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1030 PV IN ARCHITECTURE<br />

Figure 22.36 Alwitra Evalon ® roofing foil with amorphous silicon cells. Reproduced with permission<br />

by O.Ö. Energiesparverband<br />

Figure 22.37 Schüco 1.9 kWp roof profile system with transparent modules in the Energy Forum<br />

Center in Bad Oeyenhausen (D). This mounting system can also be used in (difficult) horizontal<br />

situations. Reproduced with permission by BEAR Architecten T. Reijenga<br />

the electrical efficiency of a system. Typical efficiencies of today’s commercially available<br />

solar modules are shown in Table 22.1.<br />

22.3.2.1 Solar cell materials<br />

There are several types of solar cell materials: monocrystalline (single crystal) silicon,<br />

polycrystalline silicon (both discussed in Chapters 6 and 7), amorphous silicon<br />

(Chapter 12), copper indium gallium diselenide (CuInGaSe 2 ) (Chapter 13), and cadmium

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