My research focuses on design, fabrication, modeling and simulation of non-volatile memory devices based on chalcogenide materials. Chalcogenide materials are materials containing elements group VI in periodic table. More specifically, materials used in non-volatile memory technology include Ge-Se/S-Te, Ag-Ge-Se/S etc. The following are my most recent research topics.

Reading and Writing Circuitry Design for Chalcogenide memories:

-- Chalcogenide memories are promising alternatives for flash memory due to its fast writing speed. We focus on designing specific reading/writing circuitry for chalcogenide memories.

PSPICE and Verilog-A modeling of non-volatile memory devices.

-- In order to successfully simulate circuitry containing non-volatile memories, software models need to be built. We focuses on building PSPICE and Verilog-A model for memory devices at different levels.

Fabrication of non-volatile memory devices based on Chalcogenide materials.

-- We have successfully fabricated non-volatile memory cells based on metal doped chalcogenide glasses using vacuum evaporation method. Our current interest is to investigate solution based thin film fabrication method to simplify the fabrication process. We are also trying to understand the resistance switching process by investigating the material structural behavior upon voltage bias.

Fabrication of non-volatile memory devices based on Chalcogenide materials.

-- We have successfully fabricated non-volatile memory cells based on metal doped chalcogenide glasses using vacuum evaporation method. Our current interest is to investigate solution based thin film fabrication method to simplify the fabrication process. We are also trying to understand the resistance switching process by investigating the material structural behavior upon voltage bias.

Elastic Phases in Chalcogenides.

-- Upon changing chemical compositions, most chalcogenide glasses display three elastic phase: Floppy phase, Isostatically rigid phase and Stressed rigid phase. Isostatically rigid phase is identified by self-organization of glass network. Compositions in this phase are usually good glass formers and display unique physical properties. Elastic properties of materials are always closely related to their electrical properties, therefore, understand the material's elastic property is extremely important for electronic material applications.

Light induced effects in Chalcogenides (Light assisted aging, Photo-polymerization,Photo-conductivity in chalcogenide glasses and chalcogenide solar cells).