Structural and Charging Stability of Metal Nanodot Memory in SiO2; First-Principles Study

Metal nanodots are promising systems for future non-volatile memory devices. However, metal-atom dissociation from metal nanodots induces serious degradation during repetitious charge injection. We study which metal nanodot is thermally stable in SiO2 and which kind of metal has large charge retenti...

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Bibliographic Details
Main Authors: Nakayama, Takashi, Yamazaki, Shota, Shiraishi, Yuto
Format: Conference Proceeding
Language:English
Online Access:Get full text
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Summary:Metal nanodots are promising systems for future non-volatile memory devices. However, metal-atom dissociation from metal nanodots induces serious degradation during repetitious charge injection. We study which metal nanodot is thermally stable in SiO2 and which kind of metal has large charge retention, using the first-principles calculations. We show that nanodots made of metal atoms with a large number of d-electrons, such as Au, are unstable. On the other hand, nanodots made of metal atoms with small number of d-electrons, such as W, have both large structural and large charge-retention stability. These features are closely related to the competition between the metal-metal, metal-Si, and metal-O interactions.
ISSN:1938-5862
1938-6737
DOI:10.1149/08602.0069ecst