Characteristics of a tunneling quantum-dot infrared photodetector operating at room temperature

We report high-temperature ( 240 - 300 K ) operation of a tunneling quantum-dot infrared photodetector. The device displays two-color characteristics with photoresponse peaks at ∼ 6 μ m and 17 μ m . The extremely low dark current density of 1.55 A ∕ cm 2 at 300 K for 1 V bias is made possible by the...

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Bibliographic Details
Published in:Applied physics letters 2005-05, Vol.86 (19), p.191106-191106-3
Main Authors: Bhattacharya, P., Su, X. H., Chakrabarti, S., Ariyawansa, G., Perera, A. G. U.
Format: Article
Language:English
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Summary:We report high-temperature ( 240 - 300 K ) operation of a tunneling quantum-dot infrared photodetector. The device displays two-color characteristics with photoresponse peaks at ∼ 6 μ m and 17 μ m . The extremely low dark current density of 1.55 A ∕ cm 2 at 300 K for 1 V bias is made possible by the tunnel filter. For the 17 μ m absorption, the measured peak responsivity is 0.16 A ∕ W ( 300 K ) for a bias of 2 V and the specific detectivity D * is 1.5 × 10 7 cm Hz 1 ∕ 2 ∕ W ( 280 K ) for a bias of 1 V . Excellent performance characteristics are also measured for the 6 μ m photoresponse.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1923766