[0 0 1]-oriented crystalline Potassium-Sodium Niobate thin film fabricated at low temperature for use in piezoelectric energy harvester

Jong Hyun Kim, Jong Un Woo, Yeon Jeong Yee, In Su Kim, Ho Sung Shin, Hyun Gyu Hwang, Sang Hyo Kweon, Hyun Ju Choi, Sahn Nahm

Research output: Contribution to journalArticle

Abstract

In this study, 1.0-μm thick crystalline (K1-xNax)NbO3 (KNN) films were deposited onto various substrates at 350 °C for use in piezoelectric energy harvesters (PEHs). A Sr2Nb3O10 (SN) nanosheet monolayer fabricated on these substrates acted as the seed-layer for the formation of a [0 0 1]-oriented crystalline KNN film at 350 °C. The [0 0 1]-oriented KNN films deposited on a SN/Ni substrate exhibited smaller εr (2 7 8) and larger d33 (166 pm/V) values than those of a randomly oriented crystalline KNN film. Because the output power of the PEH is generally proportional to d332r, a [0 0 1]-oriented KNN thin film is a good material for use in a PEH. A KNN/SN/Ni PEH shows a large output power density of 20 μW/mm3 (2.9 μW) at 1.0 MΩ based on a soft tapping motion of the finger. The KNN/SN fabricated on the Ni substrate was transferred to a flexible and transparent ITO/polyethylene naphthalate (I-PEN) substrate. The transparent KNN/SN/I-PEN PEH exhibited a promising output power density of 7.02 μW/mm3 with a maximum output voltage of 4.2 V, indicating its applicability as a power source of an electrochromic smart glass window.

Original languageEnglish
Article number147871
JournalApplied Surface Science
Volume537
DOIs
Publication statusPublished - 2021 Jan 30

Keywords

  • Low-temperature deposition process
  • Piezoelectric energy harvester
  • SrNbO nanosheet seed layer
  • [0 0 1]-oriented crystalline KNN thin film

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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