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An Electron Paramagnetic Resonance and Photoelectron Spectroscopy Study on the Native Oxidation of CuGaSe2

Published online by Cambridge University Press:  01 February 2011

R. Würz ,
A. Meeder ,
D. Fuertes Marrón ,
Th. Schedel-Niedrig  and
K. Lips
R. Würz
Affiliation:
Institut für Physikalische Elektronik, Pfaffenwaldring 47, D-70569 Stuttgart, Germany
A. Meeder
Affiliation:
Hahn-Meitner-Institut, Abteilung SE2, Glienicker Strasse 100, D-14109 Berlin, Germany
D. Fuertes Marrón
Affiliation:
Hahn-Meitner-Institut, Abteilung SE2, Glienicker Strasse 100, D-14109 Berlin, Germany
Th. Schedel-Niedrig
Affiliation:
Hahn-Meitner-Institut, Abteilung SE2, Glienicker Strasse 100, D-14109 Berlin, Germany
K. Lips
Affiliation:
Hahn-Meitner-Institut, Abteilung SE1, Kekuléstrasse 5, D-12489 Berlin, Germany
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Abstract

The complementary techniques of electron paramagnetic resonance (EPR) and photoelectron spectroscopy (PES) have been used to study the native oxidation of CuGaSe2 crystals and polycrystalline thin films. After storage of specimen under ambient conditions for few months, an EPR signal occurred which is assigned to Cu2+ and is found independently from the sample morphology. This signal is due to the formation of a copper hydroxide surface phase, Cu(OH)2, observed only after long term oxidation. Chemical etching in KCN removes and thermal reduction by annealing in vacuum at 200°C reduces this Cu(OH)2 surface phase as proved by EPR and PES. Implications for solar cell device performance will be discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 865: Symposium F – Thin-Film Compound Semiconductor Photovoltaics , 2005 , F5.36
Copyright
Copyright © Materials Research Society 2005

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