Patent ID: 8253200
Filing Date: 2012-08-28
Classification: H01L

Abstract:
1. An image sensor, comprising: at least one pixel transistor disposed in or on a silicon substrate, wherein the pixel transistor includes a first gate electrode and a first dielectric layer that is disposed between the first gate electrode and the silicon substrate, wherein the first dielectric layer is disposed on a first portion of the silicon substrate that is of a first conductivity type; and at least one peripheral transistor disposed in or on the silicon substrate, wherein the peripheral transistor includes a second gate electrode and a second dielectric layer that is disposed between the second gate electrode and the silicon substrate, wherein the second dielectric layer is disposed on a second portion of the silicon substrate that is of the first conductivity type, the pixel transistor having a lightly-doped drain (LDD) area disposed adjoining the first dielectric layer, wherein the LDD area comprises doped epitaxial silicon of a second conductivity type, and wherein the at least one peripheral transistor does not include an LDD area of doped epitaxial silicon.