Broad-band high-gain room temperature photodetectors using semiconductor-metal nanofloret hybrids with wide plasmonic response

Amir Ziv, Avra Tzaguy, Zhiyuan Sun, Shira Yochelis, Emmanuel Stratakis, George Kenanakis, George C Schatz, Lincoln J. Lauhon, David N. Seidman, Yossi Paltiel, Roie Yerushalmi

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Abstract

Semiconducting nanowires are widely studied as building blocks for electro-optical devices; however, their limited cross-section and hence photo-response hinder the utilization of their full potential. Herein, we present an opto-electronic device for broad spectral detection ranging from the visible (VIS) to the short wavelength infra-red (SWIR) regime, using SiGe nanowires coupled to a broadband plasmonic antenna. The plasmonic amplification is obtained by deposition of a metallic nanotip at the edge of a nanowire utilizing a bottom-up synthesis technique. The metallic nanotip is positioned such that both optical plasmonic modes and electrical detection paths are coupled, resulting in a specific detectivity improvement of ∼1000 compared to conventional SiGe NWs. Detectivity and high gain are also measured in the SWIR regime owing to the special plasmonic response. Furthermore, the temporal response is improved by ∼1000. The fabrication process is simple and scalable, and it relies on low-resolution and facile fabrication steps with minimal requirements for top-down techniques.

Original languageEnglish
Pages (from-to)6368-6376
Number of pages9
JournalNanoscale
Volume11
Issue number13
DOIs
Publication statusPublished - Jan 1 2019

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ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Ziv, A., Tzaguy, A., Sun, Z., Yochelis, S., Stratakis, E., Kenanakis, G., ... Yerushalmi, R. (2019). Broad-band high-gain room temperature photodetectors using semiconductor-metal nanofloret hybrids with wide plasmonic response. Nanoscale, 11(13), 6368-6376. https://doi.org/10.1039/C9NR00385A