Si Microwire Solar Cells: Improved Efficiency with a Conformal SiO2 Layer
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- Si Microwire Solar Cells: Improved Efficiency with a Conformal SiO2 Layer
- Seo, Kwanyong; Yu, Young J.; Duane, Peter; Zhu, Wenqi; Park, Hyunsung; Wober, Munib; Crozier, Kenneth B.
- antireflection; light trapping; microwire; radial junction; silicon; solar cells
- Issue Date
- AMER CHEMICAL SOC
- ACS NANO, v.7, no.6, pp.5539 - 5545
- Silicon microwire arrays have attracted considerable attention recently due to the opportunity they present as highly efficient and cost-effective solar cells. In this study, we report on efficient Si microwire array solar cells with areas of 1 cm2 and Air Mass 1.5 Global conversion efficiencies of up to 10.6%. These solar cells show an open-circuit voltage of 0.56 V, a short-circuit current density of 25.2 mA/cm2, and a fill factor of 75.2%, with a silicon absorption region that is only 25 μm thick. In particular, the maximum overall efficiency of the champion device is improved from 8.71% to 10.6% by conformally coating the wires with a 200 nm thick SiO2 layer. Optical measurements reveal that the layer reduces reflection significantly over the entire visible range.
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