Exploring optoelectronic properties and mechanisms of layered ferroelectric K 4 Nb 6 O 17 nanocrystalline films and nanolaminas

Two-dimensional layered K Nb O (KN) was easily formed as a secondary phase caused by the volatilization of alkali metal ions, when preparing ferroelectric K Na NbO based ceramics and films. In this work, it was believed that KN film is with weak ferroelectricity and has a little effect on the ferroe...

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Published inScientific reports Vol. 7; no. 1; p. 1883
Main Authors Deng, Qinglin, Li, Mengjiao, Wang, Junyong, Zhang, Peng, Jiang, Kai, Zhang, Jinzhong, Hu, Zhigao, Chu, Junhao
Format Journal Article
LanguageEnglish
Published England 15.05.2017
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Summary:Two-dimensional layered K Nb O (KN) was easily formed as a secondary phase caused by the volatilization of alkali metal ions, when preparing ferroelectric K Na NbO based ceramics and films. In this work, it was believed that KN film is with weak ferroelectricity and has a little effect on the ferroelectric properties of K Na NbO based films. Moreover, temperature dependent (77-500 K) dielectric functions of KN film have been firstly extracted by fitting ellipsometric spectra with the Adachi dielectric function model and a four-phase layered model. The high-frequency dielectric constant linearly increases and optical band gap slightly decreases with increasing the temperature. We also research its photoelectrochemical properties and its application in high-efficient light-induced H evolution. In addition, X-ray photoelectron spectroscopy, Raman scattering, temperature dependent transmittance and infrared reflectance spectra, and first-principles calculation were conjointly performed to further reveal the intrinsic optoelectronic features and relevant mechanisms of KN.
ISSN:2045-2322