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G-ReRAM scientists succeeded to decode new processes in oxide-based ReRAM cells

Modification of the interfaces can significantly influence the behaviour of VCM-type ReRAM cells. If graphene is deposited at the Ta/TaOx interface the device Ta/G/TaOx/Pt shows a transition from VCM to ECM mode. Responsible for the observed phenomena is the mobility of the Ta-ions, that also contribute to the resistive switching. To this surprising result come the G-ReRAM scientists. Ta can also form metallic filaments or Ta-ions can enrich TaOx matrix acting as donors (that are more effective than the oxygen vacancies). Atomic switches, based on cation movement was demonstrated by STM experiment with TaOx, TiOx and HfOx.

Graphene, and also thin layers of amorphous carbon suppress the oxygen reaction and formation of TaOx at the Ta/TaOx interface. In this way only the ECM mode of switching can be clearly observed. Without the barrier layer VCM and ECM co-exist.

For first time redox peaks in VCM systems are reported, thus verifying the electrochemical nature of the resistive switching. The effects of moisture on the resistive switching in VCM cells is demonstrated.

The original papers can be found in:

Nature Nanotechnology: http://www.nature.com/nnano/journal/vaop/ncurrent/full/nnano.2015.221.html

Advanced Materials: http://onlinelibrary.wiley.com/doi/10.1002/adma.201502574/full

Ilia Valov presented to invited talks on ReRAM
 
Panagiotis Dimitrakis presented an invited talk on NC-NVMs
and has an oral talk on Charge-trapping NVM with Graphene oxide as storage nodes

G-ReRAM Workshop Abstract submission is OPEN

Dr Dr Ilia Valov is a keynote speaker at ECS 2014 held in Cancun October 5-9, 2014
(https://ecs.confex.com/ecs/226/webprogram/Paper39119.html )

G-ReRAM at Material Research Society (MRS) Fall Meeting 2014

See all important dates and call for papers (http://www.mrs.org/fall-2014-program-m/ )

·         Dr Ilia Valov is a keynote speaker at ISCAS 2014
(http://iscas2014.org/cas-fest/speakers-2/)

·         WOCSDICE/EXMATEC 2014
(link http://exmatec-wocsdice-2014.iesl.forth.gr/)

·         Material Research Society (MRS) Fall Meeting 2014
See all important dates and call for papers (http://www.mrs.org/fall-2014-technical-sessions/)

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