Patent ID: 7816714
Filing Date: 2010-10-19
Classification: H01L

Abstract:
1. An image sensor comprising: a readout circuitry on a first substrate; an electrical junction region in the first substrate, the electrical junction region being electrically connected with the readout circuitry; an interconnection on the electrical junction region; an image sensing device on the interconnection; and a first conduction type connection region between the electrical junction region and the interconnection, wherein the electrical junction region comprises a first conduction type ion implantation region in the first substrate and a second conduction type ion implantation region on the first conduction type ion implantation region, wherein the first conduction type connection region contacts the first conduction type ion implantation region, wherein the electrical junction region provides a potential difference between a source and a drain of a transistor of the readout circuitry, wherein the transistor comprises a transfer transistor, and wherein an ion implantation concentration of the electrical junction region at the source of the transistor is lower than an ion implantation concentration of a floating diffusion region at the drain of the transistor.