Patent ID: 8415725

Claim:
A back-illuminated solid-state imaging device comprising: a substrate having a back substrate surface irradiated with light and a front substrate surface on which an element, including a plurality of transistors, is formed; a light-receiving part in the substrate and including a first-conductivity-type conductive layer, the light-receiving part receiving light through the back substrate surface and having a photoelectric conversion function for received light and a charge accumulation function; a second-conductivity-type isolation layer on a side of the first-conductivity-type conductive layer of the light-receiving part in a thickness direction of the substrate; a detection transistor on the front substrate surface, the detection transistor including a second-conductivity-type electrode layer formed in the first-conductivity-type conductive layer near the front substrate surface, the detection transistor detecting an accumulated charge in the light-receiving part and having a threshold modulation function; and a reset transistor on the front substrate surface, the reset transistor including (a) a first-conductivity-type electrode layer formed in the second-conductivity-type isolation layer, (b) a portion of the second-conductivity-type isolation layer between the first-conductivity-type electrode layer and the second-conductivity-type electrode layer of the detection transistor, and (c) a portion of the first-conductivity-type conductive layer of the light-receiving part, wherein, the first-conductivity-type conductive layer of the light-receiving part in a pixel cell isolated by the second-conductivity-type isolation layer is divided by a second-conductivity-type layer into a first region and a second region, the first and second regions arranged in a thickness direction of the substrate, and the first region closer to the back substrate surface than the second region, a second first-conductivity-type electrode layer adjacent to the back substrate surface is formed in a portion of the second-conductivity-type isolation layer on a side of the first region along a direction parallel to the back substrate surface, and the back-illuminated solid-state imaging device further comprises (1) a transparent electrode on a light-incident side of the back substrate surface, to which bias voltage for developing a pinning function is applied, and (2) a memory transistor on the back substrate surface, the memory transistor including (a) the second first-conductivity-type electrode layer, (b) the first region of the light-receiving part, (c) a portion of the second-conductivity-type isolation layer between the first region of the light-receiving part and the second first-conductivity-type electrode layer, and (d) the transparent electrode serving as a gate of the memory transistor.