KTN結晶を用いたエレクトレットによる非定常熱環境発電に関する研究

抄録

In the present study, we propose an electret-based unsteady thermal energy harvester using potassium tantalate niobate (KTa_1-xNb_xO₃, KTN) as a dielectric for the capacitor. By connecting in series the capacitor and an electret serving as a permanent voltage source, the capacitance change with temperature fluctuations alters the amount of induced charges thereby produces external current. By using KTN having extremelylarge temperature coefficient of permittivity together with CYTOP electret, output power of 572 nJ has been obtained from one heating cycle, which corresponds to 20 times higher output power than the previous result with BaTiO₃.