Abstract
A self-consistent ensemble Monte Carlo simulation is used to study ultrafast electron transport in quantum well infrared photodetectors (QWIPs). It is shown that transient photocurrent triggered by a short infrared radiation pulse reveals a sharp peak followed by a relatively slow decay. The photocurrent peak is associated with the electron velocity overshoot effect while the slow component of the photocurrent is determined by the electron transit time and capture effects. The velocity overshoot effect results in the existence of a plateau in the QWIP frequency-dependent responsivity in the range of terahertz frequencies.
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