Metalorganic chemical vapor deposition of iron disulfide and its use for solar energy conversion

Ahmed Ennaoui; Sebastian Fiechter; Ralf Vogel; M. Giersig; Horst Weller; Helmut Tributsch

doi:10.1117/12.130567

9 December 1992 Metalorganic chemical vapor deposition of iron disulfide and its use for solar energy conversion

Ahmed Ennaoui, Sebastian Fiechter, Ralf Vogel, M. Giersig, Horst Weller, Helmut Tributsch

Proceedings Volume 1729, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Photovoltaics, Photochemistry, Photoelectrochemistry; (1992) https://doi.org/10.1117/12.130567
Event: Optical Materials Technology for Energy Efficiency and Solar Energy, 1992, Toulouse-Labege, France

Abstract

Thin polycrystalline films of iron disulfide have been grown on different substrates by chemical vapour deposition. The films were characterized using optical absorption and TEM. RBS and EDAX analysis has been used to explore the chemical stoichiometry. XRD and FTIR allowed the identification of both FeS₂ phases pyrite and marcasite. A novel method for sensitization of highly porous Ti0₂ elecrodes with ultra thin (10-20 nm) polycrystalline films of FeS₂ (pyrite) is presented. Photoelectrochemical solar cell using the above electrode generated high photovoltage of up to 600mV compared with single crystalline electrode (200 mV). In this device the semiconductor with a small band gap and high absorption coefficient (FeS₂ pyrite; E_G = 0.9 eV; a = 6 x 10⁵ cm^-1) absorbs the light and injects electrons into the conduction band the wide band gap semiconductor (Ti0₂ anatase; E_G = 3.2 eV). Regeneration of holes is taking place by electron transfer from redox system in the electrolyte.

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Ahmed Ennaoui, Sebastian Fiechter, Ralf Vogel, M. Giersig, Horst Weller, and Helmut Tributsch "Metalorganic chemical vapor deposition of iron disulfide and its use for solar energy conversion", Proc. SPIE 1729, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Photovoltaics, Photochemistry, Photoelectrochemistry, (9 December 1992); https://doi.org/10.1117/12.130567

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KEYWORDS

Pyrite

Crystals

Iron

Solar energy

Metalorganic chemical vapor deposition

FT-IR spectroscopy

Absorption

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