Design and Modeling of Blue-Enhanced and Bandwidth-Extended PN Photodiode in Standard CMOS Technology

A photodiode (PD) structure based on N x N junctions is presented to enhance the responsivity in the blue region and extend the optical bandwidth. The use of subsections or multiple junctions increase the number of generated blue photo-carriers as well as the collection speed of photo-carriers at the edges of the depletion regions. An N-well/Psub PD formed of 5 × 5 subsections is designed and fabr...