Inducing Chalcogenide Phase Change with Ultra-Narrow Carbon Nanotube Heaters

Abstract

Carbon nanotube (CNT) heaters with sub-5 nm diameter induce highly localized phase change in Ge2Sb2Te5 (GST) chalcogenide. A significant reduction in resistance of test structures is measured as the GST near the CNT heater crystallizes. Effective GST heating occurs at currents as low as 25 uA, significantly lower than in conventional phase change memory with metal electrodes (0.1-0.5 mA). Atomic force microscopy reveals nucleation sites associated with phase change in GST around the CNT heater. Finite element simulations confirm electrical characteristics consistent with the experiments, and reveal the current and phase distribution in GST.

References in corpus (3)

• Electrical and Thermal Transport in Metallic Single-Wall Carbon Nanotubes on Insulating Substrates
• Thermal Probing of Energy Dissipation in Current-Carrying Carbon Nanotubes
• Inducing Chalcogenide Phase Change with Ultra-Narrow Carbon Nanotube Heaters

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