Patent ID: 6586789
Filing Date: 2003-07-01
Classification: H01L

Abstract:
An image sensor pixel, comprising:a lateral photodiode element, the lateral photodiode element having a first region of a first conductive type, a third region of a first semiconductive material and a second region of a second conductive type, the third region surrounding laterally the first region, the second region substantially surrounding the third region to substantially enclose the first region, the first semiconductive material having a dopant density substantially lower than a dopant density of the first region and a dopant density of the second region; and a vertical overflow drain system coupled with the lateral photodiode element, the vertical overflow drain system having a first layer of a second semiconductive material and a second layer, the first layer separating the lateral photodiode element and the second layer, the second semiconductive material having a dopant density substantially lower than an average dopant density of the second layer and the dopant density of the first region.