Photosensitive device

A photosensitive device, comprising:

• a sensing stack comprising:
• a first semiconductor layer;
• an intrinsic semiconductor layer disposed on the first semiconductor layer;
• and
• a second semiconductor layer disposed on the intrinsic semiconductor layer;
• an optical filter disposed on a side of the sensing stack and comprising high refractive films and low refractive films alternately stacked, wherein the optical filter blocks any input light having an incident angle greater than 50 degrees;
• an anti-reflective layer disposed between the sensing stack and the optical filter;
• and
• a first electrode and a second electrode connected to the sensing stack;
• wherein the total number of the high refractive films and the low refractive films is thirteen or more than thirteen.