UNIT PIXEL OF IMAGE SENSOR AND PHOTO DETECTOR USING THE SAME

摘要

Disclosed are a photo detector capable of adjusting sensitivity and a unit pixel of an image sensor using the photo detector. The photo detector includes a light-absorbing part that absorbs light; a source and a drain that are separated from the light-absorbing part by an oxide film; a channel that is formed between the source and the drain to generate a flow of electric current between the source and the drain; and a sensitivity adjustment terminal that applies a voltage to the light-absorbing part, in which the light-absorbing part is doped with a first type impurities, the source and the drain are doped with a second type impurities, the flow of electric current in the channel is adjusted based on a change in a quantity of electric charges of the light-absorbing part according to tunneling of an electron excited by the light incident to the light-absorbing part to the source or the drain, and the voltage applied through the sensitivity adjustment terminal is adjusted to adjust a threshold voltage of the channel.

主权项

1. A sensitivity adjustment photo detector, comprising:
a light-absorbing part configured to absorbs light; a source and a drain that are separated from the light-absorbing part by an oxide film; a channel that is formed between the source and the drain and configured to generate a flow of electric current between the source and the drain; and a sensitivity adjustment terminal configured to apply a voltage to the light-absorbing part, wherein the light-absorbing part is doped with a first type impurities, and the source and the drain are doped with a second type impurities, wherein the flow of electric current in the channel is adjusted based on a change in a quantity of electric charges in the light-absorbing part according to tunneling of the electron excited by the light incident to the light-absorbing part to the source or the drain, and wherein a threshold voltage of the channel is adjusted by controlling the voltage applied through the sensitivity adjustment terminal.