Koichi Tamai

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About

Koichi Tamai is a pioneering figure in semiconductor manufacturing, whose work has advanced plasma processing for next-generation wafer fabrication. His primary research areas include microwave-excited plasma sources, dry etching, and ashing technologies for large-diameter silicon wafers. Tamai’s most notable contribution is the development of a downflow asher incorporating a large-sized microwave plasma source with a slot antenna, designed specifically for 300-mm wafers. This innovation achieved an ashing rate of 4.5 μm/min with uniformity of ±5.1% at 250°C, addressing critical challenges in high-throughput, uniform photoresist removal. While his seminal 1999 paper has garnered 2 citations, its impact lies in laying groundwork for scalable plasma tools essential to modern chip production. Tamai’s work exemplifies the engineering precision required to transition from 200-mm to 300-mm wafer processing, a pivotal shift in the semiconductor industry. His achievements underscore a legacy of enabling reliable, high-performance plasma systems that support advanced lithography and device miniaturization.