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High‐Performance (Na 0.5 K 0.5 )NbO 3 Thin Film Piezoelectric Energy Harvester
Author(s) -
Kim BoYun,
Seo InTae,
Lee YounSeon,
Kim JinSeong,
Nahm Sahn,
Kang ChongYun,
Yoon SeokJin,
Paik JongHoo,
Jeong YoungHun
Publication year - 2015
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13238
Subject(s) - materials science , piezoelectricity , orthorhombic crystal system , substrate (aquarium) , natural bond orbital , electrode , piezoelectric coefficient , power density , electric field , composite material , crystal structure , power (physics) , crystallography , chemistry , density functional theory , oceanography , computational chemistry , geology , physics , quantum mechanics
The pseudocubic structure of a ( Na 0.5 K 0.5 ) NbO 3 ( NKN ) film grown on a Pt / Ti / SiO 2 / 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/cm 3 .
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