Testing and Environmental equipment

Contact Resistance Tester

MD-TLM STD
Product description: Contact Resistance Tester
INQUIRY

1. Product Overview

Contact resistance is a critical factor to consider when optimizing solar cell electrodes.

The magnitude of contact resistance depends not only on the contact pattern but also on the diffusion and firing processes.

Measuring contact resistivity helps identify issues within processes such as diffusion, electrode fabrication, and firing.

The MD-TLMSTD contact resistivity tester offers two switchable testing functions: contact resistivity measurement and line resistance measurement. The testing principles are as follows:

The measured resistance consists of three components:

1) The metal contact resistance Rm between the probes and the electrodes (which is negligible as Rm << Rc);

2) The contact resistance Rc between the electrodes and the material under investigation;

3) The sheet resistance Rsh of the semiconductor material.

By varying the electrode spacing d, one can obtain the relationship curve between RTLM and d, thereby extracting the interfacial contact resistance Rc and the sheet resistance Rsh of the material under investigation.

3. Technical Specifications

Name	Specifications
Applicable battery type	Sizes up to 230mm; thickness 100–220µm
Stage size	250mm × 250mm
Stage control	Precision module control; travel range 250mm × 250mm; vacuum hold-down; microscope-assisted alignment
Test range	Contact resistivity: 0–3500 mΩ·cm² Line resistance measurement range: 0–35,000 Ω/cm
Measurable sample width	5–10 mm
Resistance resolution	1 µΩ
Measurement current	10 mA (user-replaceable)
Test repeatability	Static ≤1.5%, Dynamic <4% (Dynamic: based on 5 tests on a standard sample)
Test pressure/release control	Precision motorized positioning axes; programmable intelligent control of probe downforce; control accuracy up to 5 µm
Measurement method	Automatic X, Y, and Z axes
Number of measurement points	4–8
Basic probe specifications	Materials: Probe shaft – Beryllium copper; Sleeve – Gold-plated brass Probe diameter: 0.9 mm Probe diameter: 0.9 mm Probe pressure: Adjustable (0.4–0.7 N) Probe lifespan: >100,000 cycles Insulation resistance between probes: ≥1000 MΩ Mechanical drift rate: ≤0.3%
Probe Spacing	Standard: "1.2–1.8 mm adjustable probe"; "0.8 mm, 0.9 mm, 1.0 mm, and 1.1 mm fixed probes" Optional: Other specifications can be customized upon request
Software Features	1. Test data analysis and storage functions 2. Measurement data exportable to Excel format

4. Product Configuration List

Name	Quantity	Specifications
TLM Main Unit	1
Test Platform	1
Contact Resistance Probe Head	5
Line Resistance Probe Head	1
Vacuum Pump	1
Control Computer	1
Control Software	1
Product Manual	1
Laser Scribing Machine	1	Optional (customer-supplied)
Reference Standard	1	Includes third-party test report
Tools	1	Vacuum pickup pen, tweezers, hex key
Factory Inspection Report	1	Standard
Certificate of Conformity, Warranty Card	1	Standard