Copper Interconnects: Thickness 0.1–0.5 mm

Q: Why is copper used for interconnects in thermoelectric modules?

Copper is preferred due to its excellent electrical conductivity (second only to silver), high thermal conductivity, good mechanical strength, and cost-effectiveness, which minimize energy losses and ensure efficient heat transfer in thermoelectric systems.

Q: How do copper interconnects affect thermoelectric module efficiency?

Copper interconnects reduce parasitic electrical resistance and Joule heating, improving the coefficient of performance (COP) and temperature differential capability of the module. Poor interconnects can lead to up to 10–15% efficiency loss.

Component Specifications

Definition

Copper interconnects are critical components in thermoelectric modules, serving as electrical conductors that connect p-type and n-type semiconductor legs. They are typically thin, patterned copper layers or wires that form the electrical circuit, allowing current to pass through the module to generate or absorb heat via the Peltier effect. These interconnects must exhibit high electrical conductivity, thermal stability, and mechanical integrity to ensure efficient energy conversion and long-term reliability in temperature control applications.

Working Principle

Copper interconnects work by providing low-resistance electrical paths between thermoelectric semiconductor materials. When an electric current flows through the interconnects, it drives charge carriers (electrons and holes) across the p-n junctions in the thermoelectric legs, creating a temperature difference via the Peltier effect. The interconnects minimize energy losses due to Joule heating by maintaining high conductivity, while their design ensures uniform current distribution across all thermoelectric pairs for optimal performance.

Materials

High-purity copper (≥99.9% Cu) with optional thin plating (e.g., nickel or gold) for oxidation resistance. Common forms include rolled copper foil (thickness 0.1–0.5 mm), electrodeposited copper layers, or copper wires. Material must have low oxygen content (<50 ppm) to prevent embrittlement and high thermal conductivity (~400 W/m·K).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Thickness	0.1–0.5 mm
Resistivity	≤1.68 × 10⁻⁸ Ω·m
Current Density	Up to 100 A/cm²
Thermal Conductivity	385–400 W/m·K
Operating Temperature	-50°C to +200°C
Electrical Conductivity	≥58 MS/m (100% IACS)

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

IEC 60529, ASTM B152

Parent Products

This component is used in the following industrial products

Thermoelectric Module

Solid-state device that converts electrical energy into a temperature difference (Peltier effect) or generates electricity from a temperature gradient (Seebeck effect).

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Engineering Analysis

Risks & Mitigation

Oxidation leading to increased resistance
Thermal fatigue from cyclic heating/cooling
Electromigration at high current densities
Mechanical stress from CTE mismatch with semiconductors

FMEA Triads

Trigger: Oxidation due to exposure to high temperatures or humid environments
Failure: Increased electrical resistance, reduced heat pumping capacity, eventual open circuit
Mitigation: Apply protective coatings (e.g., nickel plating), use inert gas atmospheres during assembly, ensure proper sealing of the module

Trigger: Thermal cycling stress from repeated heating and cooling
Failure: Cracking or delamination of interconnects, loss of electrical continuity
Mitigation: Use compliant bonding materials (e.g., solder with additives), design for CTE matching, implement controlled ramp rates in operation

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.05 mm thickness, ±2% electrical conductivity, flatness within 0.1 mm/m

Test Method

Four-point probe resistivity measurement, thermal cycling tests per IEC 60068-2-14, shear strength testing per JEDEC JESD22-B117

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

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Inspection readiness

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Manufacturers of Copper Interconnects

Manufacturer profiles associated with Copper Interconnects.

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Frequently Asked Questions

Why is copper used for interconnects in thermoelectric modules?