ESE Guest Seminar – “Challenges and Opportunities in Radio Frequency Power Conversion for Semiconductor Plasma Applications”

Radio frequency (RF) plasma technology is essential in modern semiconductor fabrication, enabling precise processes such as etching and deposition. As the industry advances toward increasingly complex three-dimensional structures and smaller nanoscale features, the demands on plasma-based processing continue to grow. Meeting these demands requires a new generation of RF power conversion and control systems that are robust, accurate, agile, and efficient. Key challenges include delivering precise power across wide dynamic ranges and frequencies, operating under rapidly varying load impedance conditions, maintaining high power efficiency, and incorporating advanced sensing and system analytics. These requirements reveal fundamental limitations in conventional RF power delivery systems.

This presentation offers a brief overview of key plasma processes and typical inductively and capacitively coupled plasma systems. It highlights the core RF power challenges encountered in these platforms and presents recent innovations aimed at addressing them. These include RF inverter designs that maintain high efficiency under varying load conditions, scalable power combining techniques for rapid power control, and phase switched impedance modulation (PSIM) for high-speed impedance matching and transformation. Together, these advances support the development of next generation RF power architectures that enable more capable and efficient semiconductor plasma processing systems.