Nano-post image sensor, and electronic device comprising the nano-post image sensor

An image sensor comprising:

• a photodetector comprising a plurality of photodetection cells;
• and
• a color separation lens layer provided over the photodetector and configured to focus light to the plurality of photodetection cells, the color separation lens layer comprising a plurality of nano-posts spaced apart from each other in a horizontal direction by a plurality of spacer layers,
• wherein each of the plurality of nano-posts comprises a first refractive layer having a first refractive index and a cylindrical shape, and a second refractive layer having a second refractive index, and surrounding bottom and side surfaces of the first refractive layer,
• wherein the second refractive index is higher than the first refractive index,
• wherein upper surfaces of the first refractive layer, the second refractive layer, and the spacer layer are at a same level.

An electronic device comprising:

• an imaging device configured to generate an optical image by focusing light reflected from an object;
• an image sensor configured to convert the optical image into an electrical signal;
• and
• a processor configured to control the imaging device and the image sensor,
• wherein the image sensor comprises nano-posts which focus light of different spectra to at least two of a plurality of photodetection cells, and a spacer layer between the nano-posts,
• wherein each of the nano-posts comprises a first refractive layer having a first refractive index and a cylindrical shape, and a second refractive layer having a second refractive index and surrounding bottom and side surfaces of the first refractive layer,
• wherein the second refractive index is higher than the first refractive index, and
• wherein upper surfaces of the first refractive layer, the second refractive layer, and the spacer layer are at a same level.