Image sensor

An image sensor comprising:

• a substrate comprising a plurality of active regions;
• a device separation layer disposed in the substrate and interposed between the plurality of active regions;
• and
• a pixel separation pattern disposed in the substrate and interposed between a plurality of unit pixels,
• wherein the plurality of unit pixels comprises a first unit pixel region and a second unit pixel region spaced apart from the first unit pixel region in a first direction,
• wherein the first unit pixel region comprises a first floating diffusion region and a first transfer gate,
• wherein the second unit pixel region comprises a second floating diffusion region and a second transfer gate, and
• wherein a top surface of the device separation layer interposed between the first transfer gate and the second transfer gate is lower than a top surface of the device separation layer interposed between the first floating diffusion region and the second floating diffusion region.

An image sensor comprising:

• a substrate comprising a first surface and a second surface;
• a pixel separation pattern disposed in the substrate and interposed between a plurality of unit pixels;
• an antireflective layer disposed on the second surface of the substrate;
• a plurality of color filters and a plurality of micro-lenses disposed on the antireflective layer;
• and
• a wiring layer disposed on the first surface of the substrate,
• wherein the plurality of unit pixels comprises a first unit pixel region and a second unit pixel region adjacent to the first unit pixel region in a first direction,
• wherein the first unit pixel region and the second unit pixel region respectively comprise a first transfer gate and a second transfer gate,
• wherein the pixel separation pattern comprises:
• a first pixel separation part interposed between the first unit pixel region and the second unit pixel region;
• and
• a second pixel separation part spaced apart from the first pixel separation part in the first direction,
• wherein the second transfer gate is interposed between the first pixel separation part and the second pixel separation part, and
• wherein a top surface of the first pixel separation part is lower than a top surface of the second pixel separation part.