A study of the memory effects of metallic core-metal oxide shell nanocrystals by a micelle dipping technique

作者：Kim Chung Jin; Choi Sung Jin; Ryu Seong Wan; Kim Sungho; Chang Jae Joon; Bae Su Hak; Sohn Byeong Hyeok; Choi Yang Kyu^*

来源：Nanotechnology, 2010, 21(12): 125202.

DOI：10.1088/0957-4484/21/12/125202

With a simple and conformal metal nanocrystal dipping of synthesized micelles, nonvolatile memory characteristics originating from a metallic cobalt (Co) core nanocrystal (NC) surrounded by a Co-oxide shell are investigated in this study. From transmission electron microscopy (TEM) and x-ray photoelectron spectroscopy (XPS), it was confirmed that Co-oxide was made by oxygen plasma for polymer oxidation and that metallic Co wrapped with a Co-oxide shell was made by hydrogen annealing in order to reduce the Co-oxide. Energy band diagrams considering the extent of the coexistent metallic Co/Co-oxide were also analyzed in terms of how they correspond to each program/erase/retention case. These cases were verified by electrically measured data. These results can provide a guideline for the design and optimization of metal NC embedded memory.

• 出版日期2010-3-26