Organic/inorganic molecular beam epitaxy: photoelectrochemical and optical properties of epitaxially deposited single-component and multiple-component organic superlattices (Invited Paper)

Neal R. Armstrong, Lai K. Chau, Greg E. Collins, S. Y. Chen, Ken W. Nebesny, Valorie A. Williams, Paul A. Lee, C. Arbour, James L. Danziger, E. Osburn, D. F. O'Brien, B. A. Parkinson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We discuss here our most recent results with the characterization of epitaxial deposits of various phthalolcyanine dyes formed by vacuum deposition (O/I-MBE) or solution deposition on the surface of metal dichalcogenide semiconductors, such as SnS2. Surface electron diffraction techniques used during the vacuum deposition process help to verify the type and extent of long range ordering of these dyes. SnS2 semiconductor substrates allow for the photoelectrochemical characterization of the dye layers, starting with the deposition of submonolayer amounts of material. High quantum yields per absorbed photon are seen for ultrathin films of InPc-Cl, VOPc, and CuPc on SnS2, and the photocurrent spectra suggest similar ordering at the monolayer level, even though multilayer structures are quite different. Ordered Pc thin films are also obtained for a new class of liquid crystalline phthalocyanines (LC-Pc), where the hydrocarbon side chains are attached to the Pc ring by amide linkages. Deposition of ultrathin films of these materials produces photocurrent spectra which are quite similar to those obtained for low coverages of the vacuum deposited Pc. Photocurrent spectra on SnS2 show that the first monolayer of material may have a completely different surface structure than the bulk of the multilayer LC-Pc thin film. The nature of dye/dye' interfaces and their effect on exciton dissociation events has also been explored using vacuum deposited materials. Superlattices of Pcs were formed by vacuum deposition, where the active dye was sandwiched between various spacer molecules with thicknesses down to a few molecular layers. Transient photocurrent yield spectra from such assemblies suggests that exciton dissociation events in such materials can be confined to within a few molecular layers of the dye/dye' interface.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherPubl by Int Soc for Optical Engineering
Pages2-12
Number of pages11
ISBN (Print)0819409022, 9780819409027
DOIs
StatePublished - Jan 1 1992
EventOptical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Selective Materials, Concentrators and Reflectors, Transparent Insulation and Superwindows - Toulouse, Fr, France
Duration: May 19 1992May 21 1992

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume1729
ISSN (Print)0277-786X

Conference

ConferenceOptical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Selective Materials, Concentrators and Reflectors, Transparent Insulation and Superwindows
CountryFrance
CityToulouse, Fr
Period5/19/925/21/92

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Armstrong, N. R., Chau, L. K., Collins, G. E., Chen, S. Y., Nebesny, K. W., Williams, V. A., Lee, P. A., Arbour, C., Danziger, J. L., Osburn, E., O'Brien, D. F., & Parkinson, B. A. (1992). Organic/inorganic molecular beam epitaxy: photoelectrochemical and optical properties of epitaxially deposited single-component and multiple-component organic superlattices (Invited Paper). In Proceedings of SPIE - The International Society for Optical Engineering (pp. 2-12). (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 1729). Publ by Int Soc for Optical Engineering. https://doi.org/10.1117/12.130578