VOLTAGE-TUNING IN MULTICOLOR QUANTUM-WELL INFRARED PHOTODETECTOR STACKS

A systematic study of stacked quantum well infrared photodetectors is undertaken to improve the understanding of the voltage-tunable multi-c olor spectral response. The multi-color capability is achieved by sequ entially growing conventional one color detectors, separated by conduc ting layers. The behavior of the stacked devices is proven to correspo nd to the individual detectors simply acting in series with each other . The de resistance, photocurrent and dynamic resistance characteristi cs of the individual detectors are examined and correlated with the vo ltage-tuning in the stack. (C) 1996 American Institute of Physics.