Effect of Various Shapes and Materials on the Generated Power for Piezoelectric Energy Harvesting System

Piezoelectric energy harvesting systems are used to convert vicinity vibrations into useful electrical energy. Effect of various shapes and materials open the gateway towards the choice of maximum power generation for the micro and nano world. Comsol Multiphysics was used to simulate the four designed shapes named as Pi, E, Rectangular and T in the size range of less than hum but greater than 1 micron. Designed shapes worked under the impact of ambient vibrations using few piezoelectric materials for the maximum power generation so that traditional power sources can be replaced with such piezoelectric energy harvester. A layer of piezoelectric material (PZT-511, AN, BaTiO3) of thickness 0.5 pm is added to the cantilever and the base material is silicon of thickness 1.5 p.m. Simulations were performed using the piezoelectric device module of Comsol Multiphysics. All three materials were studied for the all four cantilever geometries. The generated power was observed maximum as 382.5 mu W in case of the barium titanate material with rectangular shape geometry but the displacement is 0.132 mu m which is very less whereas E shape cantilever shows the maximum displacement of 0.6078 pin in case of PZT-5H, Hence rectangular shape with barium titanate material is concluded to be good for maximum power generation but the displacement factor cannot be neglected, hence the cantilever with E shape geometry is considered as the best with a generated power of 49.005 mu W and a displacement of 0.6078 mu m