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TiO2/porous silicon nanocomposite passivation coating for mc-Si wafers

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Abstract

This work reports on passivation effect of solar-grade multicrystalline Si (mc-Si) using a TiO2/porous silicon double coating. For this purpose, TiO2 nanoparticles were deposited onto porous silicon (PS)/mc-Si using pulsed laser ablation of titanium target. The structural and optoelectronic properties of the TiO2/PS treated mc-Si substrates were investigated by X-ray diffraction, Raman spectroscopy, optical spectrometry, photo-conductance and photoluminescence (PL). It was found that the minority carrier lifetime (τ eff) of the mc-Si wafer could enhance at a nominal thickness of the TiO2 film (nanoparticle sizes). This was attributed to a surface passivation of the mc-Si wafer via TiO2-passivation of the PS film, whose PL intensity improves consequently. An optimal TiO2 thickness of 80 nm was found to give the highest PL intensity and an enhancement of the minority carrier lifetime from 5 µs for untreated mc-Si wafer to about 391 µs for a TiO2/PS treated wafers.

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Authors and Affiliations

  1. Laboratoire de Photovoltaïque, Centre de Recherches et des Technologies de l’Energie, Technopole de Borj-Cédria, BP 95, 2050, Hammam-Lif, Tunisia

    N. Janene, M. Salem, M. Ben Rabha & B. Bessais

  2. Institut National de la Recherche Scientifique, INRS-Énergie, Matériaux et Télécommunications, 1650, Blvd. Lionel-Boulet, Varennes, QC, J3X-1S2, Canada

    M. A. El Khakani

  3. Department of Applied Physics, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates

    H. Alawadhi & M. Gaidi

Authors
  1. N. Janene
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  2. M. Salem
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  3. M. Ben Rabha
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  4. M. A. El Khakani
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  5. B. Bessais
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  6. H. Alawadhi
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  7. M. Gaidi
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Correspondence to M. Gaidi.

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Janene, N., Salem, M., Ben Rabha, M. et al. TiO2/porous silicon nanocomposite passivation coating for mc-Si wafers. J Mater Sci: Mater Electron 26, 1585–1590 (2015). https://doi.org/10.1007/s10854-014-2579-6

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  • DOI: https://doi.org/10.1007/s10854-014-2579-6

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