Black silicon solar cells with record 18.7% efficiency

Apr 04, 2013

Scientists at Aalto University, Finland and Fraunhofer ISE, Germany report an efficiency of 18.7% for black silicon solar cells, the highest efficiency reported so far for a black silicon solar cell.

The researchers were able to apply a boron diffusion to create a pn-junction, maintaining the excellent optical properties of the black . By applying atomic layer deposited Al2O3, an effective passivation of the nanostructured surfaces was achieved. The previous efficiency record of 18.2% was held by the U.S. Department of Energy's National Renewable Energy Laboratory (NREL) using thermal oxidation as a passivating layer.

"The measurements reveal that the nanostructured front surface is of a high electrical quality comparable to a pyramidal textured surface," says Assistant Professor Hele Savin of Aalto University.

Routes for improving the cell efficiency are already identified, and efficiencies clearly above 20% should be within reach.

The paper, 'Passivation of Black Silicon Boron Emitters with ALD Al2O3' by Päivikki Repo, Ville Vähänissi, Guillaume von Gastrow, Jan Benick, Jonas Schön, Bernd Steinhauser, Martin C. Schubert and Hele Savin, was presented in SiliconPV, the 3rd International Conference on Photovoltaics, 25-27 March 2013 in Hamelin, Germany.

Explore further: Lithium from the coal in China: Extracting lithium metal from Chinese coal

add to favorites email to friend print save as pdf

Related Stories

Nanostructures improve solar cell efficiency

May 26, 2011

To make solar cells a competitive alternative to other renewable energy sources, researchers are investigating different alternatives. A step in the right direction is through new processes that change the ...

Recommended for you

Demonstration of "CrystEna" energy storage system

16 hours ago

Hitachi America, Ltd., a wholly owned subsidiary of Hitachi, Ltd. and Demansys Energy, Inc. ("Demansys"), a smart grid technology company with offices in Connecticut and Troy, New York, announced today that ...

Creating the energy Internet

16 hours ago

It only takes a power outage of a few minutes in the middle of a busy workday to drive home the hazards of relying on an energy infrastructure rooted in the Industrial Age. Without the electricity delivered ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.