Patent ID: 6242768
Filing Date: 2001-06-05
Classification: H01L

Abstract:
A charge coupled device (CCD) comprising:a semiconductor substrate with a first conductive type;a photodiode with a second conductive type in the semiconductor substrate;a charge transfer channel with the second conductive type in the semiconductor substrate; anda charge transfer element including a first, a second, a third and a fourth transferring electrode with a three-level structure over the semiconductor substrate, for transferring electric charges from the photodiode to the charge transfer channel and from the charge transfer channel to a predetermined portion of the CCD, wherein the first transferring electrode is located at a first level of the three-level structure, the second and the fourth transferring electrodes are located at a second level of the three-level structure, and the third transferring electrode is located at a third level of the three-level structure, and wherein in a wire region between the photodiode and an adjacent photodiode, the second and the third transferring electrodes are not extended beyond the first transferring electrode.