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Title: Oxygen migration enthalpy likely limits oxide precipitate dissolution during tabula rasa

Abstract

In industrial silicon solar cells, oxygen-related defects lower device efficiencies by up to 20% (rel.). In order to mitigate these defects, a high-temperature homogenization anneal called tabula rasa (TR) that has been used in the electronics industry is now proposed for use in solar-grade wafers. This work addresses the kinetics of tabula rasa by elucidating the activation energy governing oxide precipitate dissolution, which is found to be 2.6 +/- 0.5 eV. This value is consistent within uncertainty to the migration enthalpy of oxygen interstitials in silicon, implying TR to be kinetically limited by oxygen point-defect diffusion. This large activation energy is observed to limit oxygen precipitate dissolution during standard TR conditions, suggesting that more aggressive annealing conditions than conventionally used are required for complete bulk microdefect mitigation.

Authors:
ORCiD logo; ; ; ; ; ;
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S), SunShot National Laboratory Multiyear Partnership (SuNLaMP)
OSTI Identifier:
1400367
Report Number(s):
NREL/JA-5J00-70316
Journal ID: ISSN 0003-6951
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 111; Journal Issue: 13
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; chemical compounds; enthalpy; activation energies; solar cells; defect diffusion

Citation Formats

Looney, E. E., Laine, H. S., Youssef, A., Jensen, M. A., LaSalvia, V., Stradins, P., and Buonassisi, T. Oxygen migration enthalpy likely limits oxide precipitate dissolution during tabula rasa. United States: N. p., 2017. Web. doi:10.1063/1.4987144.
Looney, E. E., Laine, H. S., Youssef, A., Jensen, M. A., LaSalvia, V., Stradins, P., & Buonassisi, T. Oxygen migration enthalpy likely limits oxide precipitate dissolution during tabula rasa. United States. doi:10.1063/1.4987144.
Looney, E. E., Laine, H. S., Youssef, A., Jensen, M. A., LaSalvia, V., Stradins, P., and Buonassisi, T. Mon . "Oxygen migration enthalpy likely limits oxide precipitate dissolution during tabula rasa". United States. doi:10.1063/1.4987144.
@article{osti_1400367,
title = {Oxygen migration enthalpy likely limits oxide precipitate dissolution during tabula rasa},
author = {Looney, E. E. and Laine, H. S. and Youssef, A. and Jensen, M. A. and LaSalvia, V. and Stradins, P. and Buonassisi, T.},
abstractNote = {In industrial silicon solar cells, oxygen-related defects lower device efficiencies by up to 20% (rel.). In order to mitigate these defects, a high-temperature homogenization anneal called tabula rasa (TR) that has been used in the electronics industry is now proposed for use in solar-grade wafers. This work addresses the kinetics of tabula rasa by elucidating the activation energy governing oxide precipitate dissolution, which is found to be 2.6 +/- 0.5 eV. This value is consistent within uncertainty to the migration enthalpy of oxygen interstitials in silicon, implying TR to be kinetically limited by oxygen point-defect diffusion. This large activation energy is observed to limit oxygen precipitate dissolution during standard TR conditions, suggesting that more aggressive annealing conditions than conventionally used are required for complete bulk microdefect mitigation.},
doi = {10.1063/1.4987144},
journal = {Applied Physics Letters},
number = 13,
volume = 111,
place = {United States},
year = {Mon Sep 25 00:00:00 EDT 2017},
month = {Mon Sep 25 00:00:00 EDT 2017}
}