IoT; Energy harvesting; Lead-free piezoelectric thin films

The IoT requires rethinking of traditional ways of providing power. The environment is a source of mechanical energy that could be converted into electrical energy via the direct piezoelectric effect. In order to have a reliable and sustainable energy supply for low power sensing systems in buildings, vibrational energy harvesting is being pursued. Lead based materials in a piezoelectric compliant mechanism energy harvester can provide up to 3.9 mWcm^-2g² (H.G. Yeo, 2016).