High-performance (Na0.5K0.5)NbO3 thin film piezoelectric energy harvester

Bo Yun Kim, In Tae Seo, Youn Seon Lee, Jin Seong Kim, Sahn Nahm, Chong-Yun Kang, Seok Jin Yoon, Jong Hoo Paik, Young Hun Jeong

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


The pseudocubic structure of a (Na0.5K0.5)NbO3 (NKN) film grown on a Pt/Ti/SiO2/Si substrate changed to an orthorhombic structure when the film was transferred onto a polyimide substrate. Piezoelectric constant for the transferred NKN film increased considerably from 74 ± 11 to 120 ± 18 pm/V because the crystal structure of the film had changed from pseudocubic to orthorhombic. A gold interdigitated electrode was deposited onto the transferred NKN film to synthesize a NKN piezoelectric energy harvester. The NKN piezoelectric energy harvester was poled before bending under a 100 kV/cm DC electric field across the electrodes. When a strain of 0.85% and a strain rate of 4.05%/s were applied to the NKN piezoelectric energy harvester, it produced a maximum output voltage of 1.9 V and a current of 38 nA, corresponding to a power density of 2.89 μW/cm3.

Original languageEnglish
Pages (from-to)119-124
Number of pages6
JournalJournal of the American Ceramic Society
Issue number1
Publication statusPublished - 2015 Jan 1

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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