Advances in Dielectric Materials and Electronic Devices: Processing/Analysis of Dielectrics & Piezoelectrics
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 8:00 AM
October 18, 2021
Room: B235
Location: Greater Columbus Convention Center
Session Chair: Amar Bhalla, University of Texas at San Antonio
8:00 AM
Unique [Ga, Ta]:BaTiO3 Relaxor Based On Nanoscale Dipole Engineering: Kaijie Ning1; Holly Shulman1; Walter Schulze1; Steven Tidrow1; 1Alfred University
Nanoscale dipole engineering may be a useful tool for the development of new ferroelectric relaxors for next-generation electronic devices. In this work, the unique properties of nanoscale dipolar-pair substituted [Ga, Ta]: BaTiO3 ceramics are studied based on electric, dielectric, optical and microstructural characterizations. The dielectric evolution from ferroelectric behavior to diffuse behavior to relaxor behavior occurs as dipole concentration increases. The dielectric diffuseness of dipole-pair substituted [Ga, Ta]: BaTiO3 is comparable with the typical relaxor class PMN-PT but with reduced frequency dependence. Meanwhile, the [Ga, Ta] concentration is at a low level of < 5 at%, different from the classic MPN-PT which has a large dipole concentration of around 50 at%. The new simple material model (NSMM) is applied to fundamentally understand this unique dielectric behavior of the [Ga, Ta]: BaTiO3 relaxor.
8:20 AM
Now On-Demand Only - Zinc Oxide (ZnO): Inkjet Printing and Post-Processing Evaluation for Piezoelectric Applications: Sean Garnsey1; Paul Flynn1; Bryan Gamboa1; Amar Bhalla1; Ruyan Guo1; 1ECE/ COE, University of Texas at San Antonio
Zinc Oxide (ZnO) is a well-regarded ceramic material in use for over 150 years as a pigment in paint and cosmetics. In the 1950s, ZnO was found to exhibit a high piezoelectric coefficient among other favorable optoelectronic properties (wide bandgap semiconducting behavior, optical transparency, and photoluminescence) and has since been used as a piezoelectric element in conventional electronics. The rise of additive manufacturing and printed electronics has renewed interest in ZnO as a versatile feed material for piezoelectric and optoelectronic devices. Within this study, the state of ZnO printing is reviewed, a methodology for deposition/post-processing of ZnO films is developed, and the general feasibility of in situ reactive inkjet printing of ZnO is explored. Authors: Sean Garnsey, William Flynn, Bryan Gamboa, Ruyan Guo, Ph.D., Amar Bhalla, Ph.D. University of Texas at San AntonioMultifunctional Electronic Materials & Devices Research Laboratory (MEMDRL)
8:40 AM
Electroceramics with Ferroelectric Grain Boundaries via Cold Sintering: Javier Mena-Garcia1; Sinan Dursun1; Kosuke Tsuji1; Sun Hwi Bang1; Zhongming Fan1; Arnaud Ndayishimiye1; Clive Randall1; 1Penn State University
Using cold sintering, it has been able to demonstrate that novel phases, such as polymers, can be readily incorporated into the grain boundaries of a ceramic material. Typically, grain boundaries do not have ferroelectric activity; they are more likely to be inactive amorphous dielectric glass phases. Current research aims to consider ZnO dielectric oxide grains and a new type of ferroelectric intergranular phase based on PVDF-TrFE copolymers that are both ferroelectric active. By analyzing the microstructure of the ceramic with ferroelectric grain boundaries, and engineering from its non-linear conductive electrical properties, new families of ferroelectrics could be considered for new application opportunities in energy harvesting, capacitors, and actuators on flexible substrates. These materials and low temperature processes permit the possibility of hierarchical organic-inorganic functional composites ranging from the molecular level to the nanostructured phase distributions of ferroelectric grain boundaries.
9:00 AM
Production of High Temperature 3D Printed Ceramics for Sensing Applications: Eleanore Rogenski1; Victoria Adams1; Eric MacDonald2; Matthew Mullin3; Ian Small3; Pedro Cortes1; 1Youngstown State University; 2The University of Texas at El Paso; 3NASA
Ceramic materials possess many favorable properties such as heat resistivity, low dielectric profiles, and high resistance to corrosion, which makes them attractive materials in the aerospace, automotive, microelectronic, and biomedical industries. Nowadays, ceramics can be created through a variety of different additive manufacturing processes, allowing the production of customizable and intricate geometries for high temperature applications. The present work investigates the incorporation of high temperature metallic traces such as molybdenum and antimony tin oxide on 3D printed zirconia and alumina substrates to produce embedded thermocouple sensors. A variety of overmolding design concepts have been here studied in order to entrap the metallic conductive phases and yield mechanical robust structures. The present work represents the foundation of additional studies of high temperature embedded antennas as well as low temperature co-fired ceramics.
9:20 AM
Effect of Deposition Humidity on the Properties of Solution-processed Indium Tin Oxide Films: Sivaramakrishnan Sethuraman1; Rosario Gerhardt1; 1Georgia Institute of Technology
Transparent conducting films are optically transparent and electrically conductive material, typically used as electrodes in photovoltaics that call for low resistance electrical contacts without blocking the incident light. Indium tin oxide (ITO) is the most widely used owing to its excellent optoelectronic properties and ease of deposition. Solution processing is a cost-effective approach to deposit films under ambient conditions with minimum material wastage. In this research, ITO films were deposited on soda-lime glass substrates using a sol-gel ink through spin coating. Different conditions of deposition humidity were evaluated, and the results were optimized to achieve the best electrical properties while maintaining high optical transparency and uniform surface morphology. It was observed that high humidity values affect the substrate wetting property of the ITO ink and increase the possibility of hydrolysis during deposition, resulting in the formation of non-uniform surface patterns.