Phase change memory based on SnSe4 alloy
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Date
2013-01-01
Authors
Karanja, J. M.
Karimi, P. M.
Njoroge, W. K.
Wamwangi, D. M.
Journal Title
Journal ISSN
Volume Title
Publisher
Thin Solid Films
Abstract
A phase change alloy has been synthesized and characterized. The reversible phase transitions between amorphous and crystalline states of SnSe4 films have been studied using variable electrical pulses and X-ray diffraction. Temperature dependent sheet resistance measurements have shown two distinct resistivity states of more than two orders of magnitude. This high electrical contrast makes the alloy suitable for nonvolatile phase change memory applications. X-ray diffraction has attributed the large electrical contrast to an amorphous–crystalline phase transition. The nonvolatile memory cells have been fabricated using a simple sandwich structure (metal/chalcogenide thin film/metal). A threshold voltage of 3.71 V has been determined for this phase change random access memory cell. Memory switching was initiated using the voltage pulses of 3.71 V, 90 ns, 1.3 V and 26 μs, for the crystallization and amorphization process, respectively.
Description
Keywords
Phase change, Chalcogenides, Random access memory, Tin selenide
Citation
Thin Solid Films Volume 527, 1 January 2013, Pages 323–326