Figure 1 shows the absorption coefficient for several direct and indirect bandgap semiconductors. Analyses these figure in term of indirect bandgap materials. ABSORPTION COEFFICIENT (cm) 106 105 104 103 10² 10 0.2 3 GaP 2 Si 0.6 PHOTON ENERGY (CV) 1.5 1 GaAs InP Figure 1 In0.53 Ga0.47As 1.4 WAVELENGTH (μm) 0.7 1.8
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