Patent ID: 9543349
Date: 2017-01-10
CPC Classifications: H01L

Claim:
1. A complementary metal-oxide-semiconductor (CMOS) image sensor comprising: a substrate including a pixel array and a peripheral circuit region; a photodiode and a floating diffusion region in the pixel array of the substrate; a transfer gate insulating layer and a transfer gate electrode on a portion of the substrate that is between the photodiode and the floating diffusion region; and a peripheral gate insulating layer and a peripheral gate electrode on the peripheral circuit region, wherein the transfer gate electrode includes a first edge that is rounded to have a first radius of curvature, wherein the peripheral gate electrode includes a second edge that is rounded to have a second radius of curvature shorter than the first radius of curvature, and wherein the transfer gate electrode further comprises a third edge that is rounded to have a third radius of curvature shorter than the first radius of curvature.