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Proceedings Paper

Characterization of Si delta-doped GaAs using photoellipsometry and photoreflectance
Author(s): Maho Mochizuki; Kenichiro Kobayashi; Hiroyuki Yaguchi; Tadashi Saitoh; Yi-Ming Xiong
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Paper Abstract

Photoellipsometry (PE), a contactless optical method, combines the features of both spectroscopic ellipsometry and photoreflectance (PR) and offers more complete information about the sample from a single experiment. PR, on the other hand, has been widely used for characterizing semiconductor microstructures. The nondestructive nature and the relatively sharper features produced in the measured spectra make this method very attractive. It was based on these advantages that we applied PE and PR to Si (delta) -doped GaAs. Two Si (delta) -doped GaAs samples were investigated in this study, each having an undoped GaAs cap layer of thickness (L equals 100 and 200 nm, respectively). Our main objective was to determine built-in electric field strength in the cap layer of each sample. In the analysis of the measured PE spectra, the Franz-Keldysh (FK) theory was used, taking into account the broadening and the photovoltage effects, whereas the measured PR spectra were analyzed using the asymptotic form of an Airy function for the FK oscillations. The results of our analysis show that, for each sample studied, the field strength obtained from PE spectra is in good agreement with that determined from PR spectra, and that the field strength decreases with the increase of the cap layer thickness.

Paper Details

Date Published: 16 August 1996
PDF: 4 pages
Proc. SPIE 2873, International Symposium on Polarization Analysis and Applications to Device Technology, (16 August 1996); doi: 10.1117/12.246238
Show Author Affiliations
Maho Mochizuki, Tokyo Univ. of Agriculture and Technology (Japan)
Kenichiro Kobayashi, Tokyo Univ. of Agriculture and Technology (Japan)
Hiroyuki Yaguchi, Univ. of Tokyo (Japan)
Tadashi Saitoh, Tokyo Univ. of Agriculture and Technology (Japan)
Yi-Ming Xiong, Tokyo Univ. of Agriculture and Technology (Japan)

Published in SPIE Proceedings Vol. 2873:
International Symposium on Polarization Analysis and Applications to Device Technology
Toru Yoshizawa; Hideshi Yokota, Editor(s)

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