1. In situ ultrasonic interface tracking for photovoltaic silicon directional solidification
- Author
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Miralles, Sophie, Albaric, Mickael, Brizé, Virginie, Guy, Philippe, Vincent, Bjarne, Garandet, Jean-Paul, Henry, Daniel, Botton, Valéry, Laboratoire de Mecanique des Fluides et d'Acoustique (LMFA), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Institut National de L'Energie Solaire (INES), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Laboratoire Vibrations Acoustique (LVA), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), INSA Euro-Méditerranée, Institut National des Sciences Appliquées (INSA), Université de Lyon-Institut National des Sciences Appliquées (INSA), The ASTRES and BRASSOA projects supported by Ingénierie@Lyon, and AWINSI project, Ingénierie@Lyon and Energies du Futur
- Subjects
B2. Semi-conducting silicon ,A1. Directional solidification ,A1. Interfaces ,A1. Characterization ,[SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph] ,A1. Acoustic diagnostics - Abstract
This paper presents an experimental validation of an in situ ultrasound technique for tracking the solid-liquid interface during directional solidification of photovoltaic silicon. Ultrasound bursts are introduced from the top into the melt via the tip of a carbon glass waveguide directly plunged into the liquid. Several runs of solidification have been conducted using the same waveguide thus demonstrating its reusability, its mechanical resilience and its appropriate acoustical and chemical compatibility with the melt. We present the times of flight analysis to track the location of the solid-liquid interface. As part of the signal crosses the solidifying ingot, we also measure $c_s$ , the average celerity of sound waves in the solid. Since $c_s$ exhibits a significant dependance on crystal orientation, we consider the possibility to use the echoes to extract some information on the crystalline orientation in the ingot. By quantifying the uncertainties and their dependence with the duration of the experiment in particular, we outline the conditions necessary to detect accurately the average orientation in the solid.
- Published
- 2023