Low dark current quantum-dot infrared photodetectors with an AlGaAs current blocking layer

Wang, S. Y.; Lin, S. D.; Wu, H. W.; Lee, C. P.
February 2001
Applied Physics Letters;2/19/2001, Vol. 78 Issue 8, p1023
Academic Journal
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 2.5x10[sup 9] cm Hz[sup 1/2]/W[sup 1/2], which is the highest detectivity reported for a QDIP at 77 K. © 2001 American Institute of Physics.


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