Journal
APPLIED PHYSICS LETTERS
Volume 98, Issue 10, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3561777
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Funding
- China's National 973 Research Programme [2010CB327602]
- Natural Science Fund for Innovative Research Group [61021003]
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We report a two-color quantum dot infrared photodetector (QDIP) using double tunneling barriers (DTBs) on one side of the InGaAs/AlGaAs dots. The two-color detection is achieved by changing the polarity of the applied bias voltages. In contrast, the same QDIP structure without the DTBs does not exhibit this detection wavelength tunability by switching the bias polarity. The two-color detection is ascribed to a different escape mechanism of electrons between positive and negative biases. The electrons escape out of the quantum well through resonant tunneling for a positive bias voltage while tunnel through a triangular barrier for a negative bias voltage. (C) 2011 American Institute of Physics. [doi:10.1063/1.3561777]
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