Capacitance measurements of photovoltaic cells based on mixed monolayers of chlorophyll a and sulfoquinovosyldiacylglycerol

Salvator Nsengiyumva, Chouhaid Nasr, Surat Hotchandani, Roger Leblanc

Research output: Contribution to journalArticle

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Abstract

The capacitance measurements of Al/Chlorophyll a/Ag and Al/Chlorophyll a-Sulfoquinovosyldiacylglycerol/Ag sandwich cells have been carried out at different frequencies in dark and under illumination. The results show that while a voltage-dependent capacitance and a linear 1/C2 versus Va plot is obtained for chlorophyll a (Chl a) at low frequencies, the addition of sulfoquinovosyldiacylglycerol (SQDG) in proportions ∼0.25 results in totally voltage-invariant capacitance. The capacitance characteristic of Chl a-SQDG (0.25) cells resemble more those for an insulator than those for a Schottky barrier. These results are explained in terms of negatively charged SQDG playing a role of traps which immobilize the holes. Alternatively, the interaction of negative polar head group of SQDG with Mg2+ of Chl a can also be invoked as a possible reason for the observed results. The bound Chl a-SQDG species possibly does not form a Schottky barrier or forms a weak barrier with either Al or Ag electrodes, resulting in insulator-like capacitance characteristics of Al/Chl a-SQDG(0.25)/Ag cells.

Original languageEnglish
Pages (from-to)211-225
Number of pages15
JournalSolar Energy Materials and Solar Cells
Volume45
Issue number3
StatePublished - Feb 15 1997

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Capacitance measurement
Photovoltaic cells
Chlorophyll
Monolayers
Capacitance
Electric potential
chlorophyll a
Lighting
Electrodes

Keywords

  • Capacitance measurements
  • Mixed monolayers
  • Photovoltaics

ASJC Scopus subject areas

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

Cite this

Capacitance measurements of photovoltaic cells based on mixed monolayers of chlorophyll a and sulfoquinovosyldiacylglycerol. / Nsengiyumva, Salvator; Nasr, Chouhaid; Hotchandani, Surat; Leblanc, Roger.

In: Solar Energy Materials and Solar Cells, Vol. 45, No. 3, 15.02.1997, p. 211-225.

Research output: Contribution to journalArticle

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AB - The capacitance measurements of Al/Chlorophyll a/Ag and Al/Chlorophyll a-Sulfoquinovosyldiacylglycerol/Ag sandwich cells have been carried out at different frequencies in dark and under illumination. The results show that while a voltage-dependent capacitance and a linear 1/C2 versus Va plot is obtained for chlorophyll a (Chl a) at low frequencies, the addition of sulfoquinovosyldiacylglycerol (SQDG) in proportions ∼0.25 results in totally voltage-invariant capacitance. The capacitance characteristic of Chl a-SQDG (0.25) cells resemble more those for an insulator than those for a Schottky barrier. These results are explained in terms of negatively charged SQDG playing a role of traps which immobilize the holes. Alternatively, the interaction of negative polar head group of SQDG with Mg2+ of Chl a can also be invoked as a possible reason for the observed results. The bound Chl a-SQDG species possibly does not form a Schottky barrier or forms a weak barrier with either Al or Ag electrodes, resulting in insulator-like capacitance characteristics of Al/Chl a-SQDG(0.25)/Ag cells.

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