Numerical forecast of redzone extension in cast silicon ingots in dependence on the purity level of crucible, coating and feedstock

Schwanke S, Trempa M, Schuck K, Kranert C, Mueller M, Reimann C, Kuczynski M, Schroll G, Sans J, Stenzenberger J, Hesse K, Heitmann J, Friedrich J (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Journal of Crystal Growth Elsevier

Book Volume: 574

DOI: 10.1016/j.jcrysgro.2021.126304

Abstract

The extension of the areas with extremely low minority carrier lifetime in cast silicon ingots for photovoltaic application is a crucial parameter for the industrial manufacturers determining the yield of the grown Si ingot material usable for solar cell fabrication. In order to make a forecast of this redzone extension in dependence on the purity levels of the consumables like crucible, Si3N4-coating and Si-feedstock, a numerical 2D model was used to investigate the diffusive iron (Fe) incorporation into the silicon during the directional solidification process. In order to set up this model, the diffusion parameters of Fe in crucible and Si3N4-coating were determined by 1D numerical analysis of annealing experiments. These values were used in a 2D model to simulate several G1 experiments with varying Fe impurity levels of all crucible consumables (SiO2-crucible and internal Si3N4-coating).

Involved external institutions

Fraunhofer-Institut für Integrierte Systeme und Bauelementetechnologie (IISB) DE Germany (DE) Fraunhofer Technologiezentrum Halbleitermaterialien (THM) DE Germany (DE) Technische Universität Bergakademie Freiberg DE Germany (DE) AlzChem Group AG DE Germany (DE) Wacker Chemie AG DE Germany (DE)

How to cite

APA:

Schwanke, S., Trempa, M., Schuck, K., Kranert, C., Mueller, M., Reimann, C.,... Friedrich, J. (2021). Numerical forecast of redzone extension in cast silicon ingots in dependence on the purity level of crucible, coating and feedstock. Journal of Crystal Growth, 574. https://doi.org/10.1016/j.jcrysgro.2021.126304

MLA:

Schwanke, S., et al. "Numerical forecast of redzone extension in cast silicon ingots in dependence on the purity level of crucible, coating and feedstock." Journal of Crystal Growth 574 (2021).

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