Strain-controlled optical absorption in epitaxial ferroelectric BaTiO3 films

被引：29

作者：

Chernova, E. ^{[1
,2
]}

Pacherova, O. ^{[1
]}

Chvostova, D. ^{[1
]}

Dejneka, A. ^{[1
]}

Kocourek, T. ^{[1
]}

Jelinek, M. ^{[1
]}

Tyunina, M. ^{[1
,3
]}

机构：

[1] Acad Sci Czech Republ, Inst Phys, Prague 18221 8, Czech Republic

[2] Czech Tech Univ, Prague 16627 6, Czech Republic

[3] Univ Oulu, Microelect & Mat Phys Labs, FI-90014 Oulu, Finland

来源：

APPLIED PHYSICS LETTERS | 2015年 / 106卷 / 19期

基金：

芬兰科学院;

关键词：

THIN-FILMS; EVOLUTION;

D O I：

10.1063/1.4921083

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A lattice strain of 0.3%-1.3% is achieved in epitaxial tetragonal BaTiO3 films grown on (001)-oriented SrTiO3 single-crystal substrates. Our experimental studies of absorption spectra in the range of 0.74-9.0 eV demonstrate that epitaxy produces significant changes in the optical properties of the films compared with those of a reference polydomain BaTiO3 crystal: the absorption edge and the peak at 5 eV strongly blue-shift by 0.2-0.4 eV, the magnitude of the peak at 5 eV drops, and certain spectral features disappear, whereas the absorption peak at 8.5 eV remains unchanged. The observed behavior is attributed to ferroelectric polarization, which is enhanced by epitaxial strain in the films. Our results indicate that epitaxially induced variations of ferroelectric polarization may be used to tailor the optical properties of thin films for photonic and optoelectronic applications. (C) 2015 AIP Publishing LLC.

引用

页数：4

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