Detection wavelength tuning of quantum well infrared photodetector (QWIP) has been carried out by using impurity free vacancy disordering (IFVD) technique with SiO/sub 2/ capping layer. The detection wavelength of QWIP was changed from 8.2/spl mu/m to 10/spl mu/m due to bandgap change by intermixing of constituent atoms in multiple quantum well (MQW) absorption region in Fig.1. The red-shift in detection wavelength can be explained by gap narrowing between confined state and continuum state in conduction band, which is a consequence of blue-shift in MQW bandgap after intermixing in Fig.2. The bandgap of the intermixed MQW structure was theoretically investigated. The Al-Ga inter-diffusion, which induces the red-shift of detection wavelength from 8.2/spl mu/m to 10/spl mu/m, was calculated to be 7/spl Aring/ at 850/spl deg/C.


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    Title :

    Experimental and theoretical investigation of detection wavelength tuning in quantum well infrared-photodetectors by quantum well intermixing technique


    Contributors:
    Hwang, S.H. (author) / Shin, J.C. (author) / Choi, W.J. (author) / Han, I.K. (author) / Lee, J.I. (author) / Choi, J.W. (author) / Han, H. (author)


    Publication date :

    2003-01-01


    Size :

    57526 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English






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