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 layer on a front surface side of a semiconductor substrate with an insulation film between them;
a photoelectric conversion element that constitutes a pixel in said semiconductor substrate, the photoelectric conversion element having a charge accumulation portion;
at least some transistors that constitute said pixel in said semiconductor layer;
a semiconductor film with a conductivity type opposite to the charge accumulation portion adjacent the front surface side of the substrate under the insulating film;
a transfer transistor adjacent the front surface side of the substrate; and
a rear surface electrode to which a voltage is applied on the rear surface side of said semiconductor substrate,
wherein,
the charge accumulation portion is in the substrate under the semiconductor layer, and
the same voltage as the voltage applied to said rear surface electrode is applied to said semiconductor layer.
2. A back-illuminated type solid-state imaging device comprising:
a semiconductor layer on a front surface side of a semiconductor substrate with an insulation film between them;
a photoelectric conversion element that constitutes a pixel in said semiconductor substrate, the photoelectric conversion element having a charge accumulation portion;
at least some transistors that constitute said pixel in said semiconductor layer;
a semiconductor film with a conductivity type opposite of the charge accumulation portion adjacent the front surface side of the substrate under the insulating film;
a transfer transistor adjacent the front surface side of the substrate; and
a rear surface electrode to which a voltage is applied on the rear surface side of said semiconductor substrate,
wherein,
the charge accumulation layer is in the substrate under the semiconductor layer.
3. A back-illuminated type solid-state imaging device comprising:
a semiconductor layer on a front surface side of a semiconductor substrate with an insulation film between them,
a photoelectric conversion element that constitutes a pixel in said semiconductor substrate;
at least some transistors that constitute said pixel in said semiconductor layer;
a transfer transistor adjacent the front surface side of the substrate; and
a rear surface electrode to which a voltage is applied on the rear surface side of said semiconductor substrate,
wherein,
the transfer transistor is not over the semiconductor film.
4. A back-illuminated type solid-state imaging device comprising:
a semiconductor film on a front surface side of a semiconductor substrate with an insulation film between them;
a photoelectric conversion element that constitutes a pixel in said semiconductor substrate, the photoelectric conversion element having a charge accumulation portion;
at least some transistors that constitute said pixel in said semiconductor layer;
a transfer transistor adjacent the front surface side of the substrate; and
a rear surface electrode to which a voltage is applied on the rear surface side of said semiconductor substrate,
wherein,
said photoelectric conversion element is formed into a buried type.
5. A back-illuminated type solid-state imaging device comprising:
a semiconductor film on a front surface side of a semiconductor substrate with an insulation film between them;
a photoelectric conversion element that constitutes a pixel in said semiconductor substrate, the photoelectric conversion element having a charge accumulation portion;
at least some transistors that constitute said pixel in said semiconductor film;
a semiconductor layer having a conductivity type opposite that of the charge accumulation layer adjacent the front surface side of the substrate and under the insulating film; and
a rear surface electrode to which a voltage is applied on the rear surface side of said semiconductor substrate,
wherein,
the charge accumulation portion is under the semiconductor layer.