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[Author] Hideo TAKEUCHI(1hit)

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  • Analysis of a Phase Factor of Franz-Keldysh Oscillations in GaAs/AlGaAs Heterostructures

    Hideo TAKEUCHI  Yoshitsugu YAMAMOTO  Ryo HATTORI  Takahide ISHIKAWA  Masaaki NAKAYAMA  

     
    PAPER

      Vol:
    E86-C No:10
      Page(s):
    2015-2021

    We propose an analysis method for Franz-Keldysh (FK) oscillations appearing in photoreflectance (PR) spectra of heterojunction device structures, which enables precise and simultaneous evaluation of the built-in electric field strength and band-gap energy. Samples for PR measurements were n+-GaAs/n-Al0.3 Ga0.7 As/i-GaAs heterostructures with different Al0.3Ga0.7As-layer thickness. We have found that the phase of the FK oscillations originating from the i-GaAs buffer layer depends on the Al0.3 Ga0.7 As-layer thickness. We have derived a calculation model for FK oscillations that includes the interference of probe light. From the comparison of the calculated spectra with the measured spectra, we conclude that mixing of the real and imaginary parts of a modulated dielectric function, which is caused by the probe-light interference, gives rise to the phase shift of the FK oscillations. Our FK-oscillation analysis method reduces ambiguity in the estimation of band-gap energy that is considerable in a conventional analysis.