A novel 0–3 kPa piezoresistive pressure sensor based on a shuriken-structured diaphragm

Abstract

This paper reported a novel high sensitivity and linearity 0-3 kPa piezoresistive pressure sensor by carefully trading off the stress on the beam edge and the deflection of the sensing diaphragm. A shuriken-structured diaphragm (SSD) was proposed for the first time to improve both sensitivity and linearity for the piezoresistive pressure sensor. The fabricated sensor showed a sensitivity of 4.72 mV/kPa/V and a nonlinearity of 0.18% FSO (full scale output) in the pressure range of 0-3 kPa. Compared with our previous work, the sensitivity was increased by 28.3%, while the nonlinearity was reduced by 50%.