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Time-resolved photocurrent generation in a photoelectrochemical cell with phthalocyanine

Domenii publicaţii > Chimie + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Danuta Wróbel, Andrzej Boguta, Aleksandra Wójcik and Rodica M. Ion

Editorial: Elsevier, SPECTROCHIMICA ACTA PART A: MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, Volume 61, Issue 6, p.1025-1278, 2005.

Rezumat:

The kinetics of photocurrent generated in the photoelectrochemical cell (PEC) with phthalocyanine (Pc) dyes in the microsecond time scale was discussed. The shape of the kinetics is rather complex and it was discussed in terms of molecular phenomena and electrochemical processes occurring after laser flash illumination. Time constants were calculated from the photocurrent decay curves and at least three time components were well recognized (rise in 0.40 μs, declining in 0.40–0.45 μs and secondary increase in about 2 μs). The shape of the kinetics was discussed in terms of dye singlet and triplet state participation in photocurrent generation and also in terms of creation of the Helmholtz–Goy double layer at the dye layer–semiconductor interface. The alteration in shape of the Helmholtz–Goy double layer in photoelectrochemical cell after laser pulse was also discussed.

Cuvinte cheie: Helmholtz–Goy double layer; Laser induced photocurrent kinetics; Phthalocyanine; Photoelectrochemical cell

URL: http://elsevier.com/locate/saa