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journal article·2020-07-01Open access

Chalcogen-hyperdoped germanium for short-wavelength infrared photodetection

Hemi H. Gandhi, David Pastor, Tuan T. Tran, Stefan Kalchmair, Lachlan A. Smillie, Jonathan P. Mailoa, Ruggero Milazzo, Enrico Napolitani, Marko Loncar, James S. Williams, Michael J. Aziz, Eric Mazur

AIP Advances· Volume 10· Issue 7
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Source abstract

Abstract

Obtaining short-wavelength-infrared (SWIR; 1.4 μm–3.0 μm) room-temperature photodetection in a low-cost, group IV semiconductor is desirable for numerous applications. We demonstrate a non-equilibrium method for hyperdoping germanium with selenium or tellurium for dopant-mediated SWIR photodetection. By ion-implanting Se or Te into Ge wafers and restoring crystallinity with pulsed laser melting induced rapid solidification, we obtain single crystalline materials with peak Se and Te concentrations of 1020 cm−3 (104 times the solubility limits). These hyperdoped materials exhibit sub-bandgap absorption of light up to wavelengths of at least 3.0 μm, with their sub-bandgap optical absorption coefficients comparable to those of commercial SWIR photodetection materials. Although previous studies of Ge-based photodetectors have reported a sub-bandgap optoelectronic response only at low temperature, we report room-temperature sub-bandgap SWIR photodetection at wavelengths as long as 3.0 μm from rudimentary hyperdoped Ge:Se and Ge:Te photodetectors.
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Research context

BiomaterialsElectronic materials

OpenAlex topics: Photonic and Optical Devices · Silicon Nanostructures and Photoluminescence · Thin-Film Transistor Technologies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Harvard John A. Paulson School of Engineering and Applied Sciences 1 , Cambridge, Massachusetts 02138, USA

Departamento de Estructura de la Materia, Física térmica y Electrónica, Facultad de Ciencias Físicas 2 , 28040 Madrid, Spain

Department of Electronic Materials Engineering, Research School of Physics and Engineering, Australian National University 3 , Canberra, ACT 0200, Australia

Department of Physics and Astronomy, Ångström Laboratory, Uppsala University 4 , P.O. Box 516, SE-751 20 Uppsala, Sweden

Robert Bosch LLC 5 , Cambridge, Massachusetts 02138, USA

Dipartimento di Fisica e Astronomia, Università di Padova and CNR-IMM 6 , Via Marzolo 8, I-35131 Padova, Italy

Funding

Harvard University Committee on General Scholarships · Directed Energy Processing Society Graduate Fellowship Fund · Programa Nacional de Movilidad de Recursos Humanos del Plan Nacional · Program Ramón y Cajal · Spanish Ministry of Science, Innovation and Universities · National Science Foundation · Air Force Office of Scientific Research · U.S. Department of Defense

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