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Conference Paper
Interference Effects on the Photoreflectance of Modulation-doped AlGaAs/GaAs Single Heterojunctions
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- Authors
- Kyu Seok Lee, J. O. Kim, S. J. Lee, S. K. Noh
- Issue Date
- 2006-02
- Citation
- 한국반도체 학술 대회 (KCS) 2006, pp.1-2
- Publisher
- 대한전기학회
- Language
- English
- Type
- Conference Paper
- Abstract
- We present on oscillations in the photoreflectance (PR) spectra of modulation-doped AlGaAs/GaAs single heterojunctions (SHs) grown on semi-insulating (SI) GaAs substrates. The oscillatory feature occurs in the energy range around the bandgap of GaAs. Undoped bulk GaAs samples grown on SI-GaAs substrates do not show such oscillations, indicating that the oscillations are related to the two dimensional electron gas (2DEG) at the AlGaAs/GaAs interface. The oscillations in the PR spectra of the modulation-doped AlGaAs/GaAs SHs are attributed to the interference effect of two light beams, one reflected from the 2DEG channel and the other reflected from the GaAs/SI-GaAs interface.
- KSP Keywords
- 2DEG channel, GaAs substrate, Interference effect, Light beams, Modulation-doped(MD), SI-GaAs, Semi-Insulating, Two-dimensional electron gas(2DEG), bulk GaAs, two-dimensional(2D)