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(Color online) (a) Room-temperature photoluminescence spectra (left-hand side) of -type doped at different concentrations. Also shown are the corresponding absorption spectra (right-hand side). (b) An energy diagram of doped illustrating the corresponding optical transition thresholds.
Integrated emission intensity of the near-band-edge transition of -type as a function of the doping concentration.
(Color online) (a) Optical band gap vs electron density for films as obtained from experimental data (closed circles) and a computed result (solid curves). A solid curve refers to the theory for polar semiconductors including self-energy shift which is cited from Ref. 1. Also shown by open squares are the PL Stokes shifts (b).
(Color online) Experimental linewidth of the near-band-edge transition of -type as a function of the doping concentration. Also shown are the theoretical thermal broadening and broadening due to random impurity concentration fluctuations.
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