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Characterization of a Dominant Electron Trap in GaNAs Using Deep-Level Transient Spectroscopy

Published online by Cambridge University Press:  01 February 2011

Steven W. Johnston ,
Sarah R. Kurtz  and
Richard S. Crandall
Steven W. Johnston
Affiliation:
steve_johnston@nrel.gov, National Renewable Energy Laboratory, 1617 Cole Blvd., Golden, CO, 80401, United States, 303-384-6466, 303-384-6604
Sarah R. Kurtz
Affiliation:
sarah_kurtz@nrel.gov, National Renewable Energy Laboratory, United States
Richard S. Crandall
Affiliation:
richard_crandall@nrel.gov, National Renewable Energy Laboratory, United States
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Abstract

Dilute-nitrogen GaNAs epitaxial layers grown by metal-organic chemical vapor deposition were characterized by deep-level transient spectroscopy (DLTS). For all samples, the dominant DLTS signal corresponds to an electron trap having an activation energy of about 0.25 to 0.35 eV. The minority-carrier trap density in the p-type material is quantified based on computer simulation of the devices. The simulations show that only about 2% of the traps in the depleted layer are filled during the transient. The fraction of the traps that are filled depends strongly on the depth of the trap, but only weakly on the doping of the layers and on the conduction-band offset. The simulations provide a pathway to obtain semi-quantitative data for analysis of minority-carrier traps by DLTS.

Keywords

deep level transient spectroscopy (DLTS)defectselectrical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 891: Symposium EE – Progress in Semiconductor Materials V – Novel Materials and Electronics and Optoelectronic Applications , 2005 , 0891-EE10-35
Copyright
Copyright © Materials Research Society 2006

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References

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