[001]-oriented crystalline Potassium-Sodium Niobate thin film fabricated at low temperature for use in piezoelectric energy harvester
- Authors
- Kim, Jong-Hyun; Woo, Jong-Un; Yee, Yeon-Jeong; Kim, In-Su; Shin, Ho-Sung; Hwang, Hyun-Gyu; Kweon, Sang Hyo; Choi, Hyun-Ju; Nahm, Sahn
- Issue Date
- 30-1월-2021
- Publisher
- ELSEVIER
- Keywords
- [001]-oriented crystalline KNN thin film; Piezoelectric energy harvester; Sr2Nb3O10 nanosheet seed layer; Low-temperature deposition process
- Citation
- APPLIED SURFACE SCIENCE, v.537
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED SURFACE SCIENCE
- Volume
- 537
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/50047
- DOI
- 10.1016/j.apsusc.2020.147871
- ISSN
- 0169-4332
- Abstract
- In this study, 1.0-mu m thick crystalline (K1-xNax)NbO3 (KNN) films were deposited onto various substrates at 350 degrees 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 [001]-oriented crystalline KNN film at 350 degrees C. The [001]-oriented KNN films deposited on a SN/Ni substrate exhibited smaller epsilon(r) (278) and larger d(33) (166 pm/V) values than those of a randomly oriented crystalline KNN film. Because the output power of the PEH is generally proportional to d(33)(2)/epsilon(r), a [001]-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 mu W/mm(3) (2.9 mu W) at 1.0 M Omega 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 mu W/mm(3) with a maximum output voltage of 4.2 V, indicating its applicability as a power source of an electrochromic smart glass window.
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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