Faculté des sciences

16.5 µm quantum cascade detector using miniband transport

Giorgetta, Fabrizio R. ; Baumann, Esther ; Graf, Marcel ; Ajili, Lassaad ; Hoyler, Nicolas ; Marcella Giovannini ; Faist, Jérôme ; Hofstetter, Daniel ; Krötz, Peter ; Sonnabend, Guido

In: Applied Physics Letters, 2007, vol. 90, no. 231111, p. 1-3

The authors report on an InP based photovoltaic quantum cascade detector operating at 16.5 µm and using miniband-based vertical transport. This concept allowed the construction of a longitudinal optical phonon extraction stair with two rungs without touching on a high device resistance. At 10 K, they observed a responsivity of 1.72 mA/W and a Johnson noise limited detectivity of 2.2×109... Plus

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    Summary
    The authors report on an InP based photovoltaic quantum cascade detector operating at 16.5 µm and using miniband-based vertical transport. This concept allowed the construction of a longitudinal optical phonon extraction stair with two rungs without touching on a high device resistance. At 10 K, they observed a responsivity of 1.72 mA/W and a Johnson noise limited detectivity of 2.2×109 Jones. Altogether, this design resulted in detection at temperatures of up to 90 K with a lower bandwidth limit of 200 MHz imposed by the measurement setup.