Tandem Photovoltaics Enables New Heights in Solar Cell Effic

© Fraunhofer ISE – Michael Schachtner | The rainbow colors show the diffraction of sunlight by a mirror with a nanostructured grating, which was applied to the back of the silicon subcell. The sun’s spectrum is thus captured even better in the silicon bottom cell.
25.04.2021
Tandem Photovoltaics Enables New Heights in Solar Cell Efficiencies
The new monolithic triple-junction solar cell – or more specifically, a III-V//Si tandem solar cell – converts 35.9 % of sunlight into electrical energy.
Fraunhofer ISE has been conducting cutting-edge research in photovoltaics for forty years. Continually the institute has brought forth record cell efficiencies in different material classes and made important contributions in reducing the costs of solar electricity, which is the cheapest form of energy generation today. Photovoltaics, along with wind energy, is the central pillar of the energy transition. Aiming to further reduce the area required for PV installations as well as material use, Fraunhofer ISE is focusing on tandem photovoltaics. This cell technology allows the traditional efficiency limits to be exceeded by selectively combining different solar cell materials. The Freiburg researchers have again succeeded in setting a new world record with a monolithic tandem cell made of III-V and silicon semiconductors.

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