Research and Development

Mentoring Graduate studentsRF Magnetron Sputtering of Oxide CeramicsInterface Engineering of Complex Perovskite Oxides

High-k dielectric, ferroelectrics/multiferroic thin films and Li-ion rechargeable batteries • Lead researcher in the areas of high-k dielectrics, resistive swtching and ferroelectrics material developments. • Proposed the idea of logic and memory devices and subsequently included as one of the clusters in Institute for functional nanomaterials research under the grants from NSF for infrastructure developments at the University of Puerto… Show more High-k dielectric, ferroelectrics/multiferroic thin films and Li-ion rechargeable batteries • Lead researcher in the areas of high-k dielectrics, resistive swtching and ferroelectrics material developments. • Proposed the idea of logic and memory devices and subsequently included as one of the clusters in Institute for functional nanomaterials research under the grants from NSF for infrastructure developments at the University of Puerto Rico. • Developed a new high-k material LaGdO3 for the gate-oxide • Involved in the development of several ferroelectric materials (BiFeO3, BaTiO3, Pb (Zr,Ti)O3 with various doping to improve the properties. • Introduced a new course on “Special Topics in Solid State Physics: Nanoelectronics for Information Technology” • Involved in the development of inexpensive, environmentally benign, and safe cathode materials for high-power Li-ion rechargeable batteries. • Supervised many graduate students in the field of Cathode materials for Li-ion batteries and materials for logic and memory devices. • Co-PI of several federally (DOE,DOD and NSF) funded projects. • Realized National and International research co-operation in the field of memories and logic devices. Show less

High-k dielectric thin film for logic and memory application; Metal organic chemical vapor deposition • Tested various Alkoxide and Amide based Precursors for MOCVD of Oxide Thin Film structures in collaboration with University of Bochum. • Realized MOCVD films of TiO2, ZrO2, HfO2, DyScO3, (Ba, Sr)TiO3, SrTa2O6 films for the high-k application with novel precursors • Closely associated with IMEC Belgium for the realization of DyScO3 thin films by… Show more High-k dielectric thin film for logic and memory application; Metal organic chemical vapor deposition • Tested various Alkoxide and Amide based Precursors for MOCVD of Oxide Thin Film structures in collaboration with University of Bochum. • Realized MOCVD films of TiO2, ZrO2, HfO2, DyScO3, (Ba, Sr)TiO3, SrTa2O6 films for the high-k application with novel precursors • Closely associated with IMEC Belgium for the realization of DyScO3 thin films by MOCVD and for the characterization • Collaborated with the MOCVD manufacturer AIXTRON on various high-k oxide researches to improve the production of oxide thin films with liquid injection MOCVD industrial production unit. • Supervised and coordinated the activities of materials scientists, students and technicians on fabricating thin films, developing electronics and software for performing experiments and analyzing data. Show less

Ferroelectric thin film by RF Magnetron sputtering and Chemical Solution Deposition• Setting up the laboratory for the thin film deposition by Chemical Solution Deposition..• Developed ferroelectric thin films of PbTiO3, BaTiO3, Pb(ZrTi)O3, (Pb, La)(ZrTi)O3by RF magnetron sputtering and chemical solution deposition.• Effect of seed layers on the perovskite crystallization and realization of high growth rate in sputtering.• Efforts were also made to improve the… Show more Ferroelectric thin film by RF Magnetron sputtering and Chemical Solution Deposition• Setting up the laboratory for the thin film deposition by Chemical Solution Deposition..• Developed ferroelectric thin films of PbTiO3, BaTiO3, Pb(ZrTi)O3, (Pb, La)(ZrTi)O3by RF magnetron sputtering and chemical solution deposition.• Effect of seed layers on the perovskite crystallization and realization of high growth rate in sputtering.• Efforts were also made to improve the deposition rate of insulating oxide material by RF-magnetron sputtering and to reduce the processing temperature. Show less

Voltage tunable dielectric properties of para-electric BaSrTIO3 is of interest in the field of microwave applications as tunable phase shifters, filters etc.• Realized the thin film deposition by Chemical Solution Deposition (CSD) in the Department of Engineering Science and Mechanics.• Prepared Ba35Sr65TiO3 thin film by CSD.• Dielectric tunability of these films were studied over wide frequency range.

Ferroelectric thin films by chemical solution deposition• Developed Pb and Ba based ferroelectric thin films with switchable electrical (polarization) properties.• Developed a new dielectric measurement technique for thin film at microwave frequencies.• Sol-gel spin coating setup for large area film coating and maintained various deposition and characterization tools.