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Measure contact resistivity | Measure line resistance

Optimize solar cell performance

  • R&D experiments
  • Factory quality control
  • Accurate values for grid modeling
ContactSpot measures line resistance and contact resistivity in solar cells
Contact resistance TLM method controls on ContactSpot

Metal gridline measurement

  • Contact resistivity to silicon (mΩ-cm2)
  • Line resistance (mΩ/cm)
  • Sheet resistance between gridlines (Ω/square)
  • < 30 sec/test including sample loading & alignment
  • 10 current injection and 10 voltage measurement probes
  • Microscope with screen display and x-theta adjustment for fast sample alignment
  • Correction factors for voltage drop down narrow fingers

Benefits over manual contact resistivity measurements

  • Much faster test time
  • More consistent results
  • No room-light artifacts
  • Mapping across the test strip
  • Automated data analysis
  • Advanced algorithms
ContactSpot
ContactSpot tool with case

Specifications

  • Finger to finger resistance measurements

  • Range of resistance measurement    0.1 – 1000 ohms

  • Accuracy of resistance measurement –  0.4%

  • Repeatability – 0.4%

  • Minimum probe pitch- 1.3 mm (every other finger for smaller pitches)

  • Minimum practical finger pitch –  1.1 mm

  • Range of finger pitches on a probe head measuring 5 fingers –  0.8 mm