US Patent 11837669 Photo detector systems and methods of operating same

A dynamic photodiode may comprise a substrate comprising a first surface opposite a second surface, the substrate being of a first doping type; a substrate region disposed on the first surface, the substrate region comprising a substrate contact configured to be grounded; a first doped region disposed on the first surface, the first doped region being of the first doping type and comprising a first contact configured to receive a first voltage; a second doped region disposed on the first surface, the second doped region being of a second doping type opposite to the first doping type and comprising a second contact configured to receive a second voltage. The substrate region may surround the second doped region, the second doped region may surround the first doped region, and exposed portions of the substrate form light absorbing regions may be configured to generate electron-hole pairs in the substrate.