Soluble polyacetylenes derived from the ring-opening metathesis polymerization of substituted cyclooctatetraenes: electrochemical characterization and Schottky barrier devices

Thomas H. Jozefiak; Michael J. Sailor; Eric J. Ginsburg; Christopher B. Gorman; Nathan Saul Lewis; Robert H. Grubbs

doi:10.1117/12.45109

1 March 1991 Soluble polyacetylenes derived from the ring-opening metathesis polymerization of substituted cyclooctatetraenes: electrochemical characterization and Schottky barrier devices

Thomas H. Jozefiak, Michael J. Sailor, Eric J. Ginsburg, Christopher B. Gorman, Nathan Saul Lewis, Robert H. Grubbs

Author Affiliations +

Proceedings Volume 1436, Photochemistry and Photoelectrochemistry of Organic and Inorganic Molecular Thin Films; (1991) https://doi.org/10.1117/12.45109
Event: Optics, Electro-Optics, and Laser Applications in Science and Engineering, 1991, Los Angeles, CA, United States

Abstract

Recent developments in ring-opening metathesis polymerization (ROMP) have enabled the synthesis of poly-cyclooctatetraene (poly-COT), a material which is isostructural to polyacetylene. This liquid-phase polymerization method allows facile construction of interfaces, films, and devices with polyacetylene-like materials. The ROMP method also allows the preparation of soluble, yet highly conjugated polyacetylene analogs from substituted cyclooctatetraenes (R-COT). The redox characteristics of R-COT polymers were investigated at electrodes modified with thin polymer films. Voltammetric methods were used to characterize the redox response, band gap, electrochemical doping, and cis-trans isomerization properties of these polyenes. We have applied poly-COT technology to the fabrication of Schottky diodes and photoelectrochemical cells, by forming poly-COT films on semiconductor surfaces. The resultant semiconductor/organic-metal interfaces behave more ideally than semiconductor contacts with conventional metals, in that changes in the work function of the conducting polymer exert a large and predictable effect on the electrical properties of the resulting Schottky diodes. Transparent films of the solution-processible polymer poly- trimethylsilyl-cyclooctatetraene (poly-TMS-COT) have been cast onto n-silicon substrates and doped with iodine to form surface barrier solar cells. These devices produce photovoltages that are much larger than can be obtained from n-silicon contacts with conventional metals.

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Thomas H. Jozefiak, Michael J. Sailor, Eric J. Ginsburg, Christopher B. Gorman, Nathan Saul Lewis, and Robert H. Grubbs "Soluble polyacetylenes derived from the ring-opening metathesis polymerization of substituted cyclooctatetraenes: electrochemical characterization and Schottky barrier devices", Proc. SPIE 1436, Photochemistry and Photoelectrochemistry of Organic and Inorganic Molecular Thin Films, (1 March 1991); https://doi.org/10.1117/12.45109

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