Figure 3. a Working principle of tandem solar cells, b Schematic drawing of plot of sunlight energy per time, surface area and wavelength over wavelength: the grey area represents the incoming sunlight energy per time and surface area, the green area the energy per time and surface area that is converted by perovskite solar cell and the blue area the one that is harvested by silicon solar cell, c Band structure with valence band (VB) and conduction band (CB) of perovskite (green) and silicon (blue): UV and visible light energy are higher than the band gap energy of perovskite, whereas IR light energy is not, but it is higher than the band gap energy of silicon [10,14].

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Approaching Tandem Solar Cells in Chemistry Classes

Philipp Lanfermann, Thomas Waitz, Mona Christin Maaß

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