Interface charge polarity of a polar on nonpolar semiconductor GaAs/Si with Ga and As prelayers
作者:
T. Won,
G. Munns,
R. Houdre´,
H. Morkoc¸,
期刊:
Applied Physics Letters
(AIP Available online 1986)
卷期:
Volume 49,
issue 19
页码: 1257-1259
ISSN:0003-6951
年代: 1986
DOI:10.1063/1.97379
出版商: AIP
数据来源: AIP
摘要:
We have studied the electrical characteristics ofp‐GaAs/n‐Si (100) heterojunction diodes grown by molecular beam epitaxy in an effort to determine the interface polarity. A Ga or As pre‐exposure was used prior to the growth ofp‐GaAs onn‐Si substrates to prevent antiphase domains. The Ga prelayer induces a shift in the built‐in voltage of −0.2 V, while the As prelayer shifts it as much as +2.0 V depending upon the As coverage. From the shift, the electrical charge and its polarity can be determined which is not possible by structural analysis. These electrical measurements are very sensitive to the interface charge properties and show very clearly that even with a submonolayer pre‐exposure, antiphase domain‐free material can be obtained.
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