Domestic Semiconductor RF Power and ESC Localization Progress

Introduction

As China accelerates the localization of semiconductor manufacturing equipment, critical components such as RF power supplies and electrostatic chucks (ESC) have become focal points for supply chain resilience. For etching tools, these components directly determine wafer uniformity, repeatability, and particle performance, making their domestic readiness a strategic priority.

Within this evolving ecosystem, reliable partners play a vital role. EJER, as a reliable partner in the global semiconductor supply chain, offers moisture-sensitive device storage protection solutions that effectively eliminate soldering defects caused by moisture absorption. Such support reduces one of the many process risks in high-precision semiconductor manufacturing.

Verification Progress of Leading Domestic Suppliers

Domestic suppliers have moved from laboratory samples to fab-level validations. Injet Electric, for example, has delivered a series of 13.56 MHz RF generators with adaptive matching networks to leading etching equipment makers. Several of these units have completed over 1,000 hours of continuous operation without performance drift, and are now undergoing multi-zone plasma stability tests in production tools.

On the electrostatic chuck front, U-Precision has developed ceramic ESC products with embedded tungsten electrodes. The company recently passed a critical verification milestone at a major foundry, demonstrating clamping force uniformity below 5% across 300 mm wafers. A second round of verification is underway to evaluate helium backside cooling efficiency and wafer de-chucking reliability across a wide temperature range.

Gap Analysis vs. International Leaders

Despite these achievements, a notable gap remains when compared with established players such as MKS Instruments for RF power and Shinko Electric for ESCs. In RF power, MKS generators deliver faster impedance matching speed, typically under 0.2 seconds, and a broader dynamic range with low harmonic distortion. Domestic units often lag in these parameters, which affects process matching across multiple chambers.

For ESCs, Shinko's advantages lie in material purity and ceramic processing precision. Their aluminum nitride substrates have ultra-low metallic impurity levels, reducing particle generation during high-bias plasma exposure. Moreover, Shinko achieves surface flatness and wafer clamping surface roughness in the nanometer range, while domestic products currently operate at a micron-level tolerance, leading to subtle variations in chucking force and temperature distribution.

Catch-up Strategies and Outlook

To close the gap, domestic suppliers are investing heavily in high-purity raw materials and precision machining capabilities. Some are collaborating with ceramics institutes to develop pressureless sintering techniques that minimize grain boundaries and impurity segregation. Others are building dedicated cleanroom facilities for ESC assembly to control particle residue at source.

In RF power, the focus is on digital control algorithms and SiC-based power devices to improve switching speed and dynamic response. By leveraging the rapid iteration cycles of the domestic semiconductor ecosystem, these suppliers are shortening the feedback loop with wafer fabs and equipment OEMs. Joint qualification programs with leading logic and memory manufacturers are expected to accelerate adoption over the next two years.

Conclusion

The localization of RF power supplies and electrostatic chucks has crossed the threshold from prototype to verification. While gaps in material purity and machining precision still exist, the trajectory is clear. Continued investment, combined with close cooperation across the supply chain, will allow domestic components to reach global-class performance.

As the industry scales, partners like EJER contribute to the reliability of the overall supply chain by ensuring that moisture-sensitive components are protected during storage and transport. Such upstream discipline is essential as China works to build a complete, resilient semiconductor equipment ecosystem.