13 Mar 2012:
Thinner Silicon Wafers
Could Cut Solar Cell Costs in Half
A U.S. company has developed a new manufacturing technique that it says could cut the cost of producing solar cells in half by producing silicon wafers that are about one-tenth as thick as conventional wafers. Twin Creeks Technologies
, a San Jose-based company, says it can produce crystalline silicon wafers that are only 20 microns thin — or about one-fifth the thickness of a layer of paint
— compared with the 200-micron wafers commonly used in solar cells. While the conventional technologies use diamond saws to cut blocks of silicon — a process that wastes about half of the silicon — the new process essentially embeds protons at a desired depth within a block of silicon and heats the protons so that they occupy more space. Eventually the company is able to crack off the thin, 20-micron wafers, after which they are affixed to a thin metal backing
that makes them durable enough to withstand the rest of the production process. The company has raised $93 million in venture capital, some of which will be used to build a solar factory in Mississippi.
Yale Environment 360 is
a publication of the
Yale School of Forestry
& Environmental Studies
Yale Environment 360
articles are now available in Spanish and Portuguese on Universia
, the online educational network. Visit the site.
Business & Innovation
Policy & Politics
Pollution & Health
Science & Technology
Antarctica and the Arctic
Central & South America
A three-part series Tainted Harvest
looks at the soil pollution crisis in China, the threat it poses to the food supply, and the complexity of any cleanup. Read the series.
is now available for mobile devices at e360.yale.edu/mobile
The Warriors of Qiugang
, a Yale Environment 360
video, chronicles a Chinese village’s fight against a polluting chemical plant. It was nominated for a 2011 Academy Award for Best Documentary Short.
Watch the video.
Top Image: aerial view of Iceland
. © Google & TerraMetrics.
, winner of the Yale Environment 360 Video Contest, documents the work of African researchers monitoring wildlife in Uganda's remote Bwindi Impenetrable National Park. Watch the video.