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chasil · 2 months ago
sitkack · 2 months ago
https://arstechnica.com/science/2019/08/16-bit-risc-v-proces...

Modern microprocessor built from complementary carbon nanotube transistors https://www.nature.com/articles/s41586-019-1493-8

justinclift · 2 months ago
Wonder if these materials are the kind of thing the "make your own integrated circuits" people would be able to use?

ie: https://sam.zeloof.xyz/category/semiconductor/

muglug · 2 months ago
> at frequencies up to 25 kilohertz

How high could this technique go?

magicalhippo · 2 months ago
From the abstract[1]:

This enabled circuit operation below 3 V with an operating frequency of up to 25 kHz, which was constrained by parasitic capacitances

I would guess process improvements would help a lot towards lowering those parasitics. So I wouldn't take this initial attempt as a guide for ultimate speed.

Since this is 2D materials, a capacitor is a dielectric sandwiched by two conductors and capacitance scales linearly with area, I would assume just scaling things down would help immensely with parasitic capacitance. Changing materials or process could also change the dielectric constant which also affects the capacitance linearly.

Paper is sadly not open access, so I can't check if they mention this or have done some theoretical peak calculations or something. Would indeed be interesting to know.

[1]: https://www.nature.com/articles/s41586-025-08963-7

numpad0 · 2 months ago

  > molybdenum disulfide for n-type transistors and tungsten diselenide for p-type transistors  
Isn't this rather unusual?

NegativeK · 2 months ago
Yes? But it’s been in research for a decade or two, based on a quick search.

It’s confusing to me because moly d is a very common lubricant, even for home uses.

avmich · 2 months ago
Isn't it a good lubricant because it's easily split into 2D layers?
m-watson · 2 months ago
Something that is nice with MoS2 and the others are transition metal dichalcogenides and have some beneficial physical properties like a natural electronic bandgap, unlike silicon.
RayfromBoston · 2 months ago
I wonder how this compares in speed and capabilities to photonic computers
ConradKilroy · 2 months ago
I was wondering that too!
Valgrim · 2 months ago
Molybdenum and tungsten both have melting point much higher than silicon, Maybe these circuits could be a good candidate for Venus rovers?
kxndnddn · 2 months ago
I don't see how that would be relevant since the melting temperature of Silicon is already _significantly_ higher than temperatures on Venus can reach outside of reentry
znpy · 2 months ago
Isn’t tungsten much much more expensive than silicon and harder to work with?
IsTom · 2 months ago
Does its price really matter for amounts used in chips?
znpy · 2 months ago
i mean, can you imagine how many chips are built?

nowadays there's at least a chip in most physical objects...

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