Abstract
We report on our study of the role of the Pauli exclusion principle in the generation of photocurrent in quantum dot infrared photodetectors. The properties of photodetectors are determined by the balance between relaxation and photogeneration rates. Due to the Pauli principle, the relaxation rate depends on the number of available states in the quantum dots. This dependence is strong for small quantum dots with few levels in each dot and weak for large quantum dots or quantum wells. We study both the $I\text{\ensuremath{-}}V$ characteristics of the system and low-frequency current noise. In $I\text{\ensuremath{-}}V$ dependence, the Pauli principle enhances the photocurrent at a given bias voltage. The current noise has more complicated dependence. At low bias voltage, the Pauli principle enhances the noise, while at high voltage, the exclusion principle suppresses the noise of the current. With increasing intensity of illumination, the effects of the Pauli principle are suppressed due to depletion of the dot levels.
Published Version
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