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Passivation property of Al2O3 thin film for the application of n-type crystalline Si solar cells

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2014, 24(3), pp.106-110
  • DOI : 10.6111/JKCGCT.2014.24.3.106
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

Myeong-Il Jeong 1 Choi Chel Jong 1

1전북대학교

Accredited

ABSTRACT

The passivation property of Al2O3 thin film formed using atomic layer deposition (ALD) for the application ofcrystalline Si solar cells was investigated using microwave photoconductance decay (μ-PCD). After post-annealing at 400oCfor 5 min, Al2O3 thin film exhibited the structural stability having amorphous nature without the interfacial reaction betweenAl2O3 and Si. The post-annealing at 400oC for 5 min led to an increase in the relative effective lifetime of Al2O3 thin film. This could be associated with the field effective passivation combined with surface passivation of textured Si. Thecapacitance-voltage (C-V) characteristics of the metal-oxide-semiconductor (MOS) with Al2O3 thin film post-annealed at400oC for 5 min was carried out to evaluate the negative fixed charge of Al2O3 thin film. From the relationship betweenflatband voltage (VFB) and equivalent oxide thickness (EOT), which were extracted from C-V characteristics, the negativefixed charge of Al2O3 thin film was calculated to be 2.5 × 1012cm−2, of which value was applicable to the passivation layerof n-type crystalline Si solar cells.

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