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Short-wavelength-infrared (SWIR; 1.4–3.0 µm) photodetection is important for various applications. Inducing a low-cost silicon-compatible material, such as germanium, to detect SWIR light would be advantageous for SWIR applications compared with using conventional (III-V or II-VI) SWIR materials. Here, we present a scalable nonequilibrium method for hyperdoping germanium with gold for dopant-mediated SWIR photodetection. Using ion implantation followed by nanosecond pulsed laser melting, we obtain a single-crystal material with a peak gold concentration of 3× 10 19 cm− 3 (10 3 times the solubility limit). This hyperdoped germanium has fundamentally different optoelectronic properties from those of intrinsic and conventionally doped germanium. This material exhibits sub-band-gap absorption of light up to wavelengths of at least 3 µm, with a sub-band-gap optical absorption coefficient comparable to that …
American Physical Society
Publication date: 
16 Dec 2020

Hemi H Gandhi, David Pastor, Tuan T Tran, S Kalchmair, LA Smilie, Jonathan P Mailoa, Ruggero Milazzo, Enrico Napolitani, Marco Loncar, James S Williams, Michael J Aziz, Eric Mazur

Biblio References: 
Volume: 14 Issue: 6 Pages: 064051
Physical Review Applied