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Abstract
We have carried out detailed investigations on the light absorption mechanism in singlecrystalline silicon (c-Si) (core)/amorphous Si (a-Si) (shell) coaxial nanowires (NWs). Basedon the Lorenz–Mie light scattering theory, we have found that the light absorption in thecoaxial NWs relies on the leaky mode resonances and that the light absorption can beoptimized towards photovoltaic applications when the a-Si shell thickness is about twicethe c-Si core radius. The photocurrent has been found to be enhanced up to ∼ 560% compared to c-Si NWs, and to be further enhanced up to ∼ 60% by coating the nonabsorbing dielectric shells.
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