High-performance Si microwire photovoltaics
Crystalline Si wires, grown by the vapor-liquid-solid (VLS) process, have emerged as promising candidate materials for low-cost, thin-film photovoltaics. Here, we demonstrate VLS-grown Si microwires that have suitable electrical properties for high-performance photovoltaic applications, including lo...
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| Veröffentlicht in: | Energy & environmental science 2011-01, Vol.4 (3), p.866-871 |
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| creator | Kelzenberg, Michael D Turner-Evans, Daniel B Putnam, Morgan C Boettcher, Shannon W Briggs, Ryan M Baek, Jae Yeon Lewis, Nathan S Atwater, Harry A |
| description | Crystalline Si wires, grown by the vapor-liquid-solid (VLS) process, have emerged as promising candidate materials for low-cost, thin-film photovoltaics. Here, we demonstrate VLS-grown Si microwires that have suitable electrical properties for high-performance photovoltaic applications, including long minority-carrier diffusion lengths (Ln [dbl greater-than] 30 [small micro]m) and low surface recombination velocities (S [double less-than] 70 cm[middle dot]s-1). Single-wire radial p-n junction solar cells were fabricated with amorphous silicon and silicon nitride surface coatings, achieving up to 9.0% apparent photovoltaic efficiency, and exhibiting up to [similar]600 mV open-circuit voltage with over 80% fill factor. Projective single-wire measurements and optoelectronic simulations suggest that large-area Si wire-array solar cells have the potential to exceed 17% energy-conversion efficiency, offering a promising route toward cost-effective crystalline Si photovoltaics. |
| doi_str_mv | 10.1039/C0EE00549E |
| format | Article |
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| source | Royal Society Of Chemistry Journals 2008-; Alma/SFX Local Collection |
| subjects | Crystal structure Diffusion length Electric potential Electrical properties electrodes - solar materials and chemistry by design optics phonons Photovoltaic cells Silicon solar (photovoltaic) Solar cells SOLAR ENERGY solid state lighting synthesis (novel materials) synthesis (self-assembly) thermal conductivity Voltage |
| title | High-performance Si microwire photovoltaics |
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