为什么碳化硅正在取代氧化铝成为半导体蚀刻环的材料？

半导体设备制造商每年花费数百万美元来提高等离子刻蚀性能，但一个小小的组件却能影响腔室正常运行时间、颗粒尺寸和晶圆良率——那就是刻蚀环。

高纯氧化铝一直是等离子刻蚀设备中聚焦环和边缘环的首选材料。然而，随着技术的飞速发展，对腔室部件的性能要求也在逐步提高。其目标不仅在于确保腔室的正常运行，还在于保持最大的尺寸稳定性，最大​​限度地减少颗粒物，并在整个工艺过程中维持稳定的等离子体条件。

目前，由于以下原因，碳化硅正逐渐取代氧化铝，成为半导体蚀刻环的首选材料。

过早磨损和颗粒生成

由于聚焦环安装在晶圆周围以控制等离子体分布，因此在运行过程中会长时间暴露于CF₄、NF₃、SF₆、Cl₂、BCl₃以及射频电磁场等环境中。这种暴露会持续侵蚀蚀刻环的表面，导致均匀性变化、使用寿命缩短和维护频率增加。在这种情况下，更换磨损的部件不仅会造成材料成本，而且每次维护周期都可能导致设备停机和生产中断。

材料对比

In plasma etching applications, the key difference lies not in electrical properties, but in the combined effects of hardness, thermal conductivity, and resistance to surface degradation. These characteristics directly influence the wear rate of components and the amount of contamination that may occur during use.

Four Reasons SiC Has Become a Preferred Etch Ring Material

1.SiC has a much higher hardness than aluminum oxide.

The ultra-high hardness of silicon carbide provides it with superior resistance to surface wear, enabling it to maintain its shape without deformation for a longer period of time.

2.Lower risk of particulate pollution

Silicon carbide can maintain its surface integrity more effectively under harsh processing conditions, and is therefore often used in applications where the primary goal is to reduce particle size.

3.Excellent thermal conductivity

The thermal conductivity of SiC is second only to that of aluminum nitride among these materials and is 3.5 times higher than that of alumina ceramics, enabling it to effectively stabilize component temperatures.

4.Extra long service life

In our actual processing, many customers have reported that replacing alumina with silicon carbide significantly extends the maintenance cycle of parts.

Which Type of Silicon Carbide Is Used in Etch Equipment?

It is important to understand that not all silicon carbide is the same; even alumina has different purity grades.

Reaction-Bonded Silicon Carbide (RB-SiC)

Suitable for large parts, with high mechanical strength

Sintered Silicon Carbide (SSiC)

Higher density, wear resistance and dimensional stability

CVD Silicon Carbide Coatings

High-purity silicon carbide with a dense, non-porous surface

Bulk CVD Silicon Carbide

Highest purity SiC

Selecting the Right Material

There is no universal material for every plasma-facing component.

Alumina remains a practical choice for many insulating and structural applications.

However, for focus rings and edge rings that must simultaneously deliver wear resistance, thermal stability, and long service life, silicon carbide is gradually replacing alumina in the market.

Jundro Ceramics provides custom silicon carbide machining services for semiconductor equipment manufacturers, research institutions, and advanced technology companies worldwide. Whether you require prototype development or high-precision production components, our team can support your project with reliable manufacturing solutions and fast technical assistance.