Patent ID: 8729678

Claim:
An image sensor comprising: first pixels which are formed in an active region of a semiconductor substrate and configured to measure photo-charges corresponding to incident light; second pixels which are formed in an optical-black region of the semiconductor substrate and configured to measure black levels; a deep trench which is formed substantially vertically, with respect to an upper surface of the semiconductor substrate, in a boundary region of the optical-black region; an n-type buried well which is formed substantially horizontally, with respect to the upper surface of the semiconductor substrate, in a bottom portion of the optical-black region, and is doped with n-type impurities to capture photoelectrons diffused from the active region; and a vertical contact which is formed substantially vertically from the upper surface of the semiconductor substrate to the n-type buried well, and is configured to apply a positive drain voltage to the n-type buried well, wherein the vertical contact is disposed at an end portion of the optical-black region, the end portion being disposed opposite to the boundary region, the boundary region is adjacent to the active region, and the deep trench is configured to block leakage light and diffusion carriers from the active region.