NDLI: Phase transition, interband electronic transitions and enhanced ferroelectric properties in Mn and Sm co-doped bismuth ferrite films

Content Provider	Royal Society of Chemistry (RSC)
Author	Wei, Jie Xu, Zuo Guo, Yaxin Yang, Tiantian Liu, Yalong
Copyright Year	2016
Abstract	Mn and Sm co-doped BiFeO3 (BFO) polycrystalline films have been fabricated on F-doped SnO2 (FTO) conductive glass substrate by a chemical solution deposition method. X-ray diffraction patterns and Raman spectra both imply a coexistence of rhombohedral and tetragonal phases in Mn–Sm co-doped BFO films. Scanning Electron Microscopy (SEM) images indicate more impact morphology with greater particle size in doped films. X-ray photoelectron spectroscopy (XPS) analysis suggests that high-valence Mn ions induced by Sm-doping lead to efficient decrease in oxygen vacancies, and thus improve leakage and polarization properties. Optical spectra analysis by using a Kubelka–Munk function and corresponding XPS valence band spectra analysis reveal that the optical band gap (Eg, varied from 2.38 eV to 2.26 eV) and Fermi level (EF, varied from 1.18 eV to 1.01 eV) decrease continually with the introduction of Sm dopants, further confirming the decreased defects and vacancies in layer interfaces or grain boundaries. Consequently, larger saturation polarization and lower leakage current densities were obtained in Mn–Sm co-doped BFO films. Furthermore, possible energy band structure schematic proposed on the basis of above analysis shows that the shift in Urbach impurities energy level induced by ions dopants outsiders may be quite crucial in future photovoltaic application.
Starting Page	96563
Ending Page	96572
Page Count	10
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	6
Issue Number	99
Journal	RSC Advances
DOI	10.1039/c6ra20740e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	FTO Munk Urbach Electron Microscopy Oxygen Fermi Tetragonal crystal system Electronic band structure Crystallite Electronvolt BFO Photoemission spectroscopy Scanning electron microscope Hexagonal crystal family X-ray crystallography Solar cell Fermi level Fouday Valence and conduction bands Raman Bismuth ferrite Band gap X-ray photoelectron spectroscopy
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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