Detection wavelength and device performance tuning of InAs QDIPs with thin AlGaAs layers

QDIPs with thin inserted AlGaAs layers adjacent to the QDs were investigated for the tailoring of detection wavelength and device performance. Simple InAs/GaAs QDIPs and DWELL QDIPs with different insertion layer structure were studied. The thin AlGaAs layer is shown to effectively modify the electr...

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Bibliographic Details
Published in:Infrared physics & technology 2009-11, Vol.52 (6), p.264-267
Main Authors: Wang, S.Y., Ling, H.S., Lo, M.C., Lee, C.P.
Format: Article
Language:English
Subjects:
Applied sciences
Bolometer
infrared, submillimeter wave, microwave and radiowave receivers and detectors
Communication, education, history, and philosophy
Electronics
Exact sciences and technology
Infrared detector
Infrared, submillimeter wave, microwave and radiowave instruments, equipment and techniques
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Intersubband
Optoelectronic devices
Physics
Physics literature and publications
Quantum dot
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
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Summary:QDIPs with thin inserted AlGaAs layers adjacent to the QDs were investigated for the tailoring of detection wavelength and device performance. Simple InAs/GaAs QDIPs and DWELL QDIPs with different insertion layer structure were studied. The thin AlGaAs layer is shown to effectively modify the electron wavefunction and associated confined state energies which lead to the change of the detection wavelength and the polarization dependent quantum efficiency. Furthermore, the dark current and conductive gain also change with different device structures. The insertion of AlGaAs layers provides an additional freedom of tuning the electronics states involved in the infrared detection and also enables the improvement of the absorption and device performance.
ISSN:1350-4495
1879-0275
DOI:10.1016/j.infrared.2009.05.033