That's not entirely true. BSI always had some metallization on the backside for aperture, power and packaging. For example, see this: https://image-sensors-worl

That's not entirely true. BSI always had some metallization on the backside for aperture, power and packaging. For example, see this: https://image-sensors-world.blogspot.com/2018/03/techinsights-publishes-samsung-09um.html https://image-sensors-world.blogspot.com/2018/03/techinsight... Perhaps what they're proposing is more sophisticated, but definitely not something entirely new.