Patent ID: 7105906

Claim:
A photodiode comprising: a first region of semiconductor material having a first conductivity type and a first dopant concentration; a second region having a second conductivity type and a second dopant concentration, the second region lying over and contacting the first region of semiconductor material at a first junction, the first junction forming a first depletion region, the first depletion region absorbing electromagnetic radiation that represents blue light, and generating blue electron-hole pairs in response to absorbing the electromagnetic radiation that represents blue light; and a third region having the first conductivity type, the third region lying over and contacting the second region at a second junction, the second junction forming a second depletion region, the third region having a first portion that has a first dopant concentration, and a second portion that has a second dopant concentration that is substantially greater than the first dopant concentration, the second depletion region absorbing no electromagnetic radiation that represents blue light.