Accession Number:

ADA125856

Title:

Semiconductor Electrodes. 50. Effect of Mode of Illumination and Doping on Photoelectrochemical Behavior of Phthalocyanine Films.

Descriptive Note:

Technical rept. 1 Sep 82-1 Aug 83,

Corporate Author:

TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY

Report Date:

1983-02-25

Pagination or Media Count:

46.0

Abstract:

The behavior of photoelectrochemical PED cells composed of Sno2 or Pt electrodes with coatings of different phthalocyanines Pc -H2PC, ZnPc, MgPc, CuPc, InPc 1 was investigated. Spectral sensitization at the Sn02Pc interface leads to photooxidation currents, while efficient photoreduction occurs at the Pcsolution interface through bulk generation of charge carriers. The presence of both anodic and cathodic photocurrents leads to different net photocurrent responses for back and front side illumination, especially with thicker films. The efficiency of the reduction process was sensitive to the potential of the redox couple in solution and maximized when E redox was about 0.37V for N2Pc, ZnPc and -MgPc. A dramatic improvement of the photoelectrochemical behavior of the coating results from doping with an electron acceptor e.g.,o-chloranil and quantum yields as high a s 4.6 were measured for PtH2Pc electrodes.

Subject Categories:

  • Electrical and Electronic Equipment
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE