Frances National Solar Energy Institute (INES), a division of the French Alternative Energies and Atomic Energy Commission (CEA), and WattByWatt, a Canadian startup, unveiled a two-terminal, 9 cm� perovskite-silicon tandem solar cell with a power conversion efficiency of 28%.
It combines WattByWatts proprietary ink formulation and its ambient air wet-process for depositing the perovskite-based active layer with a CEA reference two-terminal tandem cell architecture.
These results open up new perspectives for the scaling and industrialization of tandem perovskite-on-silicon technology using high-potential processes, said CEA in a statement.
The two organizations have an ongoing collaboration to develop processes for manufacturing tandem solar cells.
WattByWatt, founded in 2020, has been developing single-junction perovskite indoor PV mini-modules for applications such as smoke detectors, locks, cameras, and remote controls. Its R&D is focused on depositing perovskite absorber layers for both single-junction and tandem perovskite-silicon solar cells based on its novel ink formulation and an ambient wet-process for deposition.
Earlier this year, CEA-INES reported a 30.8% efficient tandem perovskite-silicon solar cell made in collaboration with Enels 3Sun, just four months after announcing their collaboration on a 29.8%-efficient device.
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