Photoelectric properties of ITO/CdS/Chlorophyll a/Ag heterojunction solar cells

J. Ségui, S. Hotchandani, D. Baddou, Roger Leblanc

Research output: Contribution to journalArticle

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Abstract

The heterojunction ITO/CdS/Chl a/Ag (Chl a = chlorophyll a) solar cells have been prepared by sequential electrodeposition of CdS and Chl a onto conductive indium-tin oxide (ITO) electrode followed by vacuum deposition of Ag, and their photovoltaic studies have been carried out. The dark J-V and photovoltaic characteristics, especially the action spectra, suggest the presence of a barrier at CdS/Chl a interface. Various photovoltaic parameters of the cells obtained for the incident light power of 20 μW/cm2 at 740 nm, the maximum of Chl a absorption in red region, are as follows: JSC ≃ 150-200 nA/cm2, VOC ≈ 0.35-0.40 V, ff = 0.26, and η (%) = 0.17. The measurements performed at three wavelengths, namely, 740, 680, and 560 nm, indicate that the cells (illuminated through CdS electrode) perform better for weakly absorbed light at 560 nm. The results further show that the use of CdS instead of Al as rectifying electrode has definitely led to an improvement in the performance of CdS/Chl a over Al/Chl a cells in terms of the decreased internal resistances, decreased dark current and voltage, increased fill factors, and increased power conversion efficiencies. This has been attributed to the elimination of insulating layer of Al2O3 existing at Al/Chl a interface.

Original languageEnglish
Pages (from-to)8807-8812
Number of pages6
JournalJournal of Physical Chemistry
Volume95
Issue number22
StatePublished - Dec 1 1991
Externally publishedYes

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chlorophylls
Chlorophyll
Tin oxides
indium oxides
Indium
tin oxides
Heterojunctions
heterojunctions
Solar cells
solar cells
Electrodes
electrodes
cells
Vacuum deposition
vacuum deposition
Dark currents
volatile organic compounds
dark current
Volatile organic compounds
Electrodeposition

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Photoelectric properties of ITO/CdS/Chlorophyll a/Ag heterojunction solar cells. / Ségui, J.; Hotchandani, S.; Baddou, D.; Leblanc, Roger.

In: Journal of Physical Chemistry, Vol. 95, No. 22, 01.12.1991, p. 8807-8812.

Research output: Contribution to journalArticle

Ségui, J. ; Hotchandani, S. ; Baddou, D. ; Leblanc, Roger. / Photoelectric properties of ITO/CdS/Chlorophyll a/Ag heterojunction solar cells. In: Journal of Physical Chemistry. 1991 ; Vol. 95, No. 22. pp. 8807-8812.
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