Silicon-based solar cells Characteristics and production processes ...

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Silicon-based solar cells – characteristics and production processes dependence of the effect of the cell’s rear contact engineering on the absorption and photogeneration of the charges in the longwave radiation range is presented in Figure 9. Fig. 9. External quantum efficiency of solar cells differing only in the construction and production technology of the rear contact. 2.5 Construction and production process of crystalline silicon solar cells Silicon solar cells are constructed of a few basic elements which allow not only for a conversion of the electromagnetic radiation into direct current but also to lead the current to the outer circuit. Figure 10 shows a construction scheme of a classic silicon solar cell made in the screen process technology, produced by most of the global solar cell manufacturers. 27
Silicon-based solar cells – characteristics and production processes Fig. 10. Scheme of a solar cell with a given thickness value of particular construction elements. Most of the global producers manufacture crystalline silicon solar cells with the technological process schematically presented in Figure 11. The applied base material are boron-doped monocrystalline silicon plates Cz-Si, type p, 200 µm thick, with the surface crystallographic orientation of (100), the resistivity of ~ 1 Ωcm and the charge carrier lifetime of τ ~ 20 µs. In the case of polycrystalline plates, the value of τ is usually lower, the crystallographic orientation is determined by the orientation of particular grains, and the remaining parameters are identical with those of the Cz- Si plates. Fig. 11. Scheme of the technological process of silicon solar cell production. 28
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Silicon-based solar cells Characteristics and production processes ...

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