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Scaling challenges of floating gate non-volatile memory and graphene as the future flash memory device: A review

Hamzah, Afiq and Ahmad, Hilman and Tan, Michael Loong Peng and Alias, N. Ezaila and Zaharah, Johari and Razali, Ismail (2019) Scaling challenges of floating gate non-volatile memory and graphene as the future flash memory device: A review. Journal of Nanoelectronics and Optoelectronics, 14 (9). pp. 1195-1214. ISSN 1555-130X

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Official URL: http://dx.doi.org/10.1166/jno.2019.2204


With the increasing number of electronic consumer and information technology, demands for non-volatile memory rapidly grow. This study comprehensively reviewed the challenges related to the floating gate transistor for each component of the gate stack that consists of the tunnel oxide layer, inter-poly dielectric (IPD) oxide layer and poly-Si floating gate until reaching its bottleneck as the floating gate thickness scale to 7 nm. By going through the development of flash memory from its early year, the issues of the floating gate structure are identified. In resolving these issues, several approaches and upcoming flash memory devices are proposed. The prospect of carbon-based floating gate devices covering the graphene flash memory (GFM) and the vertical CNTFET floating gate are thoroughly discussed; reviewing its device performance and transient characteristics, which were extracted from experimental works and compared with recent upcoming technologies such as the HFG and the three-dimensional (3D) vertical flash memory. Reports indicate that graphene flash memory (GFM) capable of rivaling with the upcoming hybrid floating gate (HFG) device. It is found that the carrier concentration, transient characteristics and memory window of GFM are very much comparable to the HFG. Attributes to the high density of states (DOS) of graphene, GFM managed to lower its operating voltage while achieving comparable memory window as HFG. In the case of CNTFET with nanocrystal floating gate, the device performance is lesser than the 3D vertical flash memories in terms of its short channel effect and gate capacitance ratio. But considering its nanometer structure that has ballistic properties, better device performance with a proper definition of metal contact and synthesis can be achieved. Finally, the advantages of using graphene as floating gate are concluded and future work to improve the CNTFET floating gate is proposed.

Item Type:Article
Uncontrolled Keywords:Tunneling oxide, Vertical 3D flash memory
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:Electrical Engineering
ID Code:89041
Deposited By: Widya Wahid
Deposited On:26 Jan 2021 16:41
Last Modified:26 Jan 2021 16:41

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