Image sensor and depth imaging system

A depth imaging system for capturing an imaging object, comprises:

• an image processor;
• an image sensor coupled with the image processor;
• a light transmitter configured to emit a beam of light invisible to human eyes toward the imaging object;
• and
• an optical lens configured to irradiate the beam of light toward the imaging object or direct light reflected by the imaging object and entered into the optical lens to the image sensor;
• wherein the image sensor is configured to receive the light reflected by the imaging object to generate a light signal, the image processor is configured to process the light signal and generate depth image data associated with the imaging object, and the image sensor comprises:
• a driving layer;
• a negative electrode layer formed in the driving layer;
• a N-region layer formed above the negative electrode layer, wherein the N-region layer includes multiple cylindrical structures formed of semiconductor materials;
• a light absorption layer formed above the N-region layer, wherein the light absorption layer is composed of a multi-layer structure including a P-region layer formed using quantum dot semiconductor materials;
• and
• a positive electrode layer formed above the light absorption layer and configured to receive incoming light signals.