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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    Titel :

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


    Beteiligte:
    Hwang, S.H. (Autor:in) / Shin, J.C. (Autor:in) / Choi, W.J. (Autor:in) / Han, I.K. (Autor:in) / Lee, J.I. (Autor:in) / Choi, J.W. (Autor:in) / Han, H. (Autor:in)


    Erscheinungsdatum :

    2003-01-01


    Format / Umfang :

    57526 byte




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch







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