Image sensor

An image sensor, comprising:

• a substrate having a first surface;
• a first device isolation region in the substrate and adjacent to the first surface of the substrate, the first device isolation region defining a unit pixel;
• a sub-isolation region on the unit pixel in the substrate, the sub-isolation region being spaced apart from the first device isolation region and separating the unit pixel into a first sub-pixel and a second sub-pixel;
• a first sub-transfer gate on the first surface of the substrate, adjacent to a first corner of the first sub-pixel, the first corner of the first sub-pixel being adjacent to the second sub-pixel;
• a second sub-transfer gate on the first surface of the substrate, adjacent to a second corner of the second sub-pixel, the second corner of the second sub-pixel being adjacent to the first sub-transfer gate;
• and
• a floating diffusion region in the substrate and adjacent to the first sub-transfer gate and the second sub-transfer gate,
• wherein the first device isolation region and the sub-isolation region are spaced apart from the floating diffusion region.

An image sensor, comprising:

• a substrate having a first surface;
• a first device isolation region in the substrate and adjacent to the first surface of the substrate;
• and
• a first floating diffusion region and a second floating diffusion region spaced apart from each other in the substrate, the first and second floating diffusion regions being adjacent to the first surface of the substrate,
• wherein the first device isolation region defines first to fourth unit pixels adjacent to each other arranged in a counterclockwise direction in plan view,
• wherein the first floating diffusion region is positioned on a boundary between the first unit pixel and the second unit pixel,
• wherein the second floating diffusion region is positioned on a boundary between the third unit pixel and the fourth unit pixel,
• wherein the first and second floating diffusion regions are electrically connected to each other, and
• wherein the first device isolation region is spaced apart from the first and second floating diffusion regions.