A double polycrystalline strained sige planar bicmos integrated device and its preparation method

Abstract

The invention discloses a method for preparing a dual polycrystalline strain SiGe plane bipolar complementary metal oxide semiconductor (BiCMOS) integrated device. The method comprises the following steps of: preparing a silicon-on-insulator (SOI) substrate, etching a bipolar device area on the substrate, preparing a dual polycrystalline SiGe heterojunction bipolar transistor (HBT) device in the area by using a chemical vapor deposition (CVD) method and a self-aligning process, photo-etching a metal oxide semiconductor (MOS) active area, continuously growing a Si buffer layer, a strain SiGe layer and an intrinsic layer in the area, respectively forming active areas of n-channel metal oxide semiconductor (NMOS) and p-channel metal oxide semiconductor (PMOS) devices, depositing SiO2 and polycrystalline silicon in the active areas of the NMOS and PMOS devices, etching a pseudo grid with the length of 22 to 350 nanometers, forming a light doped drain (LDD) and a source drain of the NMOS and PMOS devices by adopting the self-aligning process, then removing the pseudo grid, forming grid dielectric lanthanum oxide (La2O3) and metallic tungsten (W) for forming a grid, metalizing, photo-etching leads, and thus forming a BiCMOS integrated circuit. The self-aligning process is adopted in the preparation method, and the LDD structure is adopted in the MOS structure, so that influence of hot carriers on performance of the device is efficiently inhibited, and the reliability of the device is improved.

Description

technical field [0001] The invention belongs to the technical field of semiconductor integrated circuits, in particular to a double polycrystalline strained SiGe planar BiCMOS integrated device and a preparation method. Background technique [0002] Semiconductor integrated circuit technology is the core technology of high-tech and information industries, and has become an important symbol to measure a country's scientific and technological level, comprehensive national strength and national defense strength, while microelectronic technology represented by integrated circuits is the key to semiconductor technology. The semiconductor industry is the basic industry of the country. The reason why it develops so fast is not only the huge contribution of technology itself to economic development, but also its wide applicability. [0003] Gordon Moore, one of the founders of Intel, proposed "Moore's Law" in 1965, which states that the number of transistors on an integrated circuit...

AI Technical Summary

Problems solved by technology

For example, when the feature size is less than 100nm, due to problems such as tunneling leakage current and reliability, the traditional gate dielectric material SiO 2 Unable to meet the requirements of low power consumption; the short channel effect and narrow channel effect of nanometer devices are becoming more and more obvious, which seriously affects the device performance; traditional lithography technology cannot meet the shrinking lithography precision

Therefore, traditional Si-based process devices are increasingly difficult to meet the needs of design

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