Figure 2. a Perovskite crystal structure ABX₃: Element A in dark grey, B in black and X in light grey (cubic structure is shown, but can also be tetragonal and orthorhombic), b Working principle of perovskite solar cells: (i) Formation of excitons after light absorption by the perovskite layer (green), (ii) diffusion of charge carriers, (iii) transport of electrons and holes to the electrodes (black) by electron transport layer (pink) and by hole transport layer (red), respectively [13].

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Approaching Tandem Solar Cells in Chemistry Classes

Philipp Lanfermann, Thomas Waitz, Mona Christin Maaß

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