Photoreflectance study of the internal electric fields at the n-type GaAs surface and across the n-type GaAs/substrate interface

Chien-Rong Lu, J. R. Anderson, D. R. Stone, W. T. Beard, R. A. Wilson

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Photoreflectance (PR) experiments have been performed from 4.2 K to 300 K to study the temperature dependence of the internal electric fields in MBE grown n-type GaAs with various doping profiles. Franz-Keldysh oscillations (FKO) were observed in the PR spectra from thick (3μm) Si-doped samples at all temperatures. The peak separation of the FKO, and thus the internal electric field, increased with increasing temperature. In thin samples (< 1μm) with an undoped protection cap (< 0.5μm), two sets of FKO were observed. The one with large oscillation period originated from the modulation of the internal electric field in the cap region and the one with small period was due to the modulation of the internal electric field near the thin film/substrate interface. The internal electric fields were deduced from the peak separations of the FKO. The temperature dependence of the internal electric field in the space-charge regions, deduced from the FKO, agreed with the calculated results.

Original languageEnglish
Pages (from-to)155-157
Number of pages3
JournalSuperlattices and Microstructures
Volume8
Issue number2
DOIs
Publication statusPublished - 1990 Jan 1

Fingerprint

Electric fields
oscillations
electric fields
Substrates
caps
Modulation
modulation
Temperature
temperature dependence
Electric space charge
Molecular beam epitaxy
gallium arsenide
space charge
Doping (additives)
Thin films
temperature
thin films
profiles
Experiments

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Photoreflectance study of the internal electric fields at the n-type GaAs surface and across the n-type GaAs/substrate interface. / Lu, Chien-Rong; Anderson, J. R.; Stone, D. R.; Beard, W. T.; Wilson, R. A.

In: Superlattices and Microstructures, Vol. 8, No. 2, 01.01.1990, p. 155-157.

Research output: Contribution to journalArticle

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AB - Photoreflectance (PR) experiments have been performed from 4.2 K to 300 K to study the temperature dependence of the internal electric fields in MBE grown n-type GaAs with various doping profiles. Franz-Keldysh oscillations (FKO) were observed in the PR spectra from thick (3μm) Si-doped samples at all temperatures. The peak separation of the FKO, and thus the internal electric field, increased with increasing temperature. In thin samples (< 1μm) with an undoped protection cap (< 0.5μm), two sets of FKO were observed. The one with large oscillation period originated from the modulation of the internal electric field in the cap region and the one with small period was due to the modulation of the internal electric field near the thin film/substrate interface. The internal electric fields were deduced from the peak separations of the FKO. The temperature dependence of the internal electric field in the space-charge regions, deduced from the FKO, agreed with the calculated results.

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