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MATERIALS ISSUES RELATED TO GaInP/GaAs/Ge SOLAR CELLS 385<br />

2<br />

1<br />

Lattice mismatch<br />

0<br />

−1<br />

−2 × 10 −3<br />

Peak separation<br />

[arcsec]<br />

400<br />

200<br />

0<br />

Cu Ka radiation<br />

(400) reflection<br />

Thick epilayer<br />

No substrate tilt<br />

Coherent<br />

Relaxed<br />

−200<br />

−400<br />

0.49<br />

0.50<br />

0.51<br />

0.52<br />

0.53<br />

0.54<br />

Composition x of Ga x In 1−x P<br />

(a)<br />

4<br />

2<br />

10 −2 8<br />

6<br />

Semicoherent<br />

b = 5.65 Å/√2<br />

n = 0.33<br />

Lattice mismatch<br />

4<br />

2<br />

10 −3 8<br />

6<br />

4<br />

Coherent<br />

10 −4 2<br />

8<br />

6<br />

10 1 10 2 10 3 10 4<br />

Layer thickness<br />

[Å]<br />

(b)<br />

Figure 9.13 (a) A plot of θ versus x for Ga x In 1−x P on GaAs; (b) Critical misfit versus<br />

layer thickness

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