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A. Badar, U. Schmid, N. Kherani:
"Analysis and modeling of a piezoelectric energy harvester stimulated by β-emitting radioisotopes";
Smart Materials and Structures, 20 (2011), S. 1 - 9.

The analysis, modeling, and validation of a piezoelectric energy harvester utilizing a radioisotope source are presented and discussed. The device employs tritiated silicon as a radioisotope source to drive the charging and actuating cycles of the piezoelectric cantilever. Tritiated silicon emits energetic β particles which lead to charge partition, creating an electrostatic force between the tritiated substrate and the piezoelectric cantilever. Due to this continuous charge-discharge procedure, vibrational cycles are generated in the piezoelectric cantilever. The energy from the piezoelectric capacitor is appropriately rectified to provide electrical power to a microelectromechanical system (MEMS) device. The modeling results have been analyzed and compared with the available experimental results, showing a very good agreement. Thus, the analytical and modeling study can be applied to optimize piezoelectric energy harvester designs.

http://dx.doi.org/10.1088/0964-1726/20/11/115019