Piezoelectric Vibrational Energy Harvester Using Lead-Free Ferroelectric BiFeO

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概要

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• We have proposed that BiFeO<inf>3</inf>films are suitable for piezoelectric vibrational energy harvester (VEH) applications, because BiFeO<inf>3</inf>has high spontaneous polarization and low dielectric permittivity. We demonstrated that energy can be harvested by a micromachined VEH using a BiFeO<inf>3</inf>film deposited using a sol--gel process. A VEH with a resonant frequency of {\sim}98 Hz produced an output voltage of 1.5 V\cdotG^-1and electrical power of 2.8 μW\cdotmm^-3\cdotG^-2(\mathrm{G}=9.8 m/s²) at a load resistance of 1 M\Omega. Using the analytical model for VEH, the generalized electromechanical coupling factor was estimated to be 0.41%. These results were comparable to those of the best-performing VEHs using other piezoelectric films.

• 2013-05-25

著者

• MURAKAMI Shuichi

  Technology Research Institute of Osaka Prefecture

• Yoshimura Takeshi

  Osaka Prefecture Univ. Sakai Jpn

• Kariya Kento

  Osaka Prefecture University, Sakai 599-8531, Japan

• Fujimura Norifumi

  Osaka Prefecture University, Sakai 599-8531, Japan

• Yoshimura Takeshi

  Osaka Prefecture University, Sakai 599-8531, Japan

• Murakami Shuichi

  Technology Research Institute of Osaka Prefecture, Izumi, Osaka 594-1157, Japan

• Wakazono Keisuke

  Osaka Prefecture University, Sakai 599-8531, Japan

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