Scientists develop solar cells with a ‘twist’

Sliced Silicon Chips, 100 Times Thinner Than A Wafer, Can Be Used As Window Tints In Cars, Buildings

Chicago: US researchers have found a way to make efficient silicon-based solar cells that are flexible enough to be rolled around a pencil and transparent enough to be used to tint windows on buildings or cars.

The finding, reported on Sunday in the journal Nature Materials, offers a new way to process conventional silicon by slicing the brittle wafers into ultrathin bits and carefully transferring them onto a flexible surface.

“We can make it thin enough that we can put it on plastic to make a rollable system. You can make it gray in the form of a film that could be added to architectural glass,” said John Rogers of the University of Illinois.

“It opens up spaces on the fronts of buildings as opportunities for solar energy,” Rogers said. Solar cells, which convert solar energy into electricity, are in high demand because of higher oil prices and concerns over climate change.

The new technology could be used on car windows, generating enough electricity to power the GPS or air conditioning.

Many companies, including Japanese consumer electronics maker Sharp Corp and Germany’s Q-Cells are making thinfilm solar cells, but they typically are less efficient at converting solar energy into electricity than conventional cells.

Rogers said his technology uses conventional single crystal silicon. “It’s robust. It’s highly efficient. But in its current form, it’s rigid and fragile,” he said.

Rogers’ team uses a special etching method that slices chips off the surface of a bulk silicon wafer. The sliced chips are 10 to 100 times thinner than the wafer, and the size can be adapted to the application.

Once sliced, a device picks up the bits of silicon chips “like a rubber stamp” and transfers them to a new surface material, Rogers said. “These silicon solar cells become like a solid ink pad for that rubber stamp. The surface of the wafers after we’ve done this slicing become almost like an inking pad,” he said. “We just print them down onto a target surface.”

The final step is to electrically connect these cells to get power out of them, he said. Adding flexibility to the material would make the cells far easier to transport. Rogers envisions the material being “rolled up like a carpet and thrown on the truck.”

“The work could create new ways to use silicon in photovoltaics – as ‘tinting’ films in architectural or automotive glass (like sunroofs); as large area ‘rollable’ sheets; or as lightweight ‘solar skins’ for integration onto structural surfaces on buildings or even aircraft,” says Rogers. REUTERS

The new technology could be used on car windows, generating enough electricity to power the GPS or air conditioning

The material can be ‘rolled up like a carpet and thrown on the truck’

Spaces on the fronts of buildings can be used to power the buildings themselves

Lightweight ‘solar skins’ for integration onto structural surfaces on buildings or even aircraft