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arXiv · 1107.2769

The excitonic resonance in semiconductor-metal nano-hybrids

Juan I. Climente·Jose L. Movilla·Guido Goldoni·Josep Planelles
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Abstract

We use a configuration interaction approach within the envelope function approximation to study the nature of the excitonic resonance in nano-hybrids, composite nanoparticles (NPs) combining a semiconducting and a metallic segment in contact. With reference to recent experimental reports, we specifically study CdS-based nanorods with metallic NPs deposited at the tips (matchstick) or metallic coatings (core-shell). The excitonic states are computed taking into account both the renormalization of the electron-hole interaction and self-energy effects induced by the the metallic segment on the electron-hole pair, as well as by the dielectric environment, through an induced charge numerical approach. In neutral matchstick structures the metal NP has only a minor influence (~1 meV) on the excitonic states. When the metallic NP is charged the exciton becomes rapidly redshifted and spatially indirect. In contrast, in neutral core-shell structures the exciton energy redshifts by tens of meV

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Juan I. Climente, Jose L. Movilla, Guido Goldoni, Josep Planelles. 2011-07-15. The excitonic resonance in semiconductor-metal nano-hybrids. https://doi.org/10.1021/jp2047757

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