Tandem solar cells and modules

Tandem solar cells combine two semiconductors with different bandgaps. That means we stack two solar cells on top of each other, each optimized for different spectral ranges, and can thus use sunlight more efficiently.
While the top solar cell primarily converts high-energy photons from the blue and green spectral range of sunlight into electrical energy, the bottom solar cell absorbs long-wavelength red and infrared light.
This allows the short-wavelength part of the spectrum to be used more efficiently than with conventional solar cells made of only one semiconductor like silicon.
As a result, significantly higher efficiencies are possible with tandem cells – theoretically up to 45% instead of approx. 33% with single-junction cells.

ISFH offers expertise, process development, simulation tools, and characterization techniques as services for companies – ranging from material manufacturers to module producers. The goal is to transfer technology into industrial processes to strengthen PV production in Europe.

POLO stands for “Poly-Silicon on Oxide.” This is a technology in which a thin oxide layer is applied to the silicon substrate and then covered with doped polycrystalline silicon.
This layer system forms a passivating contact that minimizes electrical losses while offering high charge carrier selectivity.
POLO contacts enable higher efficiencies, are thermally stable, and are suitable for industrial processes. They are considered a key technology for high-efficiency silicon solar cells and are increasingly being integrated into industrial production lines.