growing community of inventors

Worthington, OH, United States of America

Richard L McCreery