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Academics scale PCM with carbon nanotubes

3/14/2011 09:54 AM EDT
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R G.Neale
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re: Academics scale PCM with carbon nanotubes
R G.Neale   3/14/2011 6:32:59 PM
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Volatile Memory; I think you are being a little bit hard on your interpretation of the motives of Prof Pop and his colleagues a “charlatans”. There maybe some associated with PCM but I think it is unfair to describe this particular group in the way you have. Although this has not changed my views on PCM scaling, my view is that Prof Pop et al are doing exactly what a University Department should be doing. In the end the paymasters (including taxpayers) must decide on the value of the work, but the choice of work must be left to the Profs and Department heads. Real progress is made by trying to prove the established wisdom (or lack of it) wrong. They are teaching new graduates the difficulties and pit-falls of handling carbon nano-tubes and working with structures with dimensions of a few nm. This will surely enhance their ability to contribute at the leading edge in their future careers, while in the near term there are likely to be bi-products of their work that have nothing to do with PCM. I think there is even one associated with PCM and their gap structure they may have missed, but notwithstanding that they already have the basis of a discrete low current fuse. I am in the process of preparing PCM Progress Report Part 2 and I will discuss my view of the shortcomings of the CNT-PCM work in that-EETimes editors willing.

resistion
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re: Academics scale PCM with carbon nanotubes
resistion   3/14/2011 2:33:38 PM
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An interesting feature is the phase-change region is surrounded by the high-resistance amorphous GST. This is similar to ReRAM. Realistically, standard semiconductor processing steps will crystallize this surrounding amorphous, which cannot be tolerated without wrapping the CNT's or any electrodes in dielectric isolation. With crystalline lower-resistance surroundings, the RESET current has to be larger, since you have to address all possible current paths.

unknown multiplier
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re: Academics scale PCM with carbon nanotubes
unknown multiplier   3/14/2011 2:10:42 PM
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academics + carbon nanotubes = unreliable

resistion
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re: Academics scale PCM with carbon nanotubes
resistion   3/14/2011 12:44:49 PM
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The big problem is amorphous glass resistance and Vth drift. And it can't retain any data at 150 C. The last I checked GST also has a minimum crystallization time on the order of 100 ns.

Volatile Memory
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re: Academics scale PCM with carbon nanotubes
Volatile Memory   3/14/2011 12:27:56 PM
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If I understood Mr. Neale's series of four articles correctly, Prof. Pop and colleagues are simply a bunch of charlatans as they have done nothing to address the real problems that plague PCM/PRAM. And the last time I checked, no commercial product on the market uses any phase-change memory, and of course, neither Numonyx nor Samsung is selling any PCM/PRAM.

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