A Novel Capacitive Pressure Sensor  

一种新型电容式压力传感器(英文)

作　　者：黄晓东[1] 黄见秋[1] 秦明[1] 黄庆安[1] 

机构地区：[1]东南大学MEMS教育部重点实验室,南京210096

出　　处：《Journal of Semiconductors》2008年第3期428-432,共5页半导体学报（英文版）

基　　金：国家自然科学基金重点项目资助(批准号:90607002)~~

摘　　要：A novel capacitive pressure sensor is presented, whose sensing structure is a solid-state capacitor consisting of three square membranes with Al/SiO2/n-type silicon. It was fabricated using pn junction self-stop etching combined with adhesive bonding,and only three masks were used during the process. Sensors with side lengths of 1000,1200,and 1400μm were fabricated,showing sensitivity of 1.8,2.3, and 3.6fF/hPa over the range of 410～ 1010hPa, respectively. The sensi- tivity of the sensor with a side length of 1500μm is 4. 6fF/hPa,the nonlinearity is 6. 4% ,and the max hysteresis is 3.6%. The results show that permittivity change plays an important part in the capacitance change.提出了一种新的电容式压力传感器,传感器结构为由Al/SiO2/n-typeSi等三层方形膜构成的固态电容.传感器采用pn结自停止腐蚀和粘结剂键合的方式制造,制造过程仅需三块掩模板.对不同边长传感器进行测试,在410～1010hPa的动态范围,边长为1000,1200和1400μm的压力传感器,相应灵敏度分别为1.8,2.3和3.6fF/hPa.边长为1500μm的传感器,其灵敏度为4.6fF/hPa,全程非线性度为6.4%,最大滞回误差为3.6%.分析结果表明介电常数变化是引起电容变化的主要原因.

关 键 词：capacitive pressure senor ELECTROSTRICTION pn junction self-stop etching adhesive bonding LINEARITY 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]