Abstract
n-Type Si has been shown to serve as a stable photoanode in a cell for the conversion of light to electricity. The other components of the cell are a Pt cathode and an electrolyte consisting of an ethanol solution of [n-Bu4N]ClO4 with a redox couple of ferricenium/ferrocene. Data from a two-compartment cell show that ferrocene is oxidized to ferricenium with 100 ± 2% current efficiency at the Si photoanode. Furthermore, prolonged irradiation of the Si in a one-compartment cell yields constant photocurrent and output characteristics. The maximum open-circuit photopotential is ∼700 mV, and the short-circuit quantum yield for electron flow at low light intensity exceeds 0.5. Conversion of monochromatic 632.8-nm light to electricity with ∼2% power efficiency at an output voltage of ∼200 mV has been sustained. These results represent a stable n-type Si-based photoelectrochemical cell.
Keywords: optical energy conversion, solar energy, photoelectrochemistry, Si photoelectrodes
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Selected References
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