Si thin film is one of the promising candidates in the fields of optoelectronics and photovoltaics. However, its applications have been limited due to its poor optical absorption arising from the limited physical thickness. It has been demonstrated that such situation can be improved by taking advantage of plasmonic materials, which could enhance the optical absorption cross-section of Si through the near-field enhancement effect without increasing its physical thickness. However, embedding configuration is necessary in this case, which makes Ag and/or Au nanostructures are not suitable since they could induce some electrical defects. In this work, β-Sn-nanoparticles, which belong to IV group, have been employed to embed in the Si thin film to obtain composite thin film with better optoelectronic performance than pure Si thin film with same thickness. Both optical characterizations and finite element simulations indicate that such improvement could be attributed to the confined near-field induced by the embedded β-Sn-nanoparticles. This work could pave a way for the development of Si-based optoelectronic and/or photovoltaic devices.
This Conference Presentation, “β-Sn-based plasmonic materials and their near-field enhancement performance” was recorded for Photonics Asia 2021, held in Nantong, China.
Three kinds of β-Sn-based plasmonic materials, including β-Sn nanoparticles, β-Sn/graphene hybrid structures and β-Sn@Ag core@shell nanoparticles, have been prepared to explore their near-field enhancement performance. The results indicate that such materials could act as traditional noble metallic nanostructures to support tunable resonance frequency. In addition, surface enhanced Raman scattering (SERS) determinations and corresponding calculations confirm that such novel plasmonic materials not only could serve as a SERS platform, but also could be an alternate efficient plasmonic material for the Si-based optoelectronic and/or photovoltaic devices by taking advantage of the near-field enhancement effect.
Ag/Sn quasi-core/shell nanoparticles have been synthesized by a two-step reduction process at room temperature. The hybridization of elementary plasmons of Ag was detected by the photoluminescence spectra. In addition, the fluorescence quenching effect can be attributed to the strong interaction between Sn and Ag.
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