| 초록 |
The high-performance flexible piezoelectric nanogenerator was demonstrated by using highly piezoelectric single crystalline PMN-PZT thin film which was grown via solid state crystal growth (SSCG) method. The flexible PMN-PZT nanogenerator successfully converted biomechanical energy into electric output up to 100 V and 20 μA. The optimization of circuit design was researched to enhance energy delivery efficiency from the flexible energy harvester to the electronic devices. From the study, we have developed a reconfigurable rectifying circuit system composed of flexible piezoelectric nanogenerator, low-loss active rectifier, and reconfigurable capacitor charger array, which enabled to transfer 4 times higher electric energy into an external load compared to a conventional rectifying circuit. Lastly, a self-powered military boot was fabricated by integration of the flexible PMN-PZT nanogenerator on the combat shoe for operating consumer portable electronics. By slight heel bending of military boot from human walking and running, the self-powered military boot generated maximum output signals of 12V and 1.2 μA, which were large enough to directly turn on a light emitting diode (LED) and liquid crystal display (LCD). |
