Patent ID: 9679933
Date: 2017-06-13
CPC Classifications: G02B,H01L

Claim:
1. An image sensor, comprising: a semiconductor substrate containing a plurality of photodiodes formed therein; a patterned buffer layer disposed above the semiconductor substrate; a red (R) pixel, a green (G) pixel, a blue (B) pixel and an infrared (IR) pixel; R, G and B filters respectively disposed at the R, G and B pixels; an IR pass filter disposed at the IR pixel; and an IR filter stacked with the R, G and B filters, wherein the IR filter cuts off at least IR light with a specific wavelength, the semiconductor substrate is disposed under the R, G and B filters, the IR filter and the IR pass filter, the R, G and B filters are disposed on the IR filter, the IR filter is formed on the patterned buffer layer, and the patterned buffer layer has an opening at the IR pixel.