Enhanced Characterizations of rf-Magnetron Sputtered BiFeO3 Thin Film Using (Ba0.5, Sr0.5)TiO3 Buffered Layer

BiFeO3(BFO) and (Ba0.5, Sr0.5)TiO3(BST)-buffered BFO capacitors were deposited on Pt/Ti/SiO2/Si(100) substrates. The effect of the thickness of the BST buffer layer, which varied from 5 to 15 nm, and the structures and electrical properties were investigated. The structures, morphologies, and leakage currents are enhanced by the insertion of a BST buffer layer. As BST film thickness increases, the remnant polarizations (Pr) decreases and the polarization–electrical field (P-E) hysteresis curve changes. Retention properties were obtained only on BST-buffered BFO. In terms of retention behaviors, we found a more stretched exponential law dominated region during retention times with increasing BST film thickness. Attractive retention values of BST-buffered BFO are also shown. © 2011 The Electrochemical Society. [DOI: 10.1149/2.024111jes] All rights reserved.

[1]  Changhong Yang,et al.  Enhanced Piezoelectric Properties of Epitaxial W-Doped BiFeO3 Thin Films , 2010 .

[2]  Changhong Yang,et al.  Aging‐Induced Double Ferroelectric Hysteresis Loops and Asymmetric Coercivity in As‐Deposited BiFe0.95Zn0.05O3 Thin Film , 2009 .

[3]  Changhong Yang,et al.  Thickness effects of Bi3.5Nd0.5Ti3O12 buffer layers on structure and electrical properties of BiFeO3 films , 2009 .

[4]  E. Longo,et al.  Improvement of fatigue resistance on La modified BiFeO3 thin films , 2009 .

[5]  R. Katiyar,et al.  Reduced leakage current in chemical solution deposited multiferroic BiFeO3/Ba0.25Sr0.75TiO3 heterostructured thin films on platinized silicon substrates , 2008 .

[6]  Jenn–Ming Wu,et al.  Studies on forming gas annealing treated BiFeO3 thin films and capacitors , 2007 .

[7]  Chia-Ching Lee,et al.  Thickness-dependent retention behaviors and ferroelectric properties of BiFeO3 thin films on BaPbO3 electrodes , 2007 .

[8]  Jenn–Ming Wu,et al.  Effect of film thickness on interface and electric properties of BiFeO3 thin films , 2007 .

[9]  T. Ren,et al.  STUDIES ON THE RELAX BEHAVIOR OF SrBi2Ta2O9 THIN FILMS , 2006 .

[10]  Sang Yeol Lee,et al.  Fabrication of the hydrogen resistive ferroelectric film of the (Pb0.72La0.28)Ti0.93O3/Pb(Zr0.52Ti0.48)O3/(Pb0.72La0.28)Ti0.93O3 heterostructure by a pulsed laser deposition method , 2006 .

[11]  Zhenxiang Cheng,et al.  Enhanced electrical polarization and ferromagnetic moment in a multiferroic BiFeO3∕Bi3.25Sm0.75Ti2.98V0.02O12 double-layered thin film , 2006 .

[12]  Jenn–Ming Wu,et al.  Low-temperature growth and interface characterization of BiFeO3 thin films with reduced leakage current , 2005 .

[13]  Jenn–Ming Wu,et al.  Characterization of highly (110)- and (111)-oriented Pb(Zr,Ti)O3 films on BaPbO3 electrode using Ru conducting barrier , 2005 .

[14]  H. Ishiwara,et al.  Reduced Leakage Current in BiFeO3 Thin Films on Si Substrates Formed by a Chemical Solution Method , 2005 .

[15]  Junling Wang,et al.  Epitaxial BiFeO3 thin films on Si , 2004 .

[16]  B. Kang,et al.  Polarization retention in Pb(Zr0.4Ti0.6)O3 capacitors with IrO2 top electrodes , 2004 .

[17]  C. Choy,et al.  Ferroelectric properties of (Ba0.5Sr0.5)TiO3/Pb(Zr0.52Ti0.48)O3/ (Ba0.5Sr0.5)TiO3 thin films with platinum electrodes , 2003 .

[18]  R. Ramesh,et al.  Epitaxial BiFeO3 Multiferroic Thin Film Heterostructures , 2003, Science.

[19]  J. Gan,et al.  Ferroelectric properties of (117)- and (001)-oriented Bi3.25La0.75Ti3O12 polycrystalline thin films , 2002 .

[20]  B. Kang,et al.  Retention Characteristics of Bi3.25La0.75Ti3O12 Thin Films , 2002 .

[21]  W. Jo,et al.  Reverse-poling effects on charge retention in Pb(Zr,Ti)O3(001)/LaNiO3(001) heterostructures , 2000 .

[22]  C. Hwang,et al.  Dielectric and electrical properties of sputter grown (Ba,Sr)TiO3 thin films , 1999 .

[23]  Kenji Natori,et al.  Thickness dependence of the effective dielectric constant in a thin film capacitor , 1998 .

[24]  G. Sasaki,et al.  Influence of Buffer Layers on Microstructural and Ferroelectric Characteristics of Sol-Gel Derived PbZrxTi1-xO3 Thin Films , 1994 .

[25]  L. E. Cross,et al.  Effect of composition and temperature on electric fatigue of La‐doped lead zirconate titanate ceramics , 1994 .

[26]  Jun Hee Lee,et al.  Fatigue and retention in ferroelectric Y‐Ba‐Cu‐O/Pb‐Zr‐Ti‐O/Y‐Ba‐Cu‐O heterostructures , 1992 .