Sustainable Energy

The Year in Materials

Vibrant displays head to market, invisibility cloaks become more practical, and batteries store more energy.

  • by Kevin Bullis
  • December 29, 2011
  • Light warp: This is the largest sheet ever made of a metamaterial that can bend near infrared light backward.

Tiny crystals called quantum dots emit intense, sharply defined colors. Now researchers have made LED displays that use quantum dots. Five years ago, QD Vision demonstrated its first, rudimentary one-color displays, using the nanoscale crystals. This year it demonstrated a full-color display capable of showing video. The company says it could be another five years before the technology appears in commercial displays. Samsung might get there first—it’s also developing quantum-dot displays, and demonstrated a full-color one in February.

Quantum-dot displays could use far less energy than LCDs. Another ingenious way to reduce energy use is make displays that emit no light at all, but instead reflect ambient light, an approach being taken by Qualcomm with its full-color Mirasol displays, which use only a tenth of the energy of an LCD. The technology has started to appear in tablet computers in South Korea.

No display looks good after it’s covered with fingerprints. A new coating based on soot from a candle flame could provide a cheap oil-repelling layer that could eliminate smudges.

Novel nanostructured materials could greatly enhance the power output of solar panels and make them cheaper by capturing light that would have otherwise been reflected. They could also achieve these goals by converting near infrared light into colors that conventional silicon solar cells can absorb. Another material could render stealth aircraft invisible at night—and invisible to radar night and day.

Metamaterials offer another approach to invisibility: instead of absorbing light, metamaterials bend it around an object. Until this year, researchers have only been able to make metamaterials on a small scale—less than a millimeter across. Now they’ve made them big enough to be practical. They don’t work yet for all wavelengths of light, but they could render  objects invisible to night vision equipment.

Stanford researchers built a battery electrode that can be recharged 40,000 times—compared to the 1,000 charges you’d get with a typical laptop battery. Since the electrode lasts so long, and is made of abundant materials, it could provide an inexpensive way to store power from wind turbines and solar panels.

Other researchers have developed inexpensive materials that can store 10 times as much energy as conventional graphite electrodes in lithium-ion batteries. Paired with an equally high-capacity opposite electrode, these could transform portable electronics and electric vehicles. One technology in particular, from Lawrence Berkeley National Laboratory, seems promising because it uses a conductive polymer that can be incorporated into existing manufacturing lines, instead of requiring the expensive new technology for making nanostructures required by others.

New tools could speed the next materials breakthroughs. A modeling program developed at Harvard has led to one of the best organic semiconductors ever made. And a robotic system for making thousands of battery cells with unique electrode chemistries has discovered materials that could boost lithium-ion battery storage capacity by 25 percent.

Cut off? Read unlimited articles today.

Become an Insider
Already an Insider? Log in.

Uh oh–you've read all of your free articles for this month.

Insider Premium

$179.95/yr US PRICE

More from Sustainable Energy

Can we sustainably provide food, water, and energy to a growing population during a climate crisis?

Want more award-winning journalism? Subscribe to Insider Plus.

  • Insider Plus {! !}*

    {! insider.display.menuOptionsLabel !}

    Everything included in Insider Basic, plus ad-free web experience, select discounts to partner offerings and MIT Technology Review events

    See details+

    What's Included

    Bimonthly home delivery and unlimited 24/7 access to MIT Technology Review’s website.

    The Download. Our daily newsletter of what's important in technology and innovation.

    Access to the Magazine archive. Over 24,000 articles going back to 1899 at your fingertips.

    Special Discounts to select partner offerings

    Discount to MIT Technology Review events

    Ad-free web experience

You've read all of your free articles this month. This is your last free article this month. You've read of free articles this month. or  for unlimited online access.