A 5.7 THz GaN/AlGaN quantum cascade detector based on polar step quantum wells

Creators: Quach, P.; Jollivet, A.; Babichev, A.; Isac, N.; Morassi, M.; Lemaitre, Aristide; Yunin, P; Frayssinet, E.; de Mierry, P.; Jeannin, M.; Bousseksou, A.; Colombelli, R.; Tchernycheva, M.; Cordier, Y.; Julien, F

Others:: Centre de Nanosciences et de Nanotechnologies (C2N) ; Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS); ITMO University [Russia]; Saint Petersburg Electrotechnical University "LETI"; Institute for Physics of Microstructures of the RAS ; Russian Academy of Sciences [Moscow] (RAS); Centre de recherche sur l'hétéroepitaxie et ses applications (CRHEA) ; Université Nice Sophia Antipolis (1965 - 2019) (UNS) ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)

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We report on a GaN/AlGaN quantum cascade detector operating in the terahertz spectral range. The device was grown by metal organic chemical vapor deposition on a c-sapphire substrate and relies on polar GaN/AlGaN step quantum wells. The active region thickness is in micrometer range. The structural, electrical, and optical investigations attest of high structural quality of the synthetized nitride material. The detector exhibits a peak photocurrent at 5.7 THz (23.6 meV) with a responsivity of 0.1 mA/W at 10 K under surface normal irradiation through a 10 μm period grating. The photocurrent persists up to 20 K.

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A 5.7 THz GaN/AlGaN quantum cascade detector based on polar step quantum wells

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