Method for regulating back gate threshold voltage of SOI-NMOS (silicon on insulator-N-channel metal oxide semiconductor) device

Abstract

The invention relates to a method for regulating back gate threshold voltage of an SOI-NMOS (silicon on insulator-N-channel metal oxide semiconductor) device. The method comprises the following steps: improving the back gate threshold voltage and lowering the back gate threshold voltage, wherein the method for improving the back gate threshold voltage comprises: grounding potential for a grid electrode, a drain electrode and a source electrode of the SOI-NMOS device; and connecting the positive direct current voltage with the absolute value greater than 80V to a back grid electrode of the SOI-NMOS device for more than 10 seconds; and the method for lowering the back gate threshold voltage comprises: grounding potential for the grid electrode, the drain electrode and the source electrode of the SOI-NMOS device; and connecting the negative direct current voltage with the absolute value greater than 80V to a back grid electrode of the SOI-NMOS device for more than 10 seconds. The threshold voltage of back grid channel start of the SOI-NMOS device is regulated, and the increase of the back gate threshold voltage and the decrease of off leakage current of the SOI-NMOS device can be realized.

Description

technical field [0001] The invention relates to the technical field of SOI CMOS semiconductor integrated circuits, in particular to a method for adjusting the back gate threshold voltage of an SOI-NMOS device. Background technique [0002] SOI (Silicon-On-Insulator) technology refers to the fabrication of devices and circuits on a silicon film on an insulating layer (BOX), which is different from the ordinary bulk silicon technology that directly manufactures devices and circuits on a semiconductor substrate. Complete dielectric isolation is achieved between devices, so SOI-CMOS integrated circuits essentially avoid the latch-up effect of bulk silicon CMOS circuits; in addition, SOI devices have small short-channel effects, can naturally form shallow junctions, and leak current Small, with excellent subthreshold characteristics. SOI-CMOS integrated circuits with no latch, high speed, low power supply voltage, low power consumption, radiation resistance and high temperature ...

AI Technical Summary

Problems solved by technology

To increase the threshold voltage of the back gate by doping the back gate channel, first of all, the range of the threshold voltage increase cannot be precisely controlled, because the doping concentration cannot be precisely controlled; in addition, this will increase the complexity of the process, increase the cost of manufacturing, and doping Miscellaneous processes (such as ion implantation) can cause damage to the device and produce other effects

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