Patent ID: 6818483
Filing Date: 2004-11-16
Classification: H01L

Abstract:
A method for forming an interline transfer charge coupled device, the method comprising:forming columns of pinned photodiodes in a semiconductor; and forming vertical shift registers in between each of the columns of pinned photodiodes, wherein forming each of the vertical shift registers comprises: (a) forming a first gate over the semiconductor; (b) forming a first doped region in the semiconductor and next to the first gate; (c) forming a second doped region in the semiconductor next to the first doped region; (d) forming a third doped region in the semiconductor next to the second doped region; (e) forming a second gate region over the first, the second, and the third doped regions; and (f) coupling the first gate to the second gate, wherein a first region of the semiconductor beneath the first gate creates a first electric potential, the first doped region creates a second electric potential greater than the first electric potential in a second region under the second gate region, the second doped region creates a third electric potential greater than the second electric potential in a third region under the second gate, and the third doped region creates a fourth electric potential greater than the third electric potential in a fourth region under the second gate.