Masaharu Kobayashi

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About

Masaharu Kobayashi is a leading figure in advanced semiconductor device engineering, with a primary focus on three-dimensional (3D) integration and stacked CMOS image sensor technology. His pioneering work centers on overcoming the fundamental interconnect bottlenecks in modern imaging systems by developing multi-layer, pixel-parallel architectures. Kobayashi’s major contribution is the first-ever demonstration of three-layer stacked CMOS image sensors, achieved through an innovative double-sided hybrid bonding technique using silicon-on-insulator (SOI) wafers. By embedding damascened Au electrodes within SiO₂ insulators on both the front and back sides of the wafers, his team enabled simultaneous face-to-face and face-to-back bonding, a critical breakthrough for realizing high-density, vertically integrated circuits. This work, published in 2023, has already garnered 9 citations, signaling its rapid impact on the field of 3D heterogeneous integration. His 2022 study, with 4 citations, laid the foundational process for this multi-layer stacking capability. Kobayashi’s research is instrumental for next-generation high-speed, low-power image sensors and 3D logic-memory stacks, making him a key innovator in the future of semiconductor packaging and smart imaging systems.