Gate Stack Engineering for Emerging Polarization based Non-volatile Memories

Autor: Milan Pesic

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The hafnium based ferroelectric memories offer a low power consumption, ultra-fast operation, non-vo...

Informații despre carte

Autor

Milan Pesic

Limbă

engleză

Legare

Carte - Carte broșată

Publicat

2017

Pagini

154

EAN

9783744867887

ISBN

3744867889

Enbook ID

16800194

Editura

Books on Demand

Greutate

191

Dimensiuni

148 x 210 x 8

Descriere completă

The hafnium based ferroelectric memories offer a low power consumption, ultra-fast operation, non-volatile retention as well as the small relative cell size as the main requirements for future memories. These remarkable properties of ferroelectric memories make them promising candidates for non-volatile memories that would bridge the speed gap between fast logic and slow off-chip, long term storage. Even though the retention of hafnia based ferroelectric memories can be extrapolated to a ten-year specification target, they suffer from a rather limited endurance. Therefore, this work targets relating the field cycling behavior of hafnia based ferroelectric memories to the physical mechanisms taking place within the film stack. Establishing a correlation between the performance of the device and underlying physical mechanisms is the first step toward understanding the device and engineering guidelines for novel, superior devices. In the frame of this work, an in-depth ferroelectric and dielectric characterization, analysis and TEM study was combined with comprehensive modeling approach. Drift and diffusion based vacancy redistribution was found as the main cause for the phase transformation and consequent increase of the remnant polarization, while domain pinning and defect generation is identified to be responsible for the device fatigue. Finally, based on Landau theory, a simple way to utilize the high endurance strength of anti-ferroelectric (AFE) materials and achieve non-volatility in state-of-the-art DRAM stacks was proposed and the fabrication of the world's first non-volatile AFE-RAM is reported. These findings represent an important milestone and pave the way toward a commercialization of (anti)ferroelectric non-volatile memories based on simple binary-oxides.

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Gate Stack Engineering for Emerging Polarization based Non-volatile Memories

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