Overview
IEC TS 62607-6-9:2022 - Nanomanufacturing – Key control characteristics – Part 6-9: Graphene-based material – Sheet resistance: Eddy current method (Edition 1.0, 2022) is an IEC Technical Specification from TC 113 that defines a standardized, non-contact method to measure sheet resistance of graphene-based films using an eddy current technique. The method uses a coil-generated alternating electromagnetic field to induce eddy currents in the conductive graphene layer; the resulting secondary field is measured and correlated to sheet resistance. The specification targets contactless electrical characterization and quality control of large-area graphene layers on non-conductive substrates.
Key topics and technical requirements
- Measurement principle: Coil-driven primary AC field induces eddy currents; the superposed fields relate to sheet resistance.
- Measurement configuration & modes:
- Single-point mode for spot measurements.
- Imaging/scanning mode for mapping large-area homogeneity.
- Measurement system components:
- Measurement equipment (coils, detectors - typically two detectors: above and below substrate to reduce sensitivity to substrate flatness).
- Calibration standards and procedures.
- Defined ambient condition controls and sample preparation methods.
- Measurement procedure:
- Calibration of test equipment, verification steps, and standardized measurement workflows.
- Data analysis & interpretation:
- Single-point results, sheet resistance imaging, line-profile analysis, histogram analysis and statistical assessment.
- Individual homogeneity assessment and defect identification procedures.
- Test reporting: Required elements include sample identification, test conditions, measurement specifics and results; Annex A provides a worked example and test report template.
- Supporting material: Informative annexes include a comparison with four-point probe (contact) measurements, a quality-inspection use case, and reference sample sets.
Practical applications and users
- Applications:
- Electrical characterization of large-area graphene for transparent conductive electrodes (e.g., ITO replacement).
- Inline or laboratory quality control and homogeneity mapping in graphene production.
- Non-destructive testing where contact methods (four‑point probe) could damage delicate films.
- Who uses this standard:
- Nanomanufacturing process engineers and production quality teams.
- Materials scientists and metrology labs performing sheet resistance measurements.
- Equipment manufacturers of eddy-current measurement systems.
- Standardization and conformity assessment bodies comparing non-contact and contact methods.
Related standards and references
- Part of the IEC TS 62607 series on nanomanufacturing key control characteristics - see IEC webstore for the full series.
- Informative comparison with four‑point probe techniques is provided (Annex B) for users deciding between contact and non‑contact measurement approaches.
Keywords: IEC TS 62607-6-9, sheet resistance, eddy current method, graphene-based material, non-contact measurement, large-area graphene, quality control, four-point probe, sheet resistance mapping.