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Evidence of the Meyer-Neldel Rule in InGaAsN Alloys: Consequences for Photovoltaic Materials

Published online by Cambridge University Press:  01 February 2011

Steven W. Johnston  and
Richard S. Crandall
Steven W. Johnston
Affiliation:
National Renewable Energy Laboratory Golden, CO80401, U.S.A.
Richard S. Crandall
Affiliation:
National Renewable Energy Laboratory Golden, CO80401, U.S.A.
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Abstract

We present data showing the potential adverse effects on photovoltaic device performance of all traps in InGaAsN. Deep-level transient spectroscopy measurements were performed on InGaAsN samples grown by both metal-organic chemical vapor deposition and RF plasma-assisted molecular-beam epitaxy. For each growth technique, we studied samples with varying nitrogen composition ranging from 0% to 2.2%. A deep hole trap with activation energy ranging between 0.5 and 0.8 eV is observed in all samples. These data clearly obey the Meyer-Neldel rule, which states that all traps have the same emission rate at the isokinetic temperature. A fit of our trap data gives an isokinetic temperature of 350 K. We find that the emission time for all deep hole traps is on the order of milliseconds at room temperature. This means that both deep and shallow traps emit slowly at the operating temperature of solar cells—thus, the traps can be recombination centers.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 763: Symposium B – Compound Semiconductor Photovoltaics , 2003 , B2.6
Copyright
Copyright © Materials Research Society 2003

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