Figure 4From: Photovoltaic Ge/Si quantum dot detectors operating in the mid-wave atmospheric window (3 to 5 μ m)Valence band diagram with the involved hole transitions in the QDIP. With delta-doping planes for (a) zero bias and (b) U b ≠ 0. The closed circles show the states occupied with a hole. The arrows indicate the hole flow.Back to article page