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If we assume a bound exciton binding energy of - 3 meV then the 0.795 eV peak would be separated from the band edge by 6 meV. The effective mass donor binding energy in In0.53 Ga.0.47 As is 3 meV; however, from luminescence measurements a binding energy of -7 meV is deduced.  We therefore assign the 0.795 eV peak to a donor-to-valence band transition.£¿
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