Broad-band high-gain room temperature photodetectors using semiconductor–metal nanofloret hybrids with wide plasmonic response. Issue 13 (19th March 2019)

• Record Type: Journal Article
• Authors: Ziv, Amir; Tzaguy, Avra; Sun, Zhiyuan; Yochelis, Shira; Stratakis, Emmanuel; Kenanakis, George; Schatz, George C.; Lauhon, Lincoln J.; Seidman, David N.; Paltiel, Yossi; Yerushalmi, Roie
• Is Part Of: Nanoscale. Volume 11:Issue 13(2019)
• Page Start: 6368
• Page End: 6376
• Publication Date: 2019-03-19
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c9nr00385a
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : We present an optoelectronic device for broad spectral detection using SiGe nanowires coupled to a plasmonic antenna. 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.