Whether Semiconductor Industry Requires High-Temperature resistance Materials or not?

Whether Semiconductor Industry Requires High-Temperature resistance Materials or not?

The semiconductor industry relies on high-temperature resistance materials due to extreme manufacturing conditions.

Key Reasons:

High-Temperature Processes – Wafer bonding (300–1000°C), thin-film deposition (CVD/PVD), and die-attach sintering (200–400°C) demand heat-resistant materials.

Critical Applications – Used in bonding fixtures, encapsulation, and temporary bonding for 3D ICs.

Material Requirements – Must withstand high temperatures, resist chemical corrosion, and match thermal expansion with silicon.

Common Materials:

Ceramics (Al₂O₃, AlN)

Metal Alloys (Inconel, Molybdenum)

Polymers (Polyimide, PTFE)

In semiconductor industry especially in packaging, cushion pads, steel plates, release films, and carrier trays play critical roles as auxiliary materials, ensuring precision, efficiency, and reliability in the assembly process. Below is their functional breakdown:

1.Cushion Pads

Function: Absorb pressure and distribute stress evenly to protect fragile components (e.g., chips, wafers) from mechanical damage.

Applications:

Thermo-Compression Bonding (TCB): Prevents localized stress and cracks during chip-substrate bonding.

Dicing/Grinding: Attached to wafer backsides to reduce vibration and chipping.

Materials: High-temperature-resistant silicone or polyurethane (PU), offering elasticity and chemical resistance.

2.Press Steel  Plates

Function: Provide mechanical support to prevent warping or deformation of substrates (e.g., PCBs, flexible circuits) during high-pressure or high-temperature processes.

Applications:

BGA/CSP Packaging: Enhances substrate rigidity, ensuring coplanarity of solder ball arrays.

Molding: Maintains substrate flatness during epoxy encapsulation, preventing resin bleed or uneven thickness.

Materials: Stainless steel or alloys with high stiffness and matched CTE (Coefficient of Thermal Expansion).

3.Release Films

Function: Act as temporary barriers to prevent material adhesion, enabling clean separation post-process.

Applications:

Molding: Covers mold surfaces to prevent epoxy resin from sticking, simplifying cleanup.

Temporary Bonding: Used in wafer-level packaging for temporary carrier wafer attachment and release.

Materials: Polyimide (PI) or fluoropolymer films (e.g., PTFE), offering heat resistance and smooth surfaces.

4.Carrier Trays/Plates

Function: Securely hold and position chips or substrates for precise handling and transport.

Applications:

Die Attach: Ensures accurate chip placement on substrates.

Reflow Soldering: High-temperature-resistant trays (e.g., ceramic) stabilize devices during soldering.

Materials: Metal (aluminum, copper) or ceramic (AlN), selected for thermal conductivity and stability.

Collaborative Workflow Example (Die Attachment Process)

1.Carrier trays secure the substrate while stiffener plates reinforce rigidity.

2.Cushion pads distribute pressure evenly during thermo-compression bonding.

3.Release films enable easy mold release after encapsulation, minimizing residue.

Industry Trends

Thinner Packaging: Demands ultra-thin cushion pads and release films with uniform properties.

High-Temperature Processes: Materials must withstand extreme conditions (e.g., >250°C for SiC/GaN device sintering).

Conclusion: Though not part of the electrical circuitry, these materials are indispensable for packaging yield, efficiency, and long-term reliability.