Canon continues to put R&D into stacked sensors. This latest patent for the technology is quite detailed in its delivery.
According to Canon News:
This patent application is for suppressing the dark current and/or leakage current by using diffusion preventing films surrounding the bonding areas.
This is a very highly detailed patent application, going into a significant amount of diagrams and specifics. It stands to reason that Canon is heavily investing it’s time in and energy into stacked sensors, and these patents seem to indicate just that.
We’re all hoping for some sensor breakthroughs from Canon for the next generation of DSLRs and mirrorless cameras.