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The Effects of Interfacial Reactions in the Formation of Ohmic Contacts to GaAs

Published online by Cambridge University Press:  25 February 2011

Verlyn Fischer ,
P.E. Viljoen ,
E. Ristolainen ,
P.H. Holloway ,
W.V. Lampert ,
T.W. Haas  and
J.M. Woodall
Verlyn Fischer
Affiliation:
Dept. of Materials Science and Engineering, University of Florida, Gainesville, FL 32611;
P.E. Viljoen
Affiliation:
Dept. of Materials Science and Engineering, University of Florida, Gainesville, FL 32611; Permanent Address: Dept. of Physics, University of the Orange Free State, Bloemfontein, Republic of South Africa;
E. Ristolainen
Affiliation:
Dept. of Materials Science and Engineering, University of Florida, Gainesville, FL 32611; Permanent Address: Center for Chemical Analysis, Helsinki University of Technology, Helsinki, Finland;
P.H. Holloway
Affiliation:
Dept. of Materials Science and Engineering, University of Florida, Gainesville, FL 32611;
W.V. Lampert
Affiliation:
Materials Directorate, Wright Laboratory, Wright Patterson Air Force Base, OH 45433-6533;
T.W. Haas
Affiliation:
Materials Directorate, Wright Laboratory, Wright Patterson Air Force Base, OH 45433-6533;
J.M. Woodall
Affiliation:
Dept. of Electrical Engineering, Purdue University, West Lafayette, IN 47907
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Abstract

The effect of heat treatments between 400°C and 500°C on electrical contacts of In, Ga, Pb, and AU to n- or p-GaAs, and Ni to n-GaAs have been studied using current-voltage (I-V), Auger electron spectroscopy and scanning electron microscopy. Ohmic contacts were formed between In and GaAs upon heating due to formation of an InGaAs surface layer with low interfacial transport barriers. The contacts between Ga or Pb and n- and p-GaAs remained rectifying due to a lack of interfacial reaction. Films of Au reacted with both n-and p-type GaAs resulting in rectangular "pits". This led to ohmic contacts only on n-type substrates due to segregation of the Si dopants to the surface of the decomposed GaAs "pits". Dopant segregation did not occur when Au reacted with p-GaAs or Ni reacted with n-GaAs, thus these contacts remained rectifying at lower doping densities (4 x 1017 cm-3).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 337: Symposium B – Advanced Metallization for Devices and Circuits—Science, Technology and Manufacturing III , 1994 , 413
Copyright
Copyright © Materials Research Society 1994

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References

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