Patent ID: 8383445

Claim:
A method for making an image sensor, the method comprising: forming a first well and a second well in a substrate; forming a gate oxide layer including at least a first part and a second part on the substrate, the first part being associated with a first thickness, the second part being associated with a second thickness; depositing a first gate region and a second gate region on the gate oxide layer, the first gate region being associated with the first well, the second gate region being associated with the second well; and forming a third well in the substrate; wherein: the first well and the second well are associated with a CMOS; the third well is associated with a photodiode; the first gate region is located on the first part associated with the first thickness; the second gate region is located on the first part associated with the first thickness and the second part associated with the second thickness; and the first thickness and the second thickness are different.