Design Con 2015
Breaking News
Comments
_hm
User Rank
CEO
Major Technology Achievement
_hm   9/6/2013 8:21:35 PM
NO RATINGS
This is a major technological achievement. Hope they work more to make it apply to practical devices. It will interesting to know quantitative comparision - gain in speed, saving in power, voltage level required to operate it.

R_Colin_Johnson
User Rank
Blogger
Re: Major Technology Achievement
R_Colin_Johnson   9/6/2013 9:07:32 PM
NO RATINGS
Their next step is optimization, before they try to build a transistor. You can get more details about specs etcs. in the Applied Physics Letters paper :(but its NOT free):

http://apl.aip.org/resource/1/applab/v102/i14/p143501_s1

rick merritt
User Rank
Author
Re: Major Technology Achievement
rick merritt   9/6/2013 9:47:34 PM
NO RATINGS
We need CMOS alternatives. Keep cranking guys!

goafrit
User Rank
Manager
Re: Major Technology Achievement
goafrit   9/8/2013 5:57:21 AM
NO RATINGS
Is this about CMOS or the material? I think we can still have CMOS design paradigm with another material beside Silicon. I hope we crack this code soon as it is long overdue. Something needs to help provide a new path for the continuation of Moore's law

Kinnar
User Rank
CEO
Re: Major Technology Achievement
Kinnar   9/8/2013 5:59:59 AM
NO RATINGS
Yes quite true, the industries are desperately looking for the CMOS alternative that can work beyond Gigahertz, since this metal alternatives have got bandwidth ranging upto Terahertz, if this time the technology gets commercially accepted it will really open a new era.

Phononscattering
User Rank
Manager
What does it do?
Phononscattering   9/7/2013 2:12:54 AM
NO RATINGS
Ok, so i'll be the first one to bite. What does this device actually do?

To me, it looks like a two terminal tunneling device with electrodes at two different work functions. The difference in work function means that the I/V behavior will be asymmetric, so it could show a weak diode like behavior, but probably still a lot different to what we are used to from semiconductor diodes.

Since there is no semiconductor involved, switching delays caused by minority carrier recombination (diffusion capacitance) should be absent. That is probabably the reason for the claim for speed. However there could be a disadvantage due to the extremely high capacitance of the MIM structure.

There are some other drawbacks too: The way quantum tunneling behaves in such a two layer devices means that there are some second order slope changes in the I/V behavior. The material used (Al2O3 and HfO2) are also prone to electron trapping. This means that there are most likely additional conduction mechanisms, which will give rise to device leakage at low bias, dielectric relaxation (1/t decaying current after switch) and noise.

So here are my questions:
  1. What is the exact application of this device?
  2. What are the relevant figures of merit that are optimized in respect to semiconductor diodes? How does it compare in the other ones?
  3. How is this supposed to "beat CMOS" or lead to transistors? My understanding so far is, that this is a two- not three terminal device. So it can not replace a transistor.


resistion
User Rank
CEO
Re: What does it do?
resistion   9/7/2013 3:25:01 AM
NO RATINGS
Yes as two terminal, a larger voltage is needed to drive a current compared to a transistor, which uses a third terminal to modulate current.

Phononscattering
User Rank
Manager
Re: What does it do?
Phononscattering   9/7/2013 4:33:09 AM
NO RATINGS
Ok, after some web searching I found comprehensive information. Seems like the technology itself is not new and has already performed well in the past, but failed commercially due to lack of differentiating applications.


Too bad the article mentions none of this

 

http://ecee.colorado.edu/~moddel/QEL/MIIM_Overview.pdf

http://ecee.colorado.edu/~moddel/QEL/Phiar.html

http://ecee.colorado.edu/~moddel/QEL/Papers/Rockwell08.pdf

 

 

 

R_Colin_Johnson
User Rank
Blogger
Re: What does it do?
R_Colin_Johnson   9/7/2013 7:14:12 AM
NO RATINGS
Thanks for the context and references. Yes, these metal-insulator structures seem to be one of those eternally "almost here" technologies that researchers just keep plugging away at.

