Bias-dependent non-Gaussian dark current noise has been observed in p -type quantum-well infrared photodetectors. Time domain analysis of the noise revealed two-level telegraphlike fluctuations with exponentially distributed lifetimes that change dramatically with changing bias. The nature of the non-Gaussian fluctuations at intermediate voltages is ascribed to switching between two electric-field distributions corresponding to distinct tunneling probabilities out of the quantum wells. The finite transition time between the levels is identified with the recharging time.
|Number of pages||3|
|Journal||Applied Physics Letters|
|State||Published - 12 Dec 2005|
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)