Photosensor device and method for determining incident light

A photosensor device, comprising:

• a plurality of first well structures;
• an isolation well structure, disposed at a periphery of each of the first well structures to partition the first well structures, wherein the first well structures are capable of generating a first photocurrent according to illumination of an incident light;
• and
• a plurality of second well structures, being capable of generating a second photocurrent according to the incident light, wherein a total surface area of the second well structures illuminated by the incident light is substantially equal to a total surface area of the first well structures illuminated by the incident light.

A method of determining an incident light, comprising:

• receiving the incident light by at least one first well structure to generate a first photocurrent;
• receiving the incident light by at least one second well structure to generate a second photocurrent;
• and
• obtaining a spectrum signal of the incident light according to the first photocurrent and the second photocurrent.