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Ge–Ge0.92Sn0.08 core–shell single nanowire infrared photodetector with superior characteristics for on-chip optical communication.

Authors :
Singh, Sudarshan
Mukherjee, Subhrajit
Mukherjee, Samik
Assali, Simone
Luo, Lu
Das, Samaresh
Moutanabbir, Oussama
Ray, Samit K.
Source :
Applied Physics Letters. 4/25/2022, Vol. 120 Issue 17, p1-6. 6p.
Publication Year :
2022

Abstract

Recent development on Ge1−xSnx nanowires with high Sn content, beyond its solid solubility limit, makes them attractive for all group-IV Si-integrated infrared photonics at the nanoscale. Herein, we report a chemical vapor deposition-grown high Sn-content Ge–Ge0.92Sn0.08 core–shell based single nanowire photodetector operating at the optical communication wavelength of 1.55 μm. The atomic concentration of Sn in nanowires has been studied using x-ray photoelectron and Raman spectroscopy data. A metal–semiconductor–metal based single nanowire photodetector, fabricated via an electron beam lithography process, exhibits significant room-temperature photoresponse even at zero bias. In addition to the high-crystalline quality and identical shell composition of the nanowire, the efficient collection of photogenerated carriers under an external electric field results in the superior responsivity and photoconductive gain as high as ∼70.8 A/W and ∼57, respectively, at an applied bias of −1.0 V. The extra-ordinary performance of the fabricated photodetector demonstrates the potential of GeSn nanowires for future Si CMOS compatible on-chip optical communication device applications. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00036951
Volume :
120
Issue :
17
Database :
Academic Search Index
Journal :
Applied Physics Letters
Publication Type :
Academic Journal
Accession number :
156622685
Full Text :
https://doi.org/10.1063/5.0087379