Optical Properties of Crystalline-Amorphous Core-Shell Silicon Nanowires
Optical Properties of Crystalline-Amorphous Core-Shell Silicon Nanowires
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DOI：
10.1021/nl102183x
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发表时间：
2010-10-01
期刊：
影响因子：
10.8
通讯作者：
Karim, K. S.
中科院分区：
文献类型：
--
作者：
Adachi, M. M.;Anantram, M. P.;Karim, K. S.
研究了一种由晶体硅芯和非晶硅共形壳层组成的纳米线异质结构中的光吸收。我们表明，它们在短波长（λ<550nm）下呈现出高达95%的极高吸收率，同时在长波长（λ>780nm）下吸收率极低，可低至小于2%。这些结果表明我们的纳米线在带隙中没有光学活性能级。观察到硅纳米线阵列的吸收边随着纳米线整体直径的变化而向长波长方向移动。纳米线阵列的近红外吸收明显优于薄膜非晶硅。这些特性表明其在大面积光电子和光伏应用中具有潜在用途。
The optical absorption in a nanowire heterostructure consisting of a crystalline silicon core surrounded by a conformal shell of amorphous silicon is studied We show that they exhibit extremely high absorption of 95% at short wavelengths lambda < 550 nm) and a concomitant very low absorption of down to less than 2 % at long wavelengths lambda > 780 nm) These results indicate that our nanowires do not have optically active energy levels in the band gap The absorption edge of silicon nanowires arrays is observed to shift to longer wavelengths as a function of the overall nanowire diameter The near-infrared absorption of the nanowire array is significantly better than that of thin film amorphous silicon These properties indicate potential use in large area optoelectronic and photovoltaic applications