Effects of LaNiO₃ interlayer on the microstructures and electrical properties of Ba_0.9Sr_0.1Ti_0.99Mn_0.01O₃ multilayer

Abstract

The aim of this work was to investigate the effects of low-resistivity interlayer on the physical properties of periodic Ba_0.9Sr_0.1Ti_0.99Mn_0.01O₃ (BSTM) multilayers prepared by a chemical solution deposition method. A LaNiO₃ (LNO) layer was inserted into the periodic BSTM multilayer artificially to form a sandwiched configuration of BSTM/LNO/BSTM. The capacitances at low frequencies (<100 kHz) of the sandwiched multilayer are significantly enhanced compared to that of the pure BSTM multilayer. The space charge accumulated at the LNO layer was proposed to explain the enhancement based on Maxwell-Wagner (M-W) model. However, LNO interlayer leads to an increase in the leakage current. A non-Ohmic conduction region is observed for BSTM/LNO/BSTM multilayer when the electric field exceeds 100 kV/cm. The results offer a new approach to achieve dielectric films with high dielectric constant.

Keywords

BSTM / multilayers / LNO / M-W model

References

[1] Dawber M, Rabe KM, Scott JF. Physics of Thin-film Ferroelectric Oxides[J]. Rev. Mod. Phys., 2005, 77: 1083-1130.

[2] Scott JF. Applications of Modern Ferroelectrics[J]. Science, 2004, 315: 954-959.

[3] Setter N, Damjanovic D, Eng L, Fox G. Ferroelectric Thin Film: Review of Materials, Properties and Applications[J]. J. Appl. Phys., 2006, 100: 051606.

[4] Muralt P. Ferroelectric Thin Films for Micro-sensors and Actuators: a Review [J]. J. Micromech. Microeng., 2000, 10: 136-146.

[5] Wang XD, Wang P, Wang JL, et al. Ultrasensitive and Broadband MoS2 Photodetector Driven by Ferroelectrics[J]. Adv. Mater., 2015, 27: 6575-6581.

[6] Kawae T, Terauchi Y, Tsuda H, et al. Improved Leakage and Ferroelectric Properties of Mn and Ti Codoped BiFeO₃ Thin Films[J]. Appl. Phys. Lett., 2009, 94: 112904.

[7] Song LR, Chen Y, Wang GS, et al. Dielectric Properties of La/Mn Codoped Ba_0.63Sr_0.37TiO₃ Thin Films Prepared by RF Magnetron Sputtering [J]. Ceram. Int., 2014, 40: 12573-12577.

[8] Silva JPB, Sekhar KC, Almeida A, et al. Effects of Pt Bottom Electrode Texture Selection on the Tetragonality and Physical Properties of Ba_0.8Sr_0.2TiO₃ Thin Films Produced by Pulsed Laser Deposited[J]. J. Appl. Phys., 2012, 112: 044105.

[9] Abazari M, Safari A, Bharadwaja SSN, Trolier-Mckinstry S. Dielectric and Piezoelectric Properties of Lead-free (Bi, Na)TiO₃-based Thin Films [J]. Appl. Phys. Lett., 2010, 96: 082903.

[10] Wu YY, Zhang DM, Yu J, et al. The Effect of Deposition Temperature and Postanneal on the Bi_3.63Pr_0.3Ti₃O₁₂ Thin Films Prepared by RFMagnetron Sputtering Method[J]. J. Am. Ceram. Soc., 2009, 92: 501-505.

[11] Huang L, Mao W, Huang ZX, et al. Influence of Annealing Time on the Microstructure and Properties of Pb(Zr_0.53Ti_0.47)O₃ Thin Films [J]. J. Wuhan. Univer. Technol-Mater. Sci. Ed., 2012, 27: 88-91.

[12] Li ML, Li J, Chen LQ, et al. Effects of Strain and Oxygen Vacancies on the Ferroelectric and Antiferrodistortive Distortions in PbTiO₃/SrTiO₃ Superlattice[J]. Phys. Rev. B, 2015, 92: 115435.

[13] Panomsuwan G, Takai O, Saito N. Epitaxial Growth of (111)-oriented BaTiO₃/SrTiO₃ Perovskite Superlattices on Pt (111)/Ti/Al₂O₃ (0001) Substrates[J]. Appl. Phys. Lett., 2013, 103: 112902.

[14] Kesim MT, Cole MW, Zhang J, et al. Tailoring Dielectric Properties of Ferroelectric-dielectric Multilayers[J]. Appl. Phys. Lett., 2014, 104: 022901.

[15] Yu SH, Li LX, Zhang WF, et al. Investigation on Tunable Performance of BMN/BST Multilayer and BMN-BST Composite Thin Films[J]. J. Am. Ceram. Soc., 2015, 98: 819-823.

[16] Wang JY, Zhang TJ, Qu SH, et al. Upconversion Luminescence Properties and Mechanism of Er³⁺ Doped Ba_0.65Sr_0.35TiO₃ Ferroelectric Oxide Nanocrystals[J]. J. Wuhan. Univer. Technol-Mater. Sci. Ed., 2015, 30: 241-244.

[17] Hong XK, Hou HH, Zhang DB. Microstructures and Optical Properties of Sol-gel Derived Ba_0.9Sr_0.1TiO₃ Thin Films Formed by Different Annealing Process[J]. J. Wuhan. Univer. Technol: Mater. Sci. Ed., 2012, 27: 1020-1023.

[18] Hong XK, Liu YS, Zhang DB, et al. Microstructures and Electrical Properties of Ba_0.9Sr_0.1Ti_0.99Mn_0.01O₃ Multilayers[J]. J. Alloys Comp., 2014, 613: 244-248.

[19] Meng XJ, Cheng JG, Sun JL, et al. Growth of (100)-oriented LaNiO₃ Thin Films Directly on Si Substrates by a Simple Metalorganic Decomposition Technique for the Highly Oriented PZT Thin Film[J]. J. Crys. Grow., 2000, 220: 100-104.

[20] O’Neil D, Bowman RM, Gregg JM. Dielectric Enhancement and Maxwell-Wagner Effects in Ferroelectric Superlattice Structures[J]. Appl. Phys. Lett., 2000, 77: 1520-1522.

[21] Jiang H, Hong LG, Venkatasubramanian N, et al. The Relationship between Chemical Structure and Dielectric Properties of Plasmaenhanced Chemical Vapor Deposited Polymer Thin Films[J]. Thin Solid films, 2007, 515: 3513-3520.

[22] Zhong XL, Wang JB, Yang SX, et al. Dependence of Excess Bismuth Content in Precursor Sols on Ferroelectric and Dielectric Properties of Bi_3.25La_0.75Ti₃O₁₂ Thin Films Fabricated by Chemical Solution Deposition[J]. Appl. Surf. Sci., 2006, 253: 417-420.