Back-illuminated type solid-state imaging device
View Patent ↗A back-illuminated type solid-state imaging device is provided in which an electric field to collect a signal charge (an electron, a hole and the like, for example) is reliably generated to reduce a crosstalk. The back-illuminated type solid-state imaging device includes a structure 34 having a semiconductor film 33 on a semiconductor substrate 31 through an insulation film 32 , in which a photoelectric conversion element PD that constitutes a pixel is formed in the semiconductor substrate 31 , at least part of transistors 15, 16 , and 19 that constitute the pixel is formed in the semiconductor film 33 , and a rear surface electrode 51 to which a voltage is applied is formed on the rear surface side of the semiconductor substrate 31.
1. A back-illuminated type solid-state imaging device, comprising;
a semiconductor substrate having a front surface and a rear surface;
an insulation film formed over the front surface of the semiconductor substrate;
a semiconductor film formed over a semiconductor substrate through said insulation film, wherein a photoelectric conversion element that constitutes a pixel is formed in said semiconductor substrate; at least part of transistors that constitute said pixel is formed in said semiconductor film; a rear surface electrode to which a voltage is applied is formed on the rear surface of said semiconductor substrate; the voltage of said rear surface electrode during a light-receiving period is a voltage of a first polarity; and a charge injection preventive film is formed between said rear surface electrode and said semiconductor substrate.
2. A back-illuminated type solid-state imaging device according to claim 1 , wherein said semiconductor substrate is formed of a high resistance substrate in which depletion layers from both the front and rear surfaces are linked with the voltage applied to said rear surface electrode.
3. A back-illuminated type solid-state imaging device, comprising:
a semiconductor substrate having a front surface and a rear surface;
an insulation film formed over the front surface of the semiconductor substrate;
a semiconductor film formed over a semiconductor substrate through said insulation film, wherein a photoelectric conversion element that constitutes a pixel is formed in said semiconductor substrate; at least part of transistors that constitute said pixel is formed in said semiconductor film; and a rear surface electrode to which a voltage is applied is formed on the rear surface of said semiconductor substrate, an interface between the solid-state imaging device and a circuit substrate outside of said solid-state imaging device includes both of a bump and wire bonding to said rear surface electrode.
4. A back-illuminated type solid-state imaging device according to claim 1 , wherein a voltage of a second polarity is applied to said rear surface electrode to reset said photoelectric conversion element.
5. A back-illuminated type solid-state imaging device according to claim 1 , wherein a charge multiplication is performed in said semiconductor substrate.