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Title: Two-bit multi-level phase change random access memory with a triple phase change material stack structure
Authors: Gyanathan, A.
Yeo, Y.-C. 
Issue Date: 15-Nov-2012
Citation: Gyanathan, A., Yeo, Y.-C. (2012-11-15). Two-bit multi-level phase change random access memory with a triple phase change material stack structure. Journal of Applied Physics 112 (10) : -. ScholarBank@NUS Repository.
Abstract: This work demonstrates a novel two-bit multi-level device structure comprising three phase change material (PCM) layers, separated by SiN thermal barrier layers. This triple PCM stack consisted of (from bottom to top), Ge 2Sb2Te5 (GST), an ultrathin SiN barrier, nitrogen-doped GST, another ultrathin SiN barrier, and Ag0.5In 0.5Sb3Te6. The PCM layers can selectively amorphize to form 4 different resistance levels (00, 01, 10, and 11) using respective voltage pulses. Electrical characterization was extensively performed on these devices. Thermal analysis was also done to understand the physics behind the phase changing characteristics of the two-bit memory devices. The melting and crystallization temperatures of the PCMs play important roles in the power consumption of the multi-level devices. The electrical resistivities and thermal conductivities of the PCMs and the SiN thermal barrier are also crucial factors contributing to the phase changing behaviour of the PCMs in the two-bit multi-level PCRAM device. © 2012 American Institute of Physics.
Source Title: Journal of Applied Physics
ISSN: 00218979
DOI: 10.1063/1.4765742
Appears in Collections:Staff Publications

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