Technical: The objective of the project is to explore fundamental materials behavior in ultra-scaled low-dimensional binary/ternary phase-change chalcogenide nanostructures. Aiming at generating in-depth knowledge for developing future-generation information technologies using nanoscale phase-change systems, the project is composed of two major parts: (i) exploitation of multi-level phase transition behavior in one-dimensional chalcogenide nanowires, discovering mechanism and technology pathway towards ultra-high-density information processing in future electronic systems, and (ii) investigation of ultimate materials scalability and energy efficiency in binary/ternary chalcogenides with deeply-scaled physical dimensions. Combining multiple Co-PI's different technical expertise, the team plans to build up comprehensive understandings of phase-change phenomena in aggressively scaled materials systems using both experimental and computational approaches with strong support from industry partner. The concept of information technology based of phase-change behavior in materials is recognized as one of the most successful innovations in microelectronics industry in this decade, leading to a prospective main-stream post-silicon technology. If successful, the proposed research would bring in substantial impact in this important technology by generating largely demanded knowledge to break through the well recognized technical barriers: power-efficiency and scalability.
The research opens opportunities for graduate and undergraduate students to acquire interdisciplinary research experience in nanoscale sciences, material engineering, nanofabrication, and computational nanotechnology. The efforts broaden participation of under-represented groups in research programs at the two universities. Outreach activities comprise on-site demonstration of nanoscale scientific and engineering techniques for K-12 students in the Tech Valley of upstate New York and the greater Seattle Area. The dissemination of research results by journal publications and presentations at international conferences, and its inclusion in new curriculum development at both universities will ensure broad impacts to scientific, educational, and general public communities.
The objective of the project is to develop chemical synthesis approach for producing chalcogenide nanostructures ("nanowires") and explore the material phase-transition behavior, aiming to establish scientific base for the future-generation information technology using nanoscale low-dimensional material systems. During the project period, we conducted experimental efforts to develop process based on chemical-vapor-deposition (CVD) approach to synthesize one-dimensional (1D) chalcogenide phase-change nanostructures. In particular, the research focused on binary PCM compounds that possess potential in energy-efficiency and material scalability. We explored the fundamental behavior of phase-change at nanoscale dimensions, especially the reversible crystalline-amorphous phase-transition of 1D PCM under externally applied electrical stimulus. Additional training in material growth, material analysis, and nanofabrication tools has provided the participating student with hands-on lab experience. The conducted research has generated scientific understanding on synthesis process and material properties of low-dimensional chalcogenide nanostructures that offer unique physical, electrical, and thermal properties. While the research contributed to the advancement of knowledge in nanoscale sciences and engineering, the results could be potentially valuable in developing a new material platform for ultra-dense, low-power information storage, replacing silicon-based flash memories which are approaching its scaling limits. Nanostructure-based phase-change materials could potentially impact a range of applications in information processing and storage. The research may contribute to the realization of future-generation energy-efficient electronics and cost-effective manufacturing based on bottom-up chemical assembly.
