Comparison of Single Well and Double and Triple Coupled Well Quantum-Well Infrared Photodetector Designs
ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
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A comparison is presented between three GaAsAlGaAs quantum well infrared photodetector QWIP designs the conventional single well and two coupled well designs, one containing two wells per period and the other three. Three QWIP detector test arrays have the same quantum well width, barrier thickness, doping density in each well, and a peak wavelength of 8.7 m. The detector array test structures used edge coupling to remove the grating or optical coupling structure effects from the detector response characteristics. Extensive temperature, bias and spectral dependent blackbody response and specific detectivity data are presented. The data show that coupled well designs offer both higher quantum efficiency and lower dark current than the more conventional single well QWIP.
- Infrared Detection and Detectors