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HISTORICAL OVERVIEW 473<br />

Solar<br />

radiation<br />

N<br />

23.5°<br />

W<br />

E<br />

S<br />

Solar cells<br />

3D secondaries<br />

Polar tracking axis<br />

Parabolic trough<br />

Figure 11.17 A two-stage concentrator permitting 300X concentration with one-axis tracking.<br />

Reprinted from Sol. Energy, 56, Brunotte M, Goetzberger A, Blieske U, 285–300, © (2002), with<br />

permission from Elsevier Science<br />

40<br />

35<br />

30<br />

Efficiency<br />

[%]<br />

25<br />

20<br />

15<br />

10<br />

5<br />

0<br />

Figure 11.18<br />

1977<br />

1979<br />

1981<br />

GaAs and multijunction cells<br />

Silicon cells<br />

GaAs and multijunction modules<br />

Silicon modules<br />

1983<br />

1984<br />

1986<br />

1988<br />

Year<br />

1990<br />

1992<br />

1994<br />

1996<br />

1998<br />

2000<br />

Record concentrator cell and module efficiencies

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