Dark signals and photovoltaic properties of Al/chlorophyll a/Ag cells

M. Mabrouki, A. Oueriagli, A. Outzourhit, E. L. Ameziane, S. Hotchandani, Roger Leblanc

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The electrical characteristics of Al/chlorophyll a/Ag (Al/Chi a/Ag) structures, prepared by electrodeposition of chlorophyll a onto vacuum evaporated aluminum and followed by evaporation of silver (Ag) top electrode, are presented. It was found that these cells present a short-circuit current and an open-circuit voltage in the dark which both evolve with the aging time. An analysis of the I-V characteristics suggests that these dark signals are due to electrochemical reactions at the Al/Chl a interface and to thermally detrapped carriers in the Chi a film. Furthermore, the temperature dependence of the I-V characteristics of these cells revealed a change in the conduction mechanisms in the Chi a film around 15 °C. This is further confirmed by studying the variations of the photocurrent with temperature. The conversion efficiency of these cells was found to be on the order of 0.1%. A comparison of the action spectra of the cells and the absorption spectra of the Chl a films suggested that the photogeneration of free carriers is governed by the ionization of the photogenerated excitons.

Original languageEnglish
Pages (from-to)345-354
Number of pages10
JournalPhysica Status Solidi (A) Applied Research
Volume191
Issue number1
DOIs
StatePublished - May 1 2002

Fingerprint

chlorophylls
Chlorophyll
cells
Open circuit voltage
Aluminum
Photocurrents
Silver
Electrodeposition
Excitons
Short circuit currents
Conversion efficiency
Ionization
Absorption spectra
Evaporation
short circuit currents
Aging of materials
open circuit voltage
Cells
electrodeposition
Vacuum

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Dark signals and photovoltaic properties of Al/chlorophyll a/Ag cells. / Mabrouki, M.; Oueriagli, A.; Outzourhit, A.; Ameziane, E. L.; Hotchandani, S.; Leblanc, Roger.

In: Physica Status Solidi (A) Applied Research, Vol. 191, No. 1, 01.05.2002, p. 345-354.

Research output: Contribution to journalArticle

Mabrouki, M. ; Oueriagli, A. ; Outzourhit, A. ; Ameziane, E. L. ; Hotchandani, S. ; Leblanc, Roger. / Dark signals and photovoltaic properties of Al/chlorophyll a/Ag cells. In: Physica Status Solidi (A) Applied Research. 2002 ; Vol. 191, No. 1. pp. 345-354.
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