Quantitative surface recombination imaging of single side processed silicon wafers obtained by photoluminescence modeling

Andreas Fell*, Daniel Walter, Xinbo Yang, Sachin Surve, Evan Franklin, Klaus Weber, Daniel MacDonald

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

5 Scopus citations

Abstract

Characterizing the surface recombination of a silicon wafer is commonly performed by measuring the effective lifetime of a symmetrically processed sample and using simplified analytical models to derive a characteristic property of the recombination, such as the surface recombination factor J 0s . The most widely used method is based on QSSPC measurements which require large, homogeneously processed areas and is valid only for uniform carrier distributions throughout the thickness of the sample. In this work we present an alternative method for deriving the surface recombination properties from photoluminescence (PL) images of single side processed wafers, where the rear side minority carrier density is pinned by a highly-recombining surface. By numerically modelling the photoluminescence signal and calibrating it against an independent and well characterized sample, PL images can be quickly converted into, for example, J 0s images. We experimentally validate the method and show its robustness and limits by modelling the uncertainty of sample properties and measurement conditions. The method has the advantage of requiring minimal sample preparation. The use of an imaging technique allows numerous parameters to be characterized on a single sample, as is demonstrated by its application to laser-doped silicon.

Original languageEnglish (US)
Pages (from-to)63-70
Number of pages8
JournalEnergy Procedia
Volume55
DOIs
StatePublished - Jan 1 2014
Event4th International Conference on Crystalline Silicon Photovoltaics, SiliconPV 2014 - Hertogenbosch, Netherlands
Duration: Mar 25 2014Mar 27 2014

Keywords

  • Luminescence modeling
  • PL imaging
  • Quokka
  • Silicon solar cell
  • Surface recombination

ASJC Scopus subject areas

  • Energy(all)

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