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Manipulating materials at the nanometer scale is challenging, particularly if alignment with nanoscale electrodes is desired. Here, we describe a lithography-free, self-aligned nanotrench ablation (SANTA) technique to create nanoscale “trenches” in a polymer like poly(methyl methacrylate) (PMMA). The nanotrenches are self-aligned with carbon nanotube (CNT) or graphene ribbon electrodes through a simple...
We review our recent studies at the intersection of energy, nanomaterials and nanoelectronics. Through careful high-field studies of two-dimensional (2D) devices based on graphene and MoS2, we have uncovered details regarding their physical properties and band structure. We have investigated thermoelectric effects in graphene transistors and phase-change memory (PCM) elements for low-power electronics...
Power consumption and heat dissipation are significant challenges in electronics ranging from mobile devices to large data centers. A fundamental examination of energy dissipation in such contexts can lead to orders of magnitude improvements in energy efficiency. We present recent highlights from our work examining power and heat dissipation in nanoscale device geometries, at contacts or interfaces,...
Phase change memory (PCM) is a promising candidate for next-generation non-volatile data storage, though its high programming current has been a major concern. By utilizing carbon nanotubes (CNTs) and graphene as interconnects to induce phase change in ultra small regions (~20 nm) of Ge2Sb2Te5 (GST), we are able to build ultra-low power PCM devices. Normal memory operations are demonstrated with exceptionally...
In this paper, we have shown that CNT (carbon nanotubes) electrodes enable control of extremely small, ~10 nm volumes of phase change materials (e.g. GST - Ge2Sb2Te5). Reversible SET and RESET programming currents as low as 1-10 μA can be achieved, two orders of magnitude lower than state-of-the-art PCM devices.
Phase-change memory (PCM) is a promising candidate for non-volatile data storage. In this study, a key step in this area, by inducing ultra-narrow (5-10 nm) phase-change regions with individual single-wall carbon nanotube (SWNTs) heaters, and programming currents of the order 10 ??A was demonstrated. Electrical measurements of such devices show step-like increases in current (up to 15 ??A steps) that...
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