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Micro-Raman Study of Charge Carrier Distribution and Cathodoluminescence Microanalysis of Porous gap Membranes

Published online by Cambridge University Press:  10 February 2011

I. M. Tiginyanu ,
M. A. Stevens Kalceff ,
A. Sarua ,
G. Irmer ,
J. Monecke ,
O. Cojocari  and
H. L. Hartnagel
I. M. Tiginyanu
Affiliation:
Technical University of Moldova, MD-2004 Chisinau, Moldova, [email protected]
M. A. Stevens Kalceff
Affiliation:
Microstructural Analysis Unit, University of Technology, Sydney, Australia
A. Sarua
Affiliation:
TU Bergakademie Freiberg, D-09596 Freiberg, Germany
G. Irmer
Affiliation:
TU Bergakademie Freiberg, D-09596 Freiberg, Germany
J. Monecke
Affiliation:
TU Bergakademie Freiberg, D-09596 Freiberg, Germany
O. Cojocari
Affiliation:
Technical University of Moldova, MD-2004 Chisinau, Moldova, [email protected]
H. L. Hartnagel
Affiliation:
Technische Universittit Darmstadt, D-64283 Darmstadt, Germany
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Abstract

Porous layers and free-standing membranes were fabricated by anodic etching of n-GaP substrates in a sulphuric acid solution. Micro-Raman analysis of the interaction between the longitudinal optical phonons and plasmons in porous membranes allowed us to obtain specific information about the electro-optical properties of microstructured GaP. In particular, apart from the carrier exhausted areas surrounding the pores, the existence of conductive regions was demonstrated. A comparative analysis of the secondary electron and panchromatic cathodoluminescence (CL) images evidenced an increase in the emission efficiency caused by porosity. Data concerning the spectral distribution of CL in bulk and porous samples are presented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 588: Symposium P – Optical Microstructural Characterization of Semiconductors , 1999 , 161
Copyright
Copyright © Materials Research Society 2000

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