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 language | English (US) |
|---|---|
| Pages (from-to) | 2134-2144 |
| Number of pages | 11 |
| Journal | Journal of the Electrochemical Society |
| Volume | 132 |
| Issue number | 9 |
| DOIs | |
| State | Published - Sep 1985 |
| Externally published | Yes |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Materials Chemistry
- Surfaces, Coatings and Films
- Electrochemistry
- Renewable Energy, Sustainability and the Environment