Low dark current quantum-dot infrared photodetectors with an AlGaAs current blocking layer
Authors:
- 19 February 2001
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 78 (8) , 1023-1025
Abstract
Low dark current InAs/GaAs quantum-dot infrared photodetectors (QDIPs) are demonstrated. The dark current is reduced by over three orders of magnitude by using a thin AlGaAs current blocking layer. This thin AlGaAs layer reduces the dark current much more than the response signal. The responsivity at 0.5 V is 0.08 A/W with a peak detection wavelength at 6.5μm. The corresponding detectivity is 2.5×109 cm Hz1/2/W1/2, which is the highest detectivity reported for a QDIP at 77 K.Keywords
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