Differential conductivity mapping of solar panels using a high-T C superconductor SQUID

T. Kiwa, S. Maeda, K. Miyake, N. Kataoka, A. Tsukamoto, S. Adachi, K. Tanabe, A. Kandori, K. Tsukada

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


To visualise the distribution of the electric property of solar cells, we developed a differential conductivity mapping system using high-TC (HTS-) superconductor SQUID with a normal conducting pick-up coil. The bias ac voltage with an offset voltage was applied to a solar panel made from amorphous silicon, and the normal component of the generated magnetic field was lock-in-detected. Thus the measured signal was converted to dB/dV properties, which are inverse-proportional to the differential resistivity, as the function of the offset voltage. By scanning the pick-up coil across the panel surface, we obtained the distribution of dB/dV properties across the solar panel was obtained by scanning the pick-up coil across the panel surface. The distribution of dB/dV on the panel differed between when the light source was on and when it was off. This result suggests that the proposed system is a potential tool for diagnosing the electric properties of solar cells.

Original languageEnglish
Pages (from-to)1238-1241
Number of pages4
JournalPhysica C: Superconductivity and its applications
Issue number21-22
Publication statusPublished - Nov 2011


  • Differential resistivity
  • Non-destructive test
  • Solar panel

ASJC Scopus subject areas

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


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