In-situ chemical analysis of molten photovoltaic silicon by Laser Induced Breakdown Spectroscopy

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Proceedings title2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC), 14-19 June 2015, New Orleans, LA
Conference2015 IEEE 42nd Photovoltaic Specialists Conference (PVSC), June 14-19, 2015, New Orleans, LA
Article number15664187
Subjectspectroscopy; calibration; chemical sensors; laser ablation; melt processing; silicon
AbstractLaser induced breakdown spectroscopy (LIBS) has been used for the first time to determine in-situ the bulk chemical composition of a photovoltaic silicon melt. Our apparatus analyzes a freshly created and renewed surface inside the silicon melt which is truly representative of the melt composition in contrast to its surface. First, signal acquisition conditions are optimized to ensure that LIBS measurements overcome experimental fluctuations. Second, experimental parameters affecting plasma physics such as laser energy, bath temperature and bubbling gas are evaluated to maximize signal sensitivity and instrumental limits. Third, B, Al, Ti and Fe calibration curves are established. Selected conditions allow a reliable measurement which can be compared to classical ex-situ ICP-OES, with detection limit of few or even below ppmw. These results demonstrate the strong capabilities of LIBS for in-situ and in-line monitoring of metallurgical processes used in the photovoltaic industry.
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AffiliationEnergy, Mining and Environment; National Research Council Canada
Peer reviewedYes
NPARC number23001544
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Record identifier37b088a0-b91a-4c15-99ee-ce6d0f37bc2a
Record created2017-03-03
Record modified2017-03-03
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