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What film is applied to wafer grinding?

2026-07-15 17:16:07

In the backside thinning process of a wafer, the thin film attached to the front side of the wafer (including the active device and microstructure side) is called a backside thinning tape (BG Tape or thin film in the industry)

Its core function is to protect the integrated circuits and micro bumps on the front side of the wafer from physical scratches, contamination by grinding fluid and silicon powder particles during high mechanical stress grinding processes, while buffering mechanical stress and assisting in controlling the total thickness deviation (TTV) of the wafer.

1, (UV-Curable / UV Release)

Advantages

Shortcoming

Viscosity controllable (strong to weak switching)

UV irradiation equipment is required

Low stripping force, protecting fragile chips

relatively high cost

Less residual glue and high cleanliness

UV may affect certain photosensitive devices

Applicable to:

Convex wafers, ultra-thin wafers, vulnerable devices, and high cleanliness requirements.


2, (Thermal Release)

Advantage

Shortcoming

Peel off thoroughly and cleanly

Heating is required, which may affect the thermistor

Can automatically detach the entire surface

High temperature control requirements

Suitable for automation

Heating may introduce thermal stress

Applicable to:

In situations where temporary bonding is required, the entire surface needs to be peeled off, and UV cannot be used.

3,(Pressure Sensitive / Non-release)

Advantages

Shortcoming

Lowest cost

Fixed peeling force, non adjustable

No additional equipment required (UV/heating)

High stress during peeling

Simple process

Possible residual glue, average cleanliness

Applicable to:

Ordinary thick wafers, cost sensitive, and insensitive to peel stress.




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