Advances in Dielectric Materials and Electronic Devices: Poster Session
Sponsored by: ACerS Electronics Division
Program Organizers: Amar Bhalla, University of Texas; Ruyan Guo, University of Texas at San Antonio; Rick Ubic, Boise State University; Matjaž Spreitzer, Jožef Stefan Institute
Monday 5:00 PM
October 10, 2022
Room: Ballroom BC
Location: David L. Lawrence Convention Center
D-1: Electrical Characterization of Vanadium and Yttrium Co-Doped BaTiO3: Andrew Aumen1; Elizabeth Dickey1; 1Carnegie Mellon University
Vanadium and Yttrium co-doping strategies for BaTiO3 have been investigated to improve reliability and lifetime of multi-layered ceramic capacitors (MLCC). Miniaturization of electronic devices requires more reliable MLCCs without sacrificing performance. Vanadium and yttrium were explored as co-dopants in BaTiO3 to reduce electronic carriers via Fermi level pinning to improve reliability. The multi-valent state of vanadium presents a greater challenge to understanding the defect structure in the material. Co-doped samples were prepared using a solution doping method and the dense disk samples were characterized using impedance spectroscopy measurements to show the effects of powder processing on the electrical properties of the material. Impedance spectroscopy data will be presented to show bulk and grain boundary resistances, as a function of temperature, to better understand how the dopants may lead to improved electrical degradation resistance. This research was funded by the Air Force Office of Scientific Research under grant FA9550-19-1-0222.
D-2: Fabrication of a Pressure Sensor Using Inkjet Printed Metal-organic Frameworks and Interdigitated Electrodes: Melinda Duong1; Sean Garnsey1; Paul Flynn1; Amar Bhalla1; Ruyan Guo1; 1University of Texas at San Antonio
The extensive material class of metal-organic frameworks (MOFs) has generated increasing interest within a broad range of applications including drug delivery, biomedicine, gas separation, and sensing. Due to tunability, polymeric composition, porosity, and biocompatibility, MOF structures offer versatility and scalable functionality. MOF UiO-66 (Hf) has been researched closely on account of possessing extraordinary properties and superior stability as well as exhibiting piezoelectric and ferroelectric responses. The advancement of additive manufacturing and printed electronics facilitated various experimental approaches in the ongoing study of MOFs. For this study, a MOF UiO-66 (Hf) functional ink and interdigitated electrodes fabricated via inkjet deposition are examined to develop a flexible pressure sensor. This study aims to evaluate the piezoelectric and ferroelectric properties of the MOF, as well as enhanced sensitivity and detection by incorporating interdigitated electrode technology. This work has been supported by the Office of Naval Research.Keywords - metal-organic framework, interdigitated electrode, inkjet printing
D-3: Nanoscale Dipole Engineering of Barium Titanate Using Dysprosium-Tantalum and Holmium-Tantalum Dipoles: Victoria Pellegrino1; Steven Tidrow1; 1Alfred University
Barium titanate, BaTiO3, as a paraelectric, stores energy through atomic polarization of atoms and as a ferroelectric through spontaneous polarization. Previously, it has been demonstrated that substitution of dilute dipole pairs for titanium ions in barium titanate can increase the materials electrical storage capacity, along with increased temperature range of operation through dielectric relaxor-like behavior. This work explores the substitution process using dysprosium-tantalum and holmium-tantalum dipoles with each dipole pair containing ions that have larger polarizabilities than the originally present titanium ions, while also keeping the material charge neutral. The substitutions are preformed using the stoichiometric equation: BaTi1-2x[B3+, Ta5+]xO3, with x = 0 to 0.0500, and the B-site, B, being dysprosium or holmium ions, respectively. Resulting material properties, including some (relative permittivity, resistivity, and Raman spectroscopy) temperature dependent, are reported as a function of dipole concentration.
D-4: Neural Network Design for Video Based Automation of Drop-on-Demand Inkjet Drop Formation Optimization: Maximilian Estrada1; Ruyan Guo1; Amar Bhalla1; Sean Garnsey1; Paul Flynn1; Wasim Dipon1; Matthew Trippy1; Melinda Duong1; Carlos Acosta1; Bryan Gamboa1; 1Max Estrada
Additive manufacturing has applications in medicine, electronics, transportation, and education—just to name a few. One of the main advantages of additive manufacturing is that it provides an inexpensive, rapid prototyping solution. There is, currently, much interest in using drop-on-demand (DOD) inkjet printing to explore functional material applications. Each novel ink possesses its own DOD drop ejection behavior—associated with the ink’s rheological properties. Currently, printhead voltage profiles are adjusted, manually, to compensate for these differences. An RDC network with custom basis functions is explored as a means of vision-based automation of printhead voltage profile optimization with respect to drop quality.
D-5: Structural and Dielectric Properties Relationship in Strontium-Tantalum Based Oxide Ceramics for DRA Applications: Matthew Julian1; Mouad Barzani1; Mohamad Haydoura1; Ratiba Benzerga1; Laurent Le Gendre1; Ala Sharaiha1; Francois Chevire2; Claire Le Paven1; 1Université de Rennes, CNRS, IETR-UMR 6164, F-35000 Rennes, France; 2Université de Rennes, CNRS, ISCR-UMR 6226, F-35000 Rennes, France
This presentation exhibits the work to fabricate high density strontium-tantalum based oxide ceramics for integration into miniaturized dielectric resonator antennas (DRA) applicable for use in 5G devices. The effect of various sintering conditions on the microstructure, relative density and phase purity are investigated. Through these optimizations, the relative density of (Sr,La)2(Ta,Ti)2O7 and β’-SrTa2O6 ceramics have been increased from ~ 80% up to 94%. These characteristics are coupled with low frequency dielectric measurements of the permittivity and losses, conducted via a metal-insulator-metal structure. Results of high frequency measurements performed within a resonant cavity around 3.5 GHz are also presented. The results demonstrate that optimal processing conditions to attain high relative density strontium-tantalum based ceramics improve the dielectric performance and suitability for 5G DRA applications.
D-6: Synthesis of BT-BNT and BT-BNTN Relaxors by 2D Nanosheets Wrapping Methods: Taeyeong Song1; Hanwool Kim1; Do-Kyun Kwon1; 1Korea Aerospace University
One effective way for the BaTiO3 ferroelectric ceramics to exhibit stable dielectric polarizations persisting over a wide temperature range can be found in forming complex perovskite compounds by heterovalent cation substitutions. (1-x)BaTiO3-x(Bi,Na)TiO3 and (1-x)BaTiO3-x(Bi,Na)(Ti1-yNby)O3 solid solutions were synthesized using a newly developed "wrapping process", which is a 2-D nanosheet-based process for preparing core-shell type assembly of BT nanoparticles and BNT/BNTN nanosheets mixtures. Since the solid solution formations from the mixtures can be described as a diffusion-controlled process, it could provide a plausible circumstance to maximize the contact area to secure high level reactivity within the heterogeneous substances. The core-shell type configurations were responsible for the accelerated sintering behaviors without excessive grain growth. The sintered samples showed relaxor characteristics with high dielectric permittivity and energy density. Further improvements in temperature stability of dielectric properties to satisfy the X8R and X9R specifications were achieved by Nb doped BNT (BNTN) nanosheets wrapping.