Investigation of Si dendrites by electron-beam-induced current

Wei Yi, Jun Chen, Shun Ito, Koji Nakazato, Takashi Kimura, Takashi Sekiguchi, Kozo Fujiwara

Research output: Contribution to journalArticle

Abstract

This paper reports on electron-beam-induced current (EBIC) characterization of special multicrystalline Si ingot by dendritic growth under high undercooling. Grain boundaries (GBs), dislocations, and their interaction with carbon related precipitates were investigated. The difference between grains from dendrite and non-dendrite growth was compared. In dendrite grains, parallel twins were frequently found. In non-dendrite grains, irregular GBs of various characters co-existed. Both parallel twins and irregular GBs exhibited dark EBIC contrast at room temperature, indicating the presence of minority carrier recombination centers due to impurity contamination. However, sometimes in non-dendrite grains GBs were visualized with bright EBIC contrast with enhanced collection of charge carriers. The origin of the abnormal bright EBIC contrast was explored and it turned out to be SiC related precipitates, which made GBs conduction channels for electron transport.

Original languageEnglish
Article number317
JournalCrystals
Volume8
Issue number8
DOIs
Publication statusPublished - 2018 Aug

Keywords

  • Dendrite
  • EBIC
  • Grain boundaries
  • mc-Si

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Inorganic Chemistry

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  • Cite this

    Yi, W., Chen, J., Ito, S., Nakazato, K., Kimura, T., Sekiguchi, T., & Fujiwara, K. (2018). Investigation of Si dendrites by electron-beam-induced current. Crystals, 8(8), [317]. https://doi.org/10.3390/cryst8080317