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Perovskites - once more into the breach
sixscrews   4/8/2014 6:44:38 PM
Back in 1986 perovskites were the cat's pyjamas - as superconductors - and we all (or at least some of us) remember what happened after that.

So, beware - it's just a material.  What you do with it makes all the difference - or maybe it's how you market it?


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Re: Did I miss something?
Anand.Yaligar   4/8/2014 2:48:35 PM
@Etmax, I believe I also got mixed up and lost just as you are; if the best solar cells have efficiency of up to 25% and the most popular solar cells work at efficiency rates of 17-19%, I still can't see how a new material that converts light to electricity at 12-15% efficiency rates can be said to be more efficient than both of the first two. Maybe their strong point is the cheaper price though if that is the case then more of the latter material will have to be used to raise those efficiency rates. Please clarify further Kevin.

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prabhakar_deosthali   4/7/2014 8:35:47 AM
The main obstacle of today's solar energy conversion equipment is the heavy capital cost. If this can be offset by this new discovery then there will be a wide spread acceptance to using solar energy in many applications -icluding charging of EVs

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Re: Perovskite Nit Pick
mna41   4/5/2014 7:09:48 PM
As Bollinger says, the mineral perovskite is calcium titanate, but the meaning of "perovskite" has been extended to the crystal structure. In the latter sense, there are many perovskites. The article is confusing because it doesn't say *which* perovskite compounds or alloys have the unusually high optical absorption (wavelengths also not specified). Moreover, perovskites, being chemical compounds, are absolutely not metamaterials. I'd have hoped for a minimally well-informed article bfrom EE Times, not the mishmash that I tried to decipher.

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Perovskite Nit Pick
Terry.Bollinger   4/4/2014 12:23:41 PM
Perovskite is actually the mineral calcium titanate, but because it and similar compounds often have remarkable and interesting electronic properties -- David Brin even used it in his scifi novel Earth to create "intelligent planets" -- the term has also come to refer to any compound that crystallizes with a perovskite-like structure. I'm not quite sure what this compound should be called, but I strongly suspect that original intent was to say that it has a perovskite structure.

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Light to Electricity to Light
DrFPGA   4/4/2014 12:07:18 PM
Seems like a natural for optical transistors. Not sure how you would make complex integrated circuits out of this stuff however. Seems to be too complicated a substance to 'grow' it the way we do transistors...

Anyone know?

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Did I miss Something?
Etmax   4/4/2014 12:59:16 AM
So 12-15% earlier, how much now?? What limit predicted?

As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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