Study of the microstructures and lifetime of spin-cast silicon sheets for photovoltaics

Hyunhui Kim, Jaewoo Lee, Changbum Lee, Joonsoo Kim, Bo Yun Jang, Jinseok Lee, Youngsoo Ahn, Wooyoung Yoon

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Silicon sheets were fabricated by a new fabricating method, spin casting with various rotation speeds of the graphite mold. The microstructure of spin-cast silicon sheets were investigated using an electron probe microanalyzer (EPMA) and scanning electron microscope/electron backscatter diffraction/orientation image micrograph, and the lifetime of the sheets was mapped using microwave photoconductance decay. The silicon sheets were vertically aligned, with sizes ranging from tens of microns to one hundred microns. The as-grown lifetime was measured and found to range from 0.049 μs to 0.250 μs. The ASTM number was plotted against the lifetime using ASTM E112 to estimate the grain size. Approximately half of the grain boundaries seemed electrically inactive with meaning of no recombination center since the grains were growth directionally, especially in a longitudinal aligned. It was confirmed that the lifetime of spin-cast sheets makes them suitably applicable for photovoltaics compared to those produced by alternative ribbon-producing methods.

Original languageEnglish
Pages (from-to)3559-3563
Number of pages5
JournalJournal of Nanoscience and Nanotechnology
Volume13
Issue number5
DOIs
Publication statusPublished - 2013 May 1

Keywords

  • Lifetime
  • Microstructure
  • Multicrystalline
  • Photovoltaic
  • Ribbon
  • Silicon sheet
  • Solar cell
  • Spin casting

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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