Exploring optoelectronic properties and mechanisms of layered ferroelectric K4 Nb6 O17 nanocrystalline films and nanolaminas

Scientific Reports
Qinglin DengJunhao Chu

Abstract

Two-dimensional layered K4Nb6O17 (KN) was easily formed as a secondary phase caused by the volatilization of alkali metal ions, when preparing ferroelectric K x Na1-x NbO3 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 x Na1-x NbO3 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 H2 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.

References

May 15, 1987·Physical Review. B, Condensed Matter·S Adachi
Nov 2, 2004·Nature·Yasuyoshi SaitoMasaya Nakamura
Jan 5, 2013·Chemical Reviews·Mingsheng XuHongzheng Chen
Jan 15, 2014·Chemical Society Reviews·Takashi HisatomiKazunari Domen
Jan 17, 2014·Chemical Society Reviews·Jingrun RanShi Zhang Qiao
Mar 29, 2014·Chemical Society Reviews·Peng ZhangJinlong Gong
Jan 28, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Bo WengYi-Jun Xu
Aug 13, 2015·The Journal of Physical Chemistry Letters·George Volonakis, Feliciano Giustino
Oct 2, 2015·Small·Chintamani Nagesa Ramachandra Rao, Srinivasa Rao Lingampalli
Jun 17, 2016·Nature·Shi LiuAndrew M Rappe

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Methods Mentioned

BETA
X-ray
AFM
scanning electron microscopy
XRD
scanning
atomic force microscopy
PFM

Software Mentioned

VASE

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