Popular Articles
Sunovia set to take on First Solar in two years? - 01 May 2008
Xtreme Concentrated Photovoltaics start-up claims 5 cents per kWh - 29 April 2008
Polysilicon shortages will spur thin film CAGR of 70 percent through 2010, says iSuppli - 02 May 2008
Sunovia claims lab breakthrough for commercialization of single crystalline epitaxial CdTe/Si - 12 May 2008
Metallurgical solar-grade silicon could reshape PV industry, says PHOTON Consulting - 09 May 2008
Measured
and confirmed by NREL (National Renewable Energy Laboratory, US), IMEC
has succeeded in demonstrating a record conversion efficiency of 24.7
percent from a single-junction GaAs cell, grown epitaxially on a Ge
substrate. The record results are part of the ESA-IMAGER project in
which IMEC is involved (see correction below).
The focus of the project is to develop a hybrid monolithic/mechanically-stacked triple-junction solar cell that consists of III-V materials as the top cells with Ge cells making up the bottom of a concentrator-based PV solution. The aim is to reach 35 percent plus conversion efficiencies.
The record cell measures 0.25cm², and shows an efficiency of 24.7%, with an open-circuit voltage (Voc) of 999 mV, a short-circuit current (Jsc) of 29.7 mA/cm², and a fill factor of 83.2 percent. The cell was made under the ESA-IMAGER project.
* Correction: We incorrectly reported in this story that the development of a hybrid monolithic/mechanically-stacked triple junction solar cells was under the ESA-IMAGER project. However, IMEC has informed us that this aspect only relates to the 24.7 percent single junction GaAs cell recorded measurements. IMEC is heading its own developments in respect to III-V materials based solar cell research.
