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Photoinitiated Doping

IP.com Disclosure Number: IPCOM000051445D
Original Publication Date: 1981-Jan-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 17K

Publishing Venue

IBM

Related People

Clarke, TC: AUTHOR [+4]

Abstract

We have found a procedure for controllably enhancing the conductivity o selected areas of a polyacetylene film using a photochemical technique. Polyacetylene films can be dipped into solutions of triarylsulfonium or diaryliodonium (II) salts to impregnate the films with these materials. Methylene chloride, acetone, and Ar(3)S/+/X/-/ Ar(2)I/+/X/-/. I II. have all proved to be convenient solvents for this purpose. We have used hexafluoroarsenate (X=AsF(6)/-/) and tetrafluoroborate (X=BF(4)/-/ salts, but any anion of a strong proton acid should be effective. After drying, the films were irradiated with a 450-watt medium pressure mercury lamp for periods of time ranging from 5 to 15 minutes.

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Photoinitiated Doping

We have found a procedure for controllably enhancing the conductivity o selected areas of a polyacetylene film using a photochemical technique. Polyacetylene films can be dipped into solutions of triarylsulfonium or diaryliodonium (II) salts to impregnate the films with these materials. Methylene chloride, acetone, and Ar(3)S/+/X/-/ Ar(2)I/+/X/-/.

I II. have all proved to be convenient solvents for this purpose. We have used hexafluoroarsenate (X=AsF(6)/-/) and tetrafluoroborate (X=BF(4)/-/ salts, but any anion of a strong proton acid should be effective. After drying, the films were irradiated with a 450-watt medium pressure mercury lamp for periods of time ranging from 5 to 15 minutes. The exposed portions of these films show dramatic enhancements in conductivity. To date we have achieved conductivities as high as 1-10 ohm cm/-1/. For comparison, the intrinsic conductivity of undoped polyacetylene is approximately 10/-9/ ohm/-1/cm/-1/. As expected, when a film w dipped only half way into the salt solution, then dried and irradiated, enhanced conductivity was observed only in the treated area of the film.

To demonstrate the potential for pattern generation, the following experiment was performed. A strip of polyacetylene 3 mm by 15 mm was dipped into a methylene chloride solution of triphenylsulfonium hexafluoroarsenate. After drying, the sample was mounted on a black background. A 3 mm wide strip of Al foil was then mounted on the polyacet...