Evaluating root cause : the distinct roles of hydrogen and firing in activating light- and elevated-temperature induced degradation

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2018
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Jensen, Mallory
Wieghold, Sarah
Morishige, Ashley
Buonassisi, Tonio
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2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) : (a joint conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC) : 10-15 June 2018. - Piscataway, NJ : IEEE, 2018. - pp. 321-324. - ISBN 978-1-5386-8529-7
Abstract
The root cause of light- and elevated temperature-induced degradation (LeTID) in multicrystalline silicon p-type passivated emitter and rear cell (PERC) devices is still unknown. In this contribution, the bulk hydrogen concentration is varied using microwave-induced remote hydrogen plasma (MIRHP). This technique allows us to separate the effects of hydrogen and firing temperature in LeTID-affected wafers. We find that hydrogen is required for degradation to occur, and that samples fired prior to the introduction of hydrogen do not degrade. We conclude that firing is not required to cause LeTID. Together, these observations suggest that hydrogen, rather than metal-rich precipitates that dissolve during firing, for example, plays a determining role in LeTID.
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530 Physics
Keywords
silicon, photovoltaics, degradation, hydrogen
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7th IEEE World Conference on Photovoltaic Energy Conversion (WCPEC), Jun 10, 2018 - Jun 15, 2018, Waikoloa Village, Hawaii
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ISO 690JENSEN, Mallory, Annika ZUSCHLAG, Daniel SKORKA, Sarah WIEGHOLD, Ashley MORISHIGE, Giso HAHN, Tonio BUONASSISI, 2018. Evaluating root cause : the distinct roles of hydrogen and firing in activating light- and elevated-temperature induced degradation. 7th IEEE World Conference on Photovoltaic Energy Conversion (WCPEC). Waikoloa Village, Hawaii, Jun 10, 2018 - Jun 15, 2018. In: 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) : (a joint conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC) : 10-15 June 2018. Piscataway, NJ:IEEE, pp. 321-324. ISBN 978-1-5386-8529-7. Available under: doi: 10.1109/PVSC.2018.8547860
BibTex
@inproceedings{Jensen2018Evalu-47125,
  year={2018},
  doi={10.1109/PVSC.2018.8547860},
  title={Evaluating root cause : the distinct roles of hydrogen and firing in activating light- and elevated-temperature induced degradation},
  isbn={978-1-5386-8529-7},
  publisher={IEEE},
  address={Piscataway, NJ},
  booktitle={2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) : (a joint conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC) : 10-15 June 2018},
  pages={321--324},
  author={Jensen, Mallory and Zuschlag, Annika and Skorka, Daniel and Wieghold, Sarah and Morishige, Ashley and Hahn, Giso and Buonassisi, Tonio}
}
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