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Photocurrent spectroscopy of site-controlled pyramidal quantum dots

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7 Author(s)
Mohan, A. ; Institute for Quantum Electronics, Wolfgang-Pauli-Strasse 16, ETH Zürich, 8093 Zürich, Switzerland ; Nevou, L. ; Gallo, P. ; Dwir, B.
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Intraband photocurrent spectroscopy of site-controlled pyramidal quantum dots by inserting them into the intrinsic region of n-i-n like quantum dot infrared photodetector structure is reported. The photovoltaic response is observed in the mid-infrared region. A peak responsivity of 0.4 mA/W at 120 meV (λ = 10 μm) is observed at 10 K at -2 V bias. The ability to engineer states in the conduction band of the QDs has been exploited to tune their photocurrent response from 10 μm to 18 μm with a narrow spectral width of Δλ/λ = 0.17.

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Applied Physics Letters  (Volume:101 ,  Issue: 3 )