Breaking News
Comments
Oldest First | Newest First | Threaded View
Page 1 / 2   >   >>
_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!

Phononscattering
User Rank
Rookie
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
Rookie
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.

 

 

Page 1 / 2   >   >>


EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

Aging Brass: Cow Poop vs. Horse Doo-Doo
Max Maxfield
38 comments
As you may recall, one of the things I want to do with the brass panels I'm using in my Inamorata Prognostication Engine is to make them look really old. Since everything is being mounted ...

EDN Staff

11 Summer Vacation Spots for Engineers
EDN Staff
11 comments
This collection of places from technology history, museums, and modern marvels is a roadmap for an engineering adventure that will take you around the world. Here are just a few spots ...

Glen Chenier

Engineers Solve Analog/Digital Problem, Invent Creative Expletives
Glen Chenier
11 comments
- An analog engineer and a digital engineer join forces, use their respective skills, and pull a few bunnies out of a hat to troubleshoot a system with which they are completely ...

Larry Desjardin

Engineers Should Study Finance: 5 Reasons Why
Larry Desjardin
45 comments
I'm a big proponent of engineers learning financial basics. Why? Because engineers are making decisions all the time, in multiple ways. Having a good financial understanding guides these ...

Flash Poll
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)