Photoanodic behavior of vapor-liquid-solid–grown, lightly doped, crystalline Si microwire arrays
Arrays of n-Si microwires have to date exhibited low efficiencies when measured as photoanodes in contact with a 1-1'-dimethylferrocene (Me sub(2)Fc super(+/0))-CH sub(3)OH solution. Using high-purity Au or Cu catalysts, arrays of crystalline Si microwires were grown by a vapor-liquid-solid pro...
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Veröffentlicht in: | Energy & environmental science 2012-05, Vol.5 (5), p.6867-6871 |
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Sprache: | eng |
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Zusammenfassung: | Arrays of n-Si microwires have to date exhibited low efficiencies when measured as photoanodes in contact with a 1-1'-dimethylferrocene (Me sub(2)Fc super(+/0))-CH sub(3)OH solution. Using high-purity Au or Cu catalysts, arrays of crystalline Si microwires were grown by a vapor-liquid-solid process without dopants, which produced wires with electronically active dopant concentrations of 1 10 super(13) cm super(-3). When measured as photoanodes in contact with a Me sub(2)Fc super(+/0)-C H sub(3)OH solution, the lightly doped Si microwire arrays exhibited greatly increased fill factors and efficiencies as compared to n-Si microwires grown previously with a lower purity Au catalyst. In particular, the Cu-catalyzed Si microwire array photoanodes exhibited open-circuit voltages of similar to 0.44 V, carrier-collection efficiencies exceeding similar to 0.75, and an energy-conversion efficiency of 1.4% under simulated air mass 1.5 G illumination. Lightly doped Cu-catalyzed Si microwire array photoanodes have thus demonstrated performance that is comparable to that of optimally doped p-type Si microwire array photocathodes in photoelectrochemical cells. |
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ISSN: | 1754-5692 1754-5706 |
DOI: | 10.1039/c2ee03468a |