Bistable character of a deep level in polycrystalline Si substrate for solar cell

Y. Yamashita, M. Ochi, H. Yoshinaga, Y. Kamiura, T. Ishiyama

Research output: Contribution to journalArticlepeer-review


Electronic levels in polycrystalline Si (pc-Si) substrates for solar cells were studied by means of deep level transient spectroscopy (DLTS). A broad peak was observed at around 250 K when samples with grain boundaries (GBs) were thermally treated. The origin of this peak was investigated and we conclude that it is attributed to Cu contaminants gathered around GBs. We found interesting character of this peak. The peak intensity became small by annealing with reverse-biased voltage on the Schottky junction and it was recovered after keeping the sample at room temperature for several days. We explained this character as bistability of the center depending on its charge state. From the application viewpoint, we tried remote hydrogen-plasma treatment and could annihilate the peak.

Original languageEnglish
Pages (from-to)5071-5074
Number of pages4
JournalPhysica B: Condensed Matter
Issue number23-24
Publication statusPublished - Dec 15 2009


  • Bistability
  • Copper
  • Grain boundary
  • Hydrogen passivation
  • Polycrystalline Si

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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