Color Plates

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FIGURE 1.1 Chronology of improvements in PV-cell efficiencies according to device technology since 1976. (Courtesy of NREL Image Gallery, http://www.nrel.gov/ncpv/images.)

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FIGURE 1.2 Examples of commercially available PV systems for producing electricity in a variety of applications: (a) fixed-tilt PV arrays; (b) polycrystalline PV modules; (c) fixed-tilt PV arrays; (d) thin-film PV roof shingles; (e) concentrating PV on 2-axis tracker; (f) building-integrated PV. (Courtesy of NREL Image Gallery, http://images.nrel.gov.)

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