Laser-silicon interaction for selective emitter formation in photovoltaics. I. Numerical model and validation

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Laser doping to form selective emitters offers an attractive method to increase the performance of silicon wafer based photovoltaics. However, the effect of processing conditions, such as laser power and travel speed, on molten zone geometry and the phosphorus dopant profile is not well understood. A mathematical model is developed to quantitatively investigate and understand how processing parameters impact the heat and mass transfer and fluid flow during laser doping using continuous wave lasers. Calculated molten zone dimensions and dopant concentration profiles are in good agreement with independent experimental data reported in the literature. The mechanisms for heat (conduction) and mass (convection) transport are examined, which lays the foundation for quantitatively understanding the effect of processing conditions on molten zone geometry and dopant concentration distribution. The validated model and insight into heat and mass transport mechanisms also provide the bases for developing process maps, which are presented in part II. These maps illustrate the effects of output power and travel speed on molten zone geometry, average dopant concentration, dopant profile shape, and sheet resistance.

Original languageEnglish (US)
Article number114906
JournalJournal of Applied Physics
Volume112
Issue number11
DOIs
StatePublished - Dec 1 2012

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emitters
travel
silicon
profiles
geometry
lasers
continuous wave lasers
interactions
conductive heat transfer
fluid flow
mass transfer
phosphorus
mathematical models
convection
heat transfer
wafers
heat
output

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

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abstract = "Laser doping to form selective emitters offers an attractive method to increase the performance of silicon wafer based photovoltaics. However, the effect of processing conditions, such as laser power and travel speed, on molten zone geometry and the phosphorus dopant profile is not well understood. A mathematical model is developed to quantitatively investigate and understand how processing parameters impact the heat and mass transfer and fluid flow during laser doping using continuous wave lasers. Calculated molten zone dimensions and dopant concentration profiles are in good agreement with independent experimental data reported in the literature. The mechanisms for heat (conduction) and mass (convection) transport are examined, which lays the foundation for quantitatively understanding the effect of processing conditions on molten zone geometry and dopant concentration distribution. The validated model and insight into heat and mass transport mechanisms also provide the bases for developing process maps, which are presented in part II. These maps illustrate the effects of output power and travel speed on molten zone geometry, average dopant concentration, dopant profile shape, and sheet resistance.",
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Laser-silicon interaction for selective emitter formation in photovoltaics. I. Numerical model and validation. / Blecher, J. J.; Palmer, Todd; Debroy, Tarasankar.

In: Journal of Applied Physics, Vol. 112, No. 11, 114906, 01.12.2012.

Research output: Contribution to journalArticle

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AU - Blecher, J. J.

AU - Palmer, Todd

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