Forming method of pressure sensor
A technology of pressure sensor and electrode layer, which is applied in the direction of fluid pressure measurement, instrument, and measurement force using capacitance changes, which can solve problems such as poor performance of pressure sensors, and achieve the effects of eliminating adverse effects, improving performance, and reducing resistivity
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[0028] As mentioned in the background, existing methods form pressure sensors with poor performance. After further analysis of the reasons, it turns out that the existing method usually adopts the furnace tube process to form the top electrode layer of the pressure sensor. However, the top electrode layer formed by the furnace tube process has relatively large internal stress and high resistivity. The top electrode layer is used as the upper plate of the chamber for sensing pressure changes (the chamber is located between the bottom electrode and the top electrode), and its internal stress is required to be as low as possible so that accurate pressure changes can be obtained. At the same time, its resistance is required As low as possible, so that better conductivity characteristics can be obtained. However, if the internal stress of the top electrode layer is large, it is easy to crack itself, making the pressure sensor invalid. Even if the top electrode layer is not cracked...
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