CARBON NANOTUBE BASED NONVOLATILE MEMORY DEVICES

Author(s):  
YUEGANG ZHANG
2006 ◽  
Vol 16 (04) ◽  
pp. 959-975 ◽  
Author(s):  
YUEGANG ZHANG

The technology progress and increasing high density demand have driven the nonvolatile memory devices into nanometer scale region. There is an urgent need of new materials to address the high programming voltage and current leakage problems in the current flash memory devices. As one of the most important nanomaterials with excellent mechanical and electronic properties, carbon nanotube has been explored for various nonvolatile memory applications. While earlier proposals of "bucky shuttle" memories and nanoelectromechanical memories remain as concepts due to fabrication difficulty, recent studies have experimentally demonstrated various prototypes of nonvolatile memory cells based on nanotube field-effect-transistor and discrete charge storage bits, which include nano-floating gate memory cells using metal nanocrystals, oxide-nitride-oxide memory stack, and more simpler trap-in-oxide memory devices. Despite of the very limited research results, distinct advantages of high charging efficiency at low operation voltage has been demonstrated. Single-electron charging effect has been observed in the nanotube memory device with quantum dot floating gates. The good memory performance even with primitive memory cells is attributed to the excellent electrostatic coupling of the unique one-dimensional nanotube channel with the floating gate and the control gate, which gives extraordinary charge sensibility and high current injection efficiency. Further improvement is expected on the retention time at room temperature and programming speed if the most advanced fabrication technology were used to make the nanotube based memory cells.


1996 ◽  
Vol 433 ◽  
Author(s):  
Norifumi Fujimura ◽  
Tadashi Ishida ◽  
Takeshi Yoshimura ◽  
Taichiro Ito

AbstractWe have proposed ReMnO3 (Re:rare earth) thin films, as a new candidate for nonvolatile memory devices. In this paper, we try to fabricate (0001) oriented YMnO3 films on (111)MgO, (0001)ZnO:Al/(0001) sapphire and (111)Pt/(111)MgO using rf magnetron sputtering. We succeed in obtaining (0001) epitaxial YMnO3 films on (111) MgO and (0001)ZnO:Al/(0001)sapphire substrate, and polycrystalline films on (111)Pt/(1 11)MgO for the first time. Electrical property of the bottom electrode (ZnO:Al) changes with varying the deposition condition of YMnO3 films. However, we find an optimum deposition condition of ZnO:Al film such that it functions as a bottom electrode even after YMnO3 film deposition. The dielectric properties of the epitaxial and polycrystalline YMnO3 films are almost the same. The YMnO3 films show leaky electrical properties. This may be caused by a change in the valence electron of Mn from 3+.


2007 ◽  
Vol 91 (7) ◽  
pp. 073511 ◽  
Author(s):  
Liang Chen ◽  
Yidong Xia ◽  
Xuefei Liang ◽  
Kuibo Yin ◽  
Jiang Yin ◽  
...  

2013 ◽  
Vol 706-708 ◽  
pp. 103-107
Author(s):  
Jing Hang Hu ◽  
Xue Jian Yan ◽  
Guo Dong Zhu

In recent years ferroelectric polymer-based nonvolatile memory devices have attracted much attention due to their flexibility, transparency and ease of production. However, their electrical stability is seldom studied. In this letter we report the observation of electric fatigue in metal/ferroelectric polymer/SiO2/p-Si capacitor memories, which is compared with the electric fatigue obtained from metal/ferroelectric polymer/p-Si capacitors. Our experiments indicate that the existence of SiO2 layer has greatly improved the fatigue endurance in metal/ferroelectric polymer/SiO2/p-Si capacitors. We also discuss the possible mechanism causing this improved fatigue endurance.


2001 ◽  
Vol 48 (7) ◽  
pp. 1304-1309 ◽  
Author(s):  
Wen Luh Yang ◽  
Tien Sheng Chao ◽  
Chun-Ming Cheng ◽  
Tung Ming Pan ◽  
Tan Fu Lei

2019 ◽  
Vol 34 (9) ◽  
pp. 095020
Author(s):  
Cam Phu Thi Nguyen ◽  
Tran Dinh Manh ◽  
Anh Huy Tuan Le ◽  
Donggi Shin ◽  
Youngkuk Kim ◽  
...  

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