DARK CURRENT MITIGATION WITH DIFFUSION CONTROL

摘要

A photosensor device for reducing dark current is disclosed. The photosensor device includes a photon absorbing layer and two or more photosensor diffusions in said absorbing layer. The photosensor diffusions in the absorbing layer have edges of their diffusions separated in said absorbing layer by less than two minority carrier diffusion lengths. The photosensor device also includes in one embodiment one or more diffusion control junction diffusions in the absorbing layer and in proximity to the photosensor diffusions. In another embodiment the photosensor diffusions are selectively biased to operate as photosensor diodes or as diffusion impediments.

主权项

1. A photosensor device comprising:
a photon absorbing layer; at least two photosensor diffusions in said absorbing layer, said at least two photosensor diffusions in said absorbing layer having the edges of the diffusions thereof separated in said absorbing layer by less than two minority carrier diffusion lengths; and at least one diffusion control junction diffusion in said absorbing layer in proximity to two photosensor diffusions.