EPFL team develops tandem solar cells with 29.2% efficiency

EPFL scientists in Neuchâtel have reported a tandem solar cell that can deliver a certified efficiency of 29.2%. This achievement was made possible by combining a perovskite solar cell with a textured silicon solar cell.

One obstacle the team encountered was finding a way to evenly coat the silicon surface—which is intentionally rough, or textured—with a thin film of halide perovskites. A textured surface is used in order to minimize light reflection. This kind of system can already be found in all commercially available crystalline silicon cells.

Perovskite-organic tandem solar cells with indium oxide interconnects display impressive efficiency

A group of scientists from the University of Wuppertal, the University of Tübingen, the University of Potsdam, HZB, Max Planck Institute and the University of Cologne in Germany recently developed a perovskite-organic tandem solar cell with optimized charge extraction, a high open-circuit voltage and a thickness of just 1 µm.

The tandem configuration includes a narrow-bandgap organic subcell with a p-i-n-type architecture based on the polymer PM6 and molybdenum oxide (MoOx) as the hole extraction layer (HEL). The cell has a power conversion efficiency of 17.5%, an open-circuit voltage of 0.87 V, a short-circuit current of 26.7 mA cm−², and a fill factor of 75%. The wide-bandgap perovskite subcell was built with a perovskite known as FA0.8Cs0.2Pb(I0.5Br0.5)3, with an efficiency of 16.8%, an open-circuit voltage of 1.34 V, a short-circuit current of 15.6 mA cm−², and a fill factor of 81%.

ZSW ramps up research plants for perovskite tandem solar cells

The Centre for Solar Energy and Hydrogen Research Baden-Württemberg (ZSW), aiming to fast-track tandem solar technology’s time to market, has put two new high-performance coating plants into operation.

ZSW to fast-track tandem tech plants image

The systems produce tandem solar cells consisting of a perovskite solar cell that can be combined with other types of solar cells. The various layers are deposited under ultra-clean conditions. Companies in the solar sector can take advantage of these capabilities to optimize their developments in the area of tandem solar cells.

New NEXUS project for tandem perovskite PV gets green light

The European Commission has recently given the green light to an agreement to finance the NEXUS project, focused on the development of innovative processes for TANGO HJT/Perovskite technology for the production of sustainable and high-performance photovoltaic modules.

Coordinated by the University of Oxford, the NEXUS project is supported by a multidisciplinary consortium with 12 partners from 9 European countries; 5 industrial partners, including 2 small and medium-sized enterprises (SMEs); and 7 research and technology organizations.

China-based Golden Solar enters agreement to pursue perovskite tandem solar cells

Chinese company Golden Solar has signed an agreement with two partners to pursue commercial production of perovskite tandem solar cells with “more than 28%” conversion efficiency.

The Chinese company, which has extremely varied areas of business, is focusing on HJT manufacturing and will combine its solar wafer and HJT technology with the HJT expertise of solar manufacturer Gold Stone (Fujian) Energy Co. Ltd. It will also draw upon the perovskite and tandem knowledge of the National University of Singapore‘s Solar Energy Research Institute of Singapore.