Properties of the c-Si/Al2O3 interface of ultrathin atomic layer deposited Al2O3 layers capped by SiNx for c-Si surface passivation

This work presents a detailed study of c-Si/Al2O3 interfaces of ultrathin Al2O3 layers deposited with atomic layer deposition (ALD), and capped with SiNx layers deposited with plasma-enhanced chemical vapor deposition. A special focus was the characterization of the fixed charge density of these die...

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Veröffentlicht in:Applied physics letters 2014-12, Vol.105 (23)
Hauptverfasser: Schuldis, D., Richter, A., Benick, J., Saint-Cast, P., Hermle, M., Glunz, S. W.
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container_issue 23
container_start_page
container_title Applied physics letters
container_volume 105
creator Schuldis, D.
Richter, A.
Benick, J.
Saint-Cast, P.
Hermle, M.
Glunz, S. W.
description This work presents a detailed study of c-Si/Al2O3 interfaces of ultrathin Al2O3 layers deposited with atomic layer deposition (ALD), and capped with SiNx layers deposited with plasma-enhanced chemical vapor deposition. A special focus was the characterization of the fixed charge density of these dielectric stacks and the interface defect density as a function of the Al2O3 layer thickness for different ALD Al2O3 deposition processes (plasma-assisted ALD and thermal ALD) and different thermal post-deposition treatments. Based on theoretical calculations with the extended Shockley–Read–Hall model for surface recombination, these interface properties were found to explain well the experimentally determined surface recombination. Thus, these interface properties provide fundamental insights into to the passivation mechanisms of these Al2O3/SiNx stacks, a stack system highly relevant, particularly for high efficiency silicon solar cells. Based on these findings, it was also possible to improve the surface passivation quality of stacks with thermal ALD Al2O3 by oxidizing the c-Si surface prior to the Al2O3 deposition.
doi_str_mv 10.1063/1.4903483
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Thus, these interface properties provide fundamental insights into to the passivation mechanisms of these Al2O3/SiNx stacks, a stack system highly relevant, particularly for high efficiency silicon solar cells. 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subjects Aluminum oxide
Applied physics
Atomic layer epitaxy
Charge density
Interfacial properties
Organic chemistry
Oxidation
Passivity
Photovoltaic cells
Plasma enhanced chemical vapor deposition
Silicon
Solar cells
Stacks
Thickness
title Properties of the c-Si/Al2O3 interface of ultrathin atomic layer deposited Al2O3 layers capped by SiNx for c-Si surface passivation
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