Pyrite (FeS2) is a naturally abundant and nontoxic material with a suitable bandgap of 0.95 eV and high absorption coefficient.  It is a potential candidate for incorporation into solar-energy-conversion devices.  FeS2 / I3�(aq), I�(aq) half-cells have displayed near-unity photon-to-electron conversion efficiency but low photovoltages (~ 200 mV).  Both computational and experimental results suggest that deleterious surface chemistry has limited the achieved photovoltages.  It is not known which chemical surface species limit performance, or how to remove those species and prevent their formation.  The photoelectrochemistry of FeS2 / liquid half-cells has been investigated as a function of surface-chemical treatments.  This poster presents the correlation between surface treatments (e.g. chemical or thermal), resulting surface chemistry, and photoelectrochemistry.

Correlation between surface and near-surface chemistry of FeS<sub>2</sub> and the photoelectrochemistry of FeS<sub>2</sub>/liquid half-cells

248th National Meeting (2014)

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Correlation between surface and near-surface chemistry of FeS2 and the photoelectrochemistry of FeS2/liquid half-cells

Correlation between surface and near-surface chemistry of FeS₂ and the photoelectrochemistry of FeS₂/liquid half-cells