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. 2019 Jul 16;116(31):15356–15361. doi: 10.1073/pnas.1903001116

Fig. 5.

Fig. 5.

The cross-section of the photovoltaic cell is shown here. The InGaAs active layer has a bandgap of 0.75 eV. The rear Au layer acts as the reflective mirror. Electrons are collected by the front electrode grid, while holes are collected by the rear Au layer.