MEMS (micro electro mechanical system) apparatus and forming method thereof

Abstract

The invention provides an MEMS (micro electro mechanical system) apparatus and a forming method thereof. The forming method comprises the following steps: providing a substrate on which a groove is formed; depositing polycrystalline silicon or an amorphous silicon layer which is used for filling the groove to realize the sealing process and cover the surface of the substrate; patterning the polycrystalline silicon or amorphous silicon layer covered on the substrate surface so as to form a pattern of a semiconductor apparatus. The invention can improve the reliability of the filling, simplify the process flow and reduce the cost.

Description

technical field [0001] The invention relates to MEMS devices and MEMS process technology, in particular to a MEMS device and a forming method thereof. Background technique [0002] With the development of MEMS (Micro-Electro-Mechanical Systems) technology, MEMS devices have been widely used, such as micro-sensors, micro-motors and other micro-devices. Compared with traditional technologies, MEMS devices have the advantages of small size, low price, and high reliability. [0003] In the manufacturing process of MEMS devices, it is often necessary to form multiple trenches on the substrate, then etch the bottom of the trenches to form cavities, and finally fill the previously formed trenches with materials such as silicon oxide for sealing. On the one hand, filling materials such as silicon oxide have poor filling properties and are relatively easily corroded by various solutions and gases, which poses a potential threat to the reliability of the device; on the other hand, wh...

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Problems solved by technology

However, this method is relatively complicated, and the cost of the ion implantation process is very high, and the uniformity of the dopant ion distribution after implantation and the implantation depth are greatly restricted.

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