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

Salvator Nsengiyumva, Chouhaid Nasr, Surat Hotchandani, Roger M. Leblanc

Research output: Contribution to journalArticle

1 Scopus citations

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

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

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