Patent ID: 6515321
Filing Date: 2003-02-04
Classification: H01L

Abstract:
A metal-oxide semiconductor sensor, comprising:a first conductive type substrate; a second conductive type well located on the substrate; a first isolation and a second isolation located on the second conductive type well, wherein the first isolation and the second isolation define an active region; a gate having a gate layer and a gate oxide layer located within the active region on the second conductive type well, the gate layer being located on the gate oxide layer; a first spacer and a second spacer located on a first side wall and a second side wall of the gate; a first lightly doped drain region and a second lightly doped drain region under the first spacer and the second spacer in the second conductive type well, respectively, the first and second lightly doped drain regions being the first conductive type; a first source/drain region located in the second conductive type well between the first lightly doped drain region and the first isolation; a second source/drain region located between the second lightly doped drain region and the second isolation in the second conductive type well without adjacent to the second isolation, the first and the second source/drain regions being the first conductive type; a sensor implantation region located between the second source/drain region and the second isolation in the second conductive type well, the sensor implantation region being the first conductive type, wherein a depletion layer at a junction between the sensor implantation region and the second conductive type well is not in contact with the second isolation.