Figure 4

Excitonic 1.7 K PL spectra of four Epitronics HVPE samples with various Si doping levels. Lowest spectrum is for undoped sample; next lowest is for sample with N_D-N_A = 5 x 10¹⁶ cm^-3; second from top is for sample with N_D-N_A = 2.5 x 10¹⁷ cm^-3; top spectrum is for sample with N_D-N_A = 4 x 10¹⁷ cm^-3.

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