Regensburg 2019 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 12: HL Poster I
HL 12.66: Poster
Montag, 1. April 2019, 17:30–20:00, Poster E
Temperature-robust terahertz quantum cascade lasers using Ge/SiGe — Thomas Grange1, •Stefan Birner1, Giacomo Scalari2, Giovanni Capellini3, Douglas Paul4, Monica De Seta5, and Michele Virgilio6 — 1nextnano GmbH, 85748 Garching b. München, Germany — 2Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland — 3IHP GmbH, 15236 Frankfurt (Oder), Germany — 4School of Engineering, University of Glasgow, G12 8LT Glasgow, UK — 5Dipartimento di Scienze, Università di Roma Tre, 00146 Roma, Italy — 6Dipartimento di Fisica ``E. Fermi'' Università di Pisa, 56127 Pisa, Italy
In the past 15 years, terahertz (THz) quantum cascade lasers have been developed using III-V materials. High output power has been demonstrated but the maximum temperature operation reported remains limited to 200 K. To achieve higher temperature operation, group IV semiconductors, thanks to their non-polar lattice, offer an interesting alternative. Nevertheless, group IV QCLs have not been demonstrated yet. Furthermore, an accurate theoretical prediction of their performance, in comparison with III-V systems is still lacking. In this work, we theoretically investigate transport and gain in n-type Ge/SiGe THz QCLs that leverage on L valley electrons using a nonequilibrium Green's functions (NEGF) model. The calculated maximum operation temperature in the Ge/SiGe QCL is found above room temperature. This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No. 766719 - FLASH project.