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2024年12月27日发(作者:xcode是免费的吗)

mems压力敏感芯片 工艺流程

英文回答:

MEMS Pressure Sensor Fabrication Process.

The fabrication of MEMS pressure sensors involves a

series of micromachining techniques that enable the

creation of miniaturized pressure-sensing devices. The

process typically consists of the following steps:

1. Substrate Preparation: A silicon wafer is used as

the substrate for the MEMS pressure sensor. The wafer is

cleaned and coated with a thin layer of silicon nitride

(Si3N4) or silicon dioxide (SiO2) to provide electrical

insulation.

2. Cavity Formation: The cavity that will house the

pressure-sensing diaphragm is created by etching the

silicon substrate using a deep reactive-ion etching (DRIE)

process. The depth and shape of the cavity are precisely

controlled to ensure optimal pressure sensitivity.

3. Diaphragm Deposition: A thin diaphragm, typically

made of silicon nitride or polysilicon, is deposited over

the cavity using chemical vapor deposition (CVD) or low-

pressure chemical vapor deposition (LPCVD). The diaphragm

acts as the pressure-sensing element, deforming under

applied pressure.

4. Electrical Contact Formation: Electrical contacts

are formed on the diaphragm and connected to the external

circuitry. The contacts are typically made of metal, such

as gold or aluminum, and are deposited using sputtering or

evaporation techniques.

5. Packaging: The MEMS pressure sensor is packaged to

provide protection from the environment and to enable

electrical connections. The packaging material is typically

ceramic or glass and is hermetically sealed to maintain the

sensor's performance in harsh conditions.

中文回答:

MEMS 压力敏感芯片工艺流程。

MEMS 压力传感器的制造涉及一系列微加工技术,这些技术可以

制造出小型化的压力传感设备。该工艺通常包括以下步骤:

1. 基板准备,使用硅晶片作为 MEMS 压力传感器的基板。将晶

片清洗并涂覆一层薄薄的氮化硅 (Si3N4) 或二氧化硅 (SiO2),以

提供电绝缘。

2. 腔体形成,通过使用深反应离子刻蚀 (DRIE) 工艺对硅基板

进行刻蚀,形成容纳压力传感膜片的腔体。精确控制腔体的深度和

形状,以确保最佳的压力灵敏度。

3. 膜片沉积,通过化学气相沉积 (CVD) 或低压化学气相沉积

(LPCVD),在腔体上沉积一层薄膜片,通常由氮化硅或多晶硅制成。

膜片充当压力传感元件,在施加压力下变形。

4. 电接触形成,在膜片上形成电接触并连接到外部电路。接触

通常由金属制成,例如金或铝,并使用溅射或蒸发技术沉积。

5. 封装,对 MEMS 压力传感器进行封装,以提供环境保护并实

现电气连接。封装材料通常为陶瓷或玻璃,并经过密封以在恶劣条

件下保持传感器的性能。


本文标签: 压力 使用 沉积 传感器