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 language | English |
|---|---|
| Pages (from-to) | 155-157 |
| Number of pages | 3 |
| Journal | Superlattices and Microstructures |
| Volume | 8 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 1990 |
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ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Electrical and Electronic Engineering
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Photoreflectance study of the internal electric fields at the n-type GaAs surface and across the n-type GaAs/substrate interface. / Lu, C. R.; Anderson, J. R.; Stone, D. R.; Beard, W. T.; Wilson, R. A.
In: Superlattices and Microstructures, Vol. 8, No. 2, 1990, p. 155-157.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Photoreflectance study of the internal electric fields at the n-type GaAs surface and across the n-type GaAs/substrate interface
AU - Lu, C. R.
AU - Anderson, J. R.
AU - Stone, D. R.
AU - Beard, W. T.
AU - Wilson, R. A.
PY - 1990
Y1 - 1990
N2 - 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.
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.
UR - http://www.scopus.com/inward/record.url?scp=5844245881&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=5844245881&partnerID=8YFLogxK
U2 - 10.1016/0749-6036(90)90081-H
DO - 10.1016/0749-6036(90)90081-H
M3 - Article
AN - SCOPUS:5844245881
VL - 8
SP - 155
EP - 157
JO - Superlattices and Microstructures
JF - Superlattices and Microstructures
SN - 0749-6036
IS - 2
ER -