The removal of photoresist is a critical step in the semiconductor manufacturing process. Photoresist is used to define various patterns and structures in the chip manufacturing process, but after the pattern is completed, this layer of photoresist needs to be completely removed for subsequent process steps. Plasma debonding machine, as an efficient and environmentally friendly dry debonding technology, has gradually become the mainstream choice in semiconductor manufacturing.
1、 Technical principles
The plasma de coating machine achieves efficient removal of photoresist through chemical reactions between high-energy plasma and photoresist. The specific process is as follows:
1. Preparation stage: Place the silicon wafer coated with photoresist in the plasma reaction chamber and evacuate the chamber to remove impurities from the air.
2. Gas introduction: Select appropriate gases (such as oxygen, argon, fluorine, etc.) to introduce into the reaction chamber based on the characteristics of the photoresist to be removed. These gases will undergo different chemical reactions in plasma.
3. Plasma generation: Ionizing gas through radio frequency (RF) power or microwave energy to form plasma. The temperature and density of the plasma can be adjusted as needed.
4. Removal process: Under the action of plasma, photoresist molecules undergo degradation, and the generated small molecule gas is extracted, ultimately achieving the removal of photoresist.
5. Post processing: After removing the photoresist, the silicon wafer may need further cleaning to ensure surface cleanliness and suitability for subsequent processes.
2、 Efficient removal mechanism
The efficient removal mechanism of plasma debonding machine is mainly based on the dual effects of physical bombardment and chemical reaction:
1. Physical bombardment: High energy ions and electrons in the plasma accelerate under the action of an electric field, bombarding the photoresist on the wafer surface with higher energy. Under the impact of high-energy particles, the chemical bonds of photoresist molecules are broken, and the molecular structure is disrupted, causing the photoresist to detach from the wafer surface.
2. Chemical reactions: Plasma also contains various active free radicals and chemical groups. These active substances undergo chemical reactions with photoresist molecules, converting them into volatile compounds. For example, oxygen radicals in oxygen plasma react with hydrocarbons in photoresist to generate volatile substances such as carbon dioxide and water. These substances can be pumped out of the reaction chamber by a vacuum pump to remove the photoresist.
3、 Equipment advantages
Compared to traditional wet de gluing processes, plasma de gluing machines have the following significant advantages:
1. Efficiency: The entire cleaning process can be completed within a few minutes, with the characteristic of high yield.
2. Environmental friendliness: The plasma de gluing machine adopts a physical de gluing method, without the need to add any chemical reagents, avoiding the problem of easily damaging the cleaning object during wet cleaning.
3. Avoid using harmful solvents such as ODS: After cleaning, it will not produce harmful pollutants and is an environmentally friendly green cleaning method.
4. Low damage: The plasma debonding machine causes minimal damage to the wafer surface and will not cause damage to the wafer itself.
5. Accurate removal: It can achieve efficient and precise removal of photoresist on the wafer surface, meeting the requirements of high-precision processes in semiconductor manufacturing.
4、 Application scenarios
Plasma debonding machines are widely used in fields such as semiconductor manufacturing, advanced packaging, MEMS devices, optoelectronic components, etc
1. Semiconductor manufacturing: used for photoresist removal, slag removal, hard mask layer removal, wafer surface pre cleaning treatment, etc. after ion implantation.
2. Advanced packaging: In processes such as 2.5D/3D integration and Flip Chip, plasma debonding machines can remove photoresist residue from through holes, improving packaging yield and reliability.
3. MEMS devices: In the manufacturing of microelectromechanical systems (MEMS) devices, plasma debonding machines can be used to remove photoresist, silicon carbide etching, dry cleaning of hard mask layers, etc.
4. Optoelectronic components: In the manufacturing of optoelectronic components, plasma debonding machines can be used to remove photoresist, clean surfaces, and improve surface adhesion.
The plasma debonding machine has become a key equipment in semiconductor manufacturing due to its high efficiency, environmental friendliness, and low damage characteristics. With the continuous development of technology, plasma debonding machines will play a greater role in more fields, providing strong support for the high-precision and high-efficiency development of semiconductor manufacturing.