Solid state imaging device having a plurality of signal lines for shift-register section extending over photoelectric conversion section
First Claim
1. A solid-state imaging device comprising:
- .a semiconductor substrate having a back side for receiving radiation and a front side opposite to said back side;
a radiation sensor section formed on said front side, said radiation sensor section including a plurality of photoelectric conversion regions arranged to accumulate signal charges generated by radiation;
a shift-register section formed on said front side adjacent and parallel to said radiation sensor section and including a channel formed in said front side of said substrate for receiving said signal charges from said photoelectric conversion regions of said radiation sensor section and for shifting said signal charges through said shift-register section;
an insulating layer formed on said front side to cover said radiation sensor section and said shift-register section, said insulating layer having a plurality of contact holes formed therein;
a plurality of transfer gates formed in said insulating layer for transferring said signal charges accumulated by said photoelectric conversion regions to said shift-register section;
a plurality of gate electrodes formed in said insulating layer, a selected one of said gate electrodes being arranged adjacent to each of said transfer gates for controlling said transferring of said signal charges from said photoelectric conversion regions to said shift-register section; and
a plurality of signal lines formed on said insulating layer, extending in front of and isolated from said photoelectric conversion regions, each of said signal lines being connected to an associated one of said gate electrodes through an associated one of said contact holes.
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Accused Products
Abstract
An inter-line, back-illuminated, solid state imaging device having a large active area. Metal signal lines providing driving signals to gate electrodes of vertical CCD shift-registers are disposed in front of radiation sensors. The metal signal lines can serve as metal mirrors for increasing the amount of usable radiation. At the gap portion of the metal signal lines, a second metal mirror can be provided. Alternatively, the dimension of the gap is smaller than the lowest wavelength of the band wavelength of the radiation to be detected. When a metal mirror is provided separately form the metal signal line group, the metal mirror can serve as a shield of the photoelectric conversion layer from the driving signal.
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Citations
7 Claims
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1. A solid-state imaging device comprising:
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a semiconductor substrate having a back side for receiving radiation and a front side opposite to said back side; a radiation sensor section formed on said front side, said radiation sensor section including a plurality of photoelectric conversion regions arranged to accumulate signal charges generated by radiation; a shift-register section formed on said front side adjacent and parallel to said radiation sensor section and including a channel formed in said front side of said substrate for receiving said signal charges from said photoelectric conversion regions of said radiation sensor section and for shifting said signal charges through said shift-register section; an insulating layer formed on said front side to cover said radiation sensor section and said shift-register section, said insulating layer having a plurality of contact holes formed therein; a plurality of transfer gates formed in said insulating layer for transferring said signal charges accumulated by said photoelectric conversion regions to said shift-register section; a plurality of gate electrodes formed in said insulating layer, a selected one of said gate electrodes being arranged adjacent to each of said transfer gates for controlling said transferring of said signal charges from said photoelectric conversion regions to said shift-register section; and a plurality of signal lines formed on said insulating layer, extending in front of and isolated from said photoelectric conversion regions, each of said signal lines being connected to an associated one of said gate electrodes through an associated one of said contact holes. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification