Tri-and Tetravalent Phthalocyanine Thin Film Photoelectrodes: Comparison with Other Metal and Demetallated Phtholocyonine Systems

T. J. Klofta, W. J. Buttner, A. Nanthakumar, T. D. Mewborn, N. R. Armstrong

Research output: Contribution to journalArticle

42 Scopus citations

Abstract

A series of trivalent and tetravalent metal phthalocyanines (Pc) has been examined in thin film form on metal substrates by electron microscopy, UV-visible spectrophotometry, and electrochemical and photoelectrochemical techniques. These Pc's are compared with other divalent metal and demetallated phthalocyanines. The tri-and tetravalent phthalocyanines show enhanced photoresponses vs. the divalent metal and demetallated systems. This enhanced activity correlates with their broadened and red-shifted visible spectra and their tendency to grow as block-like or platelet-like microcrystals in the thin film. The divalent and demetallated Pc's grow as smaller, needle-like deposits with poor photoresponses. The trivalent and tetravalent Pc's have been grown in this study as thin films that act as highly doped p-type photoelectrodes or as nearly intrinsic photoconductors, exhibiting both positive and negative photopotentials, depending upon the E°' of the redox couple.

Original languageEnglish (US)
Pages (from-to)2134-2144
Number of pages11
JournalJournal of the Electrochemical Society
Volume132
Issue number9
DOIs
StatePublished - Sep 1985

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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