Sharp Develops Concentrator Solar Cell with World's Highest Conv

Sharp Develops Concentrator Solar Cell with World's Highest Conversion
Efficiency of 44.4% 
Sets New Record with Concentrator Triple-Junction Compound Solar Cell 
Osaka, June 14, 2013 - (JCN Newswire) -  Sharp Corporation has achieved the
world's highest solar cell conversion efficiency(2) of 44.4%(1), using a
concentrator triple-junction compound solar cell. These solar cells are used in
a lens-based concentrator system that focuses sunlight on the cells to generate
This latest Sharp breakthrough came about through research and development
efforts that are part of the "R&D on Innovative Solar Cells"
project promoted by Japan's New Energy and Industrial Technology
Development Organization (NEDO)(3). Measurement of the value - which sets a
record for the world's highest concentrating conversion efficiency - was
confirmed at the Fraunhofer Institute for Solar Energy Systems (ISE)(4) in
Compound solar cells typically offer high conversion efficiency while
utilizing photo-absorption layers made from compounds of multiple elements,
such as indium and gallium. Sharp's concentrator triple-junction compound
solar cells use a proprietary technology that enables the efficient conversion
of sunlight into electricity by means of a stack of three photo-absorption
layers, the bottommost of which is made from InGaAs (indium gallium arsenide). 
To achieve a concentrating conversion efficiency of 44.4%, Sharp worked to
widen the effective concentrator cell surface and ensure uniformity of width at
the interface of the connecting concentrator cell and electrodes. 
Because of their high conversion efficiency, compound solar cells have thus
far been used primarily on space satellites. Looking to the future, Sharp aims
to harness this latest development success and make the use of compound solar
cells more feasible in terrestrial applications. 
For details and a History of Sharp Compound Solar Cell Development, please see 
(1) Conversion efficiency confirmed by the Fraunhofer Institute for Solar
Energy (ISE, one of several organizations around the world that officially
certifies energy conversion efficiency measurements in solar cells) in April
2013 under a light-concentrating magnification of 302 times (cell surface:
approx. 0.165 cm2).
(2) As of June 14, 2013, for concentrator solar cells at the research level
(based on a survey by Sharp).
(3) NEDO is one of Japan's largest public management organizations for
promoting research and development as well as for disseminating industrial,
energy, and environmental technologies.
(4) ISE was one of the participating members from the EU side at "NGCPV:
A new generation of concentrator photovoltaic cells, modules and systems."
The collaboration is part of the R&D in Innovative Solar Cells project.
(5) InGaP: Indium Gallium Phosphide
- GaAs: Gallium Arsenide
- InGaAs: Indium Gallium Arsenide
- Tunnel junction: Semiconductor junction where electricity flows as if
through metal
- Buffer layer: A layer sandwiched between two materials to accommodate
differences in their structures. 
About Sharp 
Sharp Corporation (TSE: 6753) is a worldwide developer of innovative products
and core technologies that play a key role in shaping the future of
electronics.  As a leader in liquid crystal displays (LCDs) and digital
technologies, Sharp offers one of the broadest and most advanced lines of
consumer electronics, information products and electronic components, while
also creating new network businesses. For more information, please visit . 
Corporate Public Relations Division
Sharp Corporation
Phone: +81-6-6625-3006 (Osaka)
Phone: +81-3-3260-1870 (Tokyo) 
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