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Contactless Electroreflectance Study of InxGa1-xAs/InP Multiple Quantum Well Structures Including the Observation of Surface/Interface Electric Fields

Published online by Cambridge University Press:  03 September 2012

L.V. Malikova ,
J.Z. Wan ,
Fred H. Pollak ,
J.G. Simmons  and
D.A. Thompson
L.V. Malikova
Affiliation:
Physics Department and New York State Center for Advanced Technology in Ultrafast Photonic Materials and Applications, Brooklyn College of the City University of New York, Brooklyn, New York 11210, USA.
J.Z. Wan
Affiliation:
Physics Department and New York State Center for Advanced Technology in Ultrafast Photonic Materials and Applications, Brooklyn College of the City University of New York, Brooklyn, New York 11210, USA.
Fred H. Pollak
Affiliation:
Physics Department and New York State Center for Advanced Technology in Ultrafast Photonic Materials and Applications, Brooklyn College of the City University of New York, Brooklyn, New York 11210, USA.
J.G. Simmons
Affiliation:
Center for Electrophotonic Materials and Devices (CEMD), McMaster University, Hamilton, Ontario, L8S 4L7, Canada.
D.A. Thompson
Affiliation:
Center for Electrophotonic Materials and Devices (CEMD), McMaster University, Hamilton, Ontario, L8S 4L7, Canada.
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Abstract

Contactless electroreflectance measurements at 300 K were performed on two InxGal-xAs/InP ]x = 0.53 (lattice-matched) and 0.75] samples containing three quantum wells (QWs) grown by gas-source molecular beam epitaxy. The spectra consisted of two excitonic transitions (le-l hh and le-l lh), corresponding to the fundamental conduction to heavy (h)- and light(l)- hole transitions, respectively, in the QW portion and a complicated Franz-Keldysh oscillation (FKO) pattern originating in the InP regions. Comparison between the experimental energies of le-l hh/le-llh and a theoretical envelope function calculation (including the effect of strain) made it possible to evaluate the conduction band offset parameters Qc =0.34+0.03 and 0.57+0.03 for x = 0.53 and 0.75, respectively. The InP related FKO beat patterns were analyzed by a Fourier transform method. It was found that the FKO spectra were due to the simultaneous contribution of at least three different fields (106 kV/cm, 36 kV/cm, and 23 kV/cm), which originate in the various interfaces, i.e., substrate/buffer, cap layer/surface, and buffer/QW structure. Identification of the different fields has been accomplished by comparison of the Fourier-transformed spectra before and after sulfur passivation of the structure surface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 448: Symposium M – Control of Semiconductor Surfaces and Interfaces , 1996 , 481
Copyright
Copyright © Materials Research Society 1997

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