Lifetime Analysis for Defect Characterization in Kerfless Epitaxial Silicon from the Porous Silicon Process

Publikation: Beitrag in FachzeitschriftKonferenzaufsatz in FachzeitschriftForschungPeer-Review

Autoren

  • Catherin Gemmel
  • Jan Hensen
  • Sarah Kajari-Schröder
  • Rolf Brendel

Organisationseinheiten

Externe Organisationen

  • Institut für Solarenergieforschung GmbH (ISFH)
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Details

OriginalspracheEnglisch
Seiten (von - bis)29-36
Seitenumfang8
FachzeitschriftEnergy Procedia
Jahrgang92
PublikationsstatusVeröffentlicht - Aug. 2016
Veranstaltung6th International Conference on Crystalline Silicon Photovoltaics, SiliconPV 2016 - Chambery, Frankreich
Dauer: 7 März 20169 März 2016

Abstract

Kerfless epitaxial silicon from the porous silicon (PSI) process is a promising alternative for standard wafers. They allow the reduction of PV costs by combining high material quality at reduced production costs. We evaluate the minority carrier lifetime of p-type and n-type epitaxial silicon layers fabricated with the PSI process by means of photoconductance decay measurements. For p-type layers we observe a strong injection dependence of the lifetime that we attribute to bulk Shockley-Read-Hall (SRH) recombination. We determine two limiting defects K3.6 and K157 that describe the injection dependence of 9 samples grown in one batch. Defect K3.6 has a symmetry factor of k=3.6 and is similarly concentrated in all 9 investigated samples. Its concentration decreases upon high temperature processing with and without phosphorous diffusion. The defect K157 has a symmetry factor of k=157 and a higher concentration in samples with a higher porosity in the starting layer. As a consequence of the k-factors being larger than unity the identified defects are less detrimental in n-type silicon than p-type silicon. Accordingly, we fabricate n-type epitaxial layers for which we measure effective lifetimes up to 1330±130 μs at Δp = 1015 cm -3.

ASJC Scopus Sachgebiete

Zitieren

Lifetime Analysis for Defect Characterization in Kerfless Epitaxial Silicon from the Porous Silicon Process. / Gemmel, Catherin; Hensen, Jan; Kajari-Schröder, Sarah et al.
in: Energy Procedia, Jahrgang 92, 08.2016, S. 29-36.

Publikation: Beitrag in FachzeitschriftKonferenzaufsatz in FachzeitschriftForschungPeer-Review

Gemmel C, Hensen J, Kajari-Schröder S, Brendel R. Lifetime Analysis for Defect Characterization in Kerfless Epitaxial Silicon from the Porous Silicon Process. Energy Procedia. 2016 Aug;92:29-36. doi: 10.1016/j.egypro.2016.07.006
Gemmel, Catherin ; Hensen, Jan ; Kajari-Schröder, Sarah et al. / Lifetime Analysis for Defect Characterization in Kerfless Epitaxial Silicon from the Porous Silicon Process. in: Energy Procedia. 2016 ; Jahrgang 92. S. 29-36.
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AU - Gemmel, Catherin

AU - Hensen, Jan

AU - Kajari-Schröder, Sarah

AU - Brendel, Rolf

PY - 2016/8

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N2 - Kerfless epitaxial silicon from the porous silicon (PSI) process is a promising alternative for standard wafers. They allow the reduction of PV costs by combining high material quality at reduced production costs. We evaluate the minority carrier lifetime of p-type and n-type epitaxial silicon layers fabricated with the PSI process by means of photoconductance decay measurements. For p-type layers we observe a strong injection dependence of the lifetime that we attribute to bulk Shockley-Read-Hall (SRH) recombination. We determine two limiting defects K3.6 and K157 that describe the injection dependence of 9 samples grown in one batch. Defect K3.6 has a symmetry factor of k=3.6 and is similarly concentrated in all 9 investigated samples. Its concentration decreases upon high temperature processing with and without phosphorous diffusion. The defect K157 has a symmetry factor of k=157 and a higher concentration in samples with a higher porosity in the starting layer. As a consequence of the k-factors being larger than unity the identified defects are less detrimental in n-type silicon than p-type silicon. Accordingly, we fabricate n-type epitaxial layers for which we measure effective lifetimes up to 1330±130 μs at Δp = 1015 cm -3.

AB - Kerfless epitaxial silicon from the porous silicon (PSI) process is a promising alternative for standard wafers. They allow the reduction of PV costs by combining high material quality at reduced production costs. We evaluate the minority carrier lifetime of p-type and n-type epitaxial silicon layers fabricated with the PSI process by means of photoconductance decay measurements. For p-type layers we observe a strong injection dependence of the lifetime that we attribute to bulk Shockley-Read-Hall (SRH) recombination. We determine two limiting defects K3.6 and K157 that describe the injection dependence of 9 samples grown in one batch. Defect K3.6 has a symmetry factor of k=3.6 and is similarly concentrated in all 9 investigated samples. Its concentration decreases upon high temperature processing with and without phosphorous diffusion. The defect K157 has a symmetry factor of k=157 and a higher concentration in samples with a higher porosity in the starting layer. As a consequence of the k-factors being larger than unity the identified defects are less detrimental in n-type silicon than p-type silicon. Accordingly, we fabricate n-type epitaxial layers for which we measure effective lifetimes up to 1330±130 μs at Δp = 1015 cm -3.

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KW - mono-epitaxy

KW - Shockley-Read-Hall

KW - silicon

KW - symmetry factor

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