Select your localized edition:

Close ×

More Ways to Connect

Discover one of our 28 local entrepreneurial communities »

Be the first to know as we launch in new countries and markets around the globe.

Interested in bringing MIT Technology Review to your local market?

MIT Technology ReviewMIT Technology Review - logo


Unsupported browser: Your browser does not meet modern web standards. See how it scores »

{ action.text }

Stauffer says that his company’s new materials have neither of those problems. He isn’t disclosing details about what the materials are made of, but he says that their crystalline structure is compatible with other semiconductor materials used in multi-junction cells, and they can be modified to absorb different wavelengths to optimize efficiency. (The company calls them Adjustable Spectrum Lattice Matched materials).

The new cells, which use one of the new materials, convert 41 percent of the energy in sunlight into electricity, compared to 38 to 39 percent for other multi-junction cells on the market. (World record efficiencies are higher than this, but researchers have achieved such levels with one-off cells made in the lab, not on a production line.)  A jump of two percentage points can make a big difference in the price of solar systems, especially with concentrated photovoltaics, where only about 20 percent of the cost is the cells. Increasing power output from the cells reduces the number of lenses, metal frames, tracking systems, and other components that account for 80 percent of costs.

Stauffer says that the company has also made two more novel semiconductors that, when added to future cells, could bring efficiencies up to 50 percent. Because the materials can all be easily grown on top of each other, these five-layer devices can be made for the same cost as three-layer devices. He anticipates that the company can produce such cells within five years.

“I wouldn’t be surprised if they get to 50 percent, but the question is when, and how much they will cost,” says Jerry Olson, a principal scientist at the National Renewable Energy Laboratory in Golden, Colorado. He says that the implementation will likely take longer than the company thinks, since the solar cells are complex.

Even at less than 10 cents per kilowatt hour, concentrated photovoltaics will still produce power at rates that are far more expensive than fossil fuel power, which often costs less than six cents per kilowatt hour, and has the considerable advantage of working day and night. Olson says that while concentrated photovoltaics are still relatively uncommon, they have the potential to be the cheapest type of solar photovoltaics, because high concentrations of sunlight reduce both the amount of land and expensive semiconductor material needed.

10 comments. Share your thoughts »

Credit: Solar Junction

Tagged: Energy, energy, renewable energy, solar, photovoltaics, concentrated photovoltaics, multi-junction

Reprints and Permissions | Send feedback to the editor

From the Archives


Introducing MIT Technology Review Insider.

Already a Magazine subscriber?

You're automatically an Insider. It's easy to activate or upgrade your account.

Activate Your Account

Become an Insider

It's the new way to subscribe. Get even more of the tech news, research, and discoveries you crave.

Sign Up

Learn More

Find out why MIT Technology Review Insider is for you and explore your options.

Show Me