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Internal sensor compensation for increased Ca test sensitivity.

Arrelaine A Dameron1, Michael D Kempe1, Matthew O Reese1

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Summary

This study enhances a calcium (Ca)-based electrical technique for precise water vapor transmission rate measurements. The improvements enable faster, more reproducible testing of barrier films for displays and photovoltaics.

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Area of Science:

  • Materials Science
  • Thin Film Technology
  • Measurement Science

Background:

  • Accurate water vapor permeation measurement is critical for advanced barrier films and encapsulation in displays and photovoltaics.
  • Existing techniques may lack speed, precision, or introduce handling concerns.
  • Electrical methods offer potential for rapid, in-situ measurements.

Purpose of the Study:

  • To improve an existing electrical, calcium (Ca)-trace-based water vapor transmission rate (WVTR) measurement technique.
  • To enhance precision, reduce measurement time, and increase reproducibility without added cost or complexity.
  • To enable more accurate characterization of barrier films for demanding applications.

Main Methods:

  • Modified the contacting scheme to precisely determine the effective length of sensor traces, minimizing contact resistance effects.
  • Implemented a 4-point contacting pattern on internal witness traces for error compensation.
  • Utilized a Ca sensor trace with higher electrical resistance to improve measurement precision.

Main Results:

  • Achieved significant improvements in WVTR measurements, particularly for rates below 10(-4) g/m(2)/day.
  • Reduced the noise floor and required measurement time for barrier film testing.
  • Demonstrated increased reproducibility of the WVTR measurement method.

Conclusions:

  • The refined electrical WVTR technique offers enhanced performance for evaluating barrier films.
  • The improvements facilitate faster and more reliable characterization of materials for displays and photovoltaics.
  • This method provides a cost-effective solution for precise water vapor permeation analysis.