What are multi-junction solar cells?

Multi-junction (MJ) solar cells are solar cells with multiple p–n junctions made of different semiconductor materials. Each material's p–n junction will produce electric current in response to different wavelengths of light.

Are multi-junction solar cells a viable option?

While they have the potential to be many times more efficient than traditional solar cells, high production costs and continuing research and development means that multi-junction cells are not currently commercially available or feasible.

What materials are used in a multi-junction solar cell?

Instead, materials like gallium indium phosphide (GaInP), indium gallium arsenide (InGaAs), and germanium (Ge) are used to create separate layers of semiconductors that all respond to different wavelengths of incoming sunlight. Layers in a multi-junction solar cell. Source:

What is the limiting efficiency of infinite multi-junction solar cells?

Hence, the limiting efficiency of ideal infinite multi-junction solar cells is evaluated to be 68.8% by comparing the shaded area defined by the red line with the total photon-flux area determined by the black line. (This is why this method is called "graphical" QE analysis.)

Can AlGaAs tunnel junction be used for multijunction solar cells?

"AlGaAs Tunnel Junction for high efficiency multi-junction solar cells: simulation and measurement of temperature-dependent operation" (PDF). Archived from the original (PDF) on 2009-11-17. ^ a b Strandberg, Rune (2020). "An Analytic Approach to the Modeling of Multijunction Solar Cells".

Can a multi-junction solar cell exceed the Shockley-Queisser limit?

A multi-junction cell, however, can exceed that limit. The theoretical performance of a solar cell was first studied in depth in the 1960s, and is today known as the Shockley–Queisser limit. The limit describes several loss mechanisms that are inherent to any solar cell design.