 

resistion
User Rank
CEO
Re: What does it do?
resistion   9/7/2013 2:14:29 PM
NO RATINGS
http://ecee.colorado.edu/~moddel/QEL/Papers/Rockwell08.pdf

 

the diode is hardly nonlinear enough.

Ron Neale
User Rank
Blogger
Re: What does it do? Light or uW as third terminal
Ron Neale   9/7/2013 3:55:06 PM
NO RATINGS
Phononscattering "How is this supposed to "beat CMOS" or lead to transistors? My understanding so far is, that this is a two- not three terminal device. So it can not replace a transistor."

For a two terminal device structure, think of light or microwave input as the third terminal. Where the device is mounted in a lightwaveguide or a microwave guide. As we push frequencies higher those two will tend to merge. Quantum  coupling efficiency will be the equivalent of gain.

The reliability of MIMs has been a problem in the past and limited widespread use. Given reliability they may find application in optical detectors in high speed backplanes. Who knows when TSVs run out of signal carrying capacity optical detection MIMs might allow TSV to be just holes!!

 

 

Yog-Sothoth
User Rank
Freelancer
Sounds a bit like a tunnel diode
Yog-Sothoth   9/8/2013 4:14:10 AM
NO RATINGS
Tunnel diodes were in the 60's the solution looking for a problem. But being two terminal they never caught on. Input/output isolation of two terminal devices is always going to be a problem.

 

 

Phononscattering
User Rank
Manager
Re: Sounds a bit like a tunnel diode
Phononscattering   9/9/2013 3:33:34 AM
NO RATINGS
It definitely IS a tunnel diode. But not a semiconductor but a metal electrode one. The difference is, that the semiconductor tunnel diode of the 60ies shows a region of negative differential resistance which allows some interesting applications as oscillator nd so on. The MIM diode can not show this kind of behavior due to the different band structure of the electrodes.

My current understanding of the MIIM diode is, that its main application is as a demodulator/detecter for very high freqiencies.

resistion
User Rank
CEO
missing point about tunneling
resistion   9/8/2013 6:13:33 AM
NO RATINGS
A tunneling-based device may be ideally designed or optimized for high nonlinearity. But it should be recognized that tunneling is not expected to be a high current output mechanism matching CMOS. A MOSFET that is off is already a tunneling barrier (reverse bias pn junction depletion zone) with nonlinearity.



Top Comments of the Week
Flash Poll
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Carlos Bueno

Adventures in Userland
Carlos Bueno
Post a comment
Editor’s Note: Excerpted from Lauren Ipsum: A story about computer science and other improbable things, author Carlos Bueno introduces us to Lauren and her adventures in ...

Max Maxfield

Tired Old iPad 2 vs. Shiny New iPad Air 2
Max Maxfield
9 comments
I remember when the first iPad came out deep in the mists of time we used to call 2010. Actually, that's only four years ago, but it seems like a lifetime away -- I mean; can you remember ...

Martin Rowe

Make This Engineering Museum a Reality
Martin Rowe
Post a comment
Vincent Valentine is a man on a mission. He wants to make the first house to ever have a telephone into a telephone museum. Without help, it may not happen.

Rich Quinnell

Making the Grade in Industrial Design
Rich Quinnell
16 comments
As every developer knows, there are the paper specifications for a product design, and then there are the real requirements. The paper specs are dry, bland, and rigidly numeric, making ...

Special Video Section
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...
Why culture makes Linear Tech a winner.
Recently formed Architects of Modern Power consortium ...
Specially modified Corvette C7 Stingray responds to ex Indy ...
Avago’s ACPL-K30T is the first solid-state driver qualified ...
NXP launches its line of multi-gate, multifunction, ...
Doug Bailey, VP of marketing at Power Integrations, gives a ...
See how to ease software bring-up with DesignWare IP ...
DesignWare IP Prototyping Kits enable fast software ...
This video explores the LT3086, a new member of our LDO+ ...
In today’s modern electronic systems, the need for power ...