OSA-Direct
Thursday, 16 Aug 2018

Imec achieves 27.1 percent efficiency for perovskite-silicon tandem photovoltaic cell

This perovskite-silicon tandem photovoltaic cell surpasses the record efficiency for single silicon solar cells - future engineered perovskite material bring efficiencies > 30% in reach

imec - 4-terminal perovskite/silicon tandem photovoltaic cell

27 Jul 2018 | Editor

Imec within the partnership of EnergyVille has announced a record result for its 4-terminal Perovskite/silicon tandem photovoltaic cell. With a power conversion efficiency of 27.1 percent, the new Imec tandem cell beats the most efficient standalone silicon solar cell. Further careful engineering of the Perovskite material will bring efficiencies over 30% in reach.

According to Imec their new record tandem cell uses a 0.13 cm2 spin-coated Perovskite cell developed within our Solliance cooperation stacked on top of a 4 cm2 industrial interdigitated back-contact (IBC) silicon cell in a 4-terminal configuration, which is known to have a higher annual energy yield compared to a 2-terminal configuration.

Additionally, scaling up the tandem device by using a 4 cm2 perovskite module on a 4 cm2 IBC silicon cell, a tandem efficiency of 25.3% was achieved, surpassing the stand-alone efficiency of the silicon cell.

Imec added that perovskite microcrystals are a promising material system to make high-performance thin-film solar cells. They can be processed into thin, light, semitransparent modules that can achieve a high power conversion efficiency, are inexpensive to produce, and have a high absorption efficiency for sunlight. Because they can be made semitransparent, perovskite solar cells and modules can also be used on top of silicon solar cells.

When the perovskite is carefully engineered, the absorbance in the perovskite minimizes the thermal losses that occur in the silicon cell. As a result, a perovskite-silicon tandem solar cell can potentially reach power conversion efficiencies above 30 percent.

"We have been working on this tandem technology for two years now, and the biggest difference with previous versions is in the engineering and processing of the Perovskite absorber, tuning its bandgap to optimize the efficiency for tandem configuration with silicon."

Manoj Jaysankar, Doctoral researcher at imec/EnergyVille

"Adding Perovskite on top of industrial silicon PV may prove to be the most cost-effective approach to further improve the efficiency of photovoltaics."

"Therefore, we invite all companies in the PV value chain that are looking into higher efficiencies, to partner with us and explore this promising path."

Tom Aernouts, Group leader for thin-film photovoltaics at imec/EnergyVille
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www.imec.be    www.energyville.be   


About EnergyVille

EnergyVille is a collaboration of the Flemish research centers KU Leuven, VITO, imec and UHasselt in the field of sustainable energy and intelligent energy systems, and a partner in Solliance (www.solliance.eu), a partnership of R&D organizations from the Netherlands, Belgium and Germany working in thin film photovoltaic solar energy.

Source: EnergyVille

About imec

Imec is the world-leading research and innovation hub in nanoelectronics and digital technologies. The combination of our widely acclaimed leadership in microchip technology and profound software and ICT expertise is what makes us unique. By leveraging our world-class infrastructure and local and global ecosystem of partners across a multitude of industries, we create groundbreaking innovation in application domains such as healthcare, smart cities and mobility, logistics and manufacturing, energy and education.

Imec is a partner in EnergyVille (www.energyville.be). EnergyVille is a collaboration of the Flemish research centers KU Leuven, VITO, imec and UHasselt in the field of sustainable energy and intelligent energy systems, and a partner in Solliance (www.solliance.eu), a partnership of R&D organizations from the Netherlands, Belgium and Germany working in thin film photovoltaic solar energy.

As a trusted partner for companies, start-ups and universities imec brings together more than 4,000 brilliant minds from over 85 nationalities. Imec is headquartered in Leuven, Belgium and has distributed R&D groups at a number of Flemish universities, in the Netherlands, Taiwan, USA, China, and offices in India and Japan. In 2017, imec's revenue (P&L) totaled 546 million euro.

Source: imec


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