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Photoelectrochemical Redox Metal Deposition On an Organic Polymer Film

IP.com Disclosure Number: IPCOM000102619D
Original Publication Date: 1990-Dec-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 78K

Publishing Venue

IBM

Related People

Kovac, CA: AUTHOR [+2]

Abstract

It has been shown that metals can be deposited onto electroactive polymer films through direct electrochemical reduction (1) and through a chemical redox-mediated process confined to a polyimide surface (2). Described is an electrochemical method for forming a patterned conductive metal layer on an electroactive polymer film. Selective metal deposition is accomplished through photoelectrochemical reduction of the polymer film on a semiconductor electrode and subsequent electron transport to the polymer/solution interface. The operation of this process requires that the electroactive polymer film be provided onto a p-type semiconductor (e.g., p-Si, p-GaP, p-InP) electrode which acts as the photocathode in an electrochemical cell.

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Photoelectrochemical Redox Metal Deposition On an Organic Polymer Film

       It has been shown that metals can be deposited onto
electroactive polymer films through direct electrochemical reduction
(1) and through a chemical redox-mediated process confined to a
polyimide surface (2).  Described is an electrochemical method for
forming a patterned conductive metal layer on an electroactive
polymer film.  Selective metal deposition is accomplished through
photoelectrochemical reduction of the polymer film on a semiconductor
electrode and subsequent electron transport to the polymer/solution
interface.  The operation of this process requires that the
electroactive polymer film be provided onto a p-type semiconductor
(e.g., p-Si, p-GaP, p-InP) electrode which acts as the photocathode
in an electrochemical cell.  To complete the electrochemical circuit,
the cell is provided with an anode and electrolyte solution
containing metal ions or complexes.  Selective metal deposition onto
the polymer surface is accomplished by irradiating the semiconductor
substrate with light having energy greater than the bandgap while
under a cathodic bias. The space charge region at the
semiconductor/polymer interface allows separation of photogenerated
electron- hole pairs.  Electrons supplied at the interface are
transferred to the polymer causing polymer reduction.  The electrons
are then transported through the polymer films via a "hopping"
mechanism which involves concurrent transport of counter ions in the...