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- W1512740204 abstract "Modulation spectroscopic techniques, which are sensitive to the optical properties of solids [1], are the most useful method for the analysis of epitaxial layers for compound semiconductor devices. Photoreflectance (PR) spectroscopy can be a non-destructive and contact-less inspection technique because of the optical modulation of the built-in electric field by modulated photo excitation. As a consequence of the great advantage, PR technique has been applied for the characterization of various semiconductor heterostructure devices [2]. In the presence of surface or interface electric fields, the PR spectrum exhibits oscillations in the vicinity of the optical transition energies at critical points, so-called Franz-Keldysh (FK) oscillations [1]. By analyzing the period of the FK oscillations, we can evaluate the electric field strength at the corresponding space charge regions of the surface or the interface. In the analysis of the electric field strength, we usually plot the positions of the extrema of the FK oscillations from the critical point energy according to the following equation that is derived from the asymptotic form of an electro-optic function [3]:" @default.
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- W1512740204 date "2003-10-01" @default.
- W1512740204 modified "2023-09-23" @default.
- W1512740204 title "Analysis of a Phase Factor of Franz-Keldysh Oscillations in GaAs/AlGaAs Heterostructures" @default.
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