Photo injection type semiconductor solid state solar energy cell
The photo injection cell has a laminate structure with a substrate base (4) and low impedance collector (3), charge transfer (2), and a photoemitter (1) layers. The collector layer, e.g. of Gd, which lies on the substrate, is of 100 nm to 1000 nm thickness and has a 2-4 eV work function. The charge...
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Zusammenfassung: | The photo injection cell has a laminate structure with a substrate base (4) and low impedance collector (3), charge transfer (2), and a photoemitter (1) layers. The collector layer, e.g. of Gd, which lies on the substrate, is of 100 nm to 1000 nm thickness and has a 2-4 eV work function. The charge transfer layer, e.g. a semiconductor or insulator, is of 50 to 1000 nm thick and has an energy gap of 2-4 eV. The photoemitter layer, e.g. of Au, is highly absorbing with a thickness of 5 nm to 50nm and a work function of 3-5 eV. Incident light on the photo emitter layer produces charge carriers which overcome the barrier and are injected into the charge transfer layer to diffuse in the collector layer. The isotropic quasi elastic scatter rate of the photoemitter is greater than that of the inelastic scatter process, while its thickness is of the same order as that of the free path length of the inelastic scattered process. |
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