Figure 4
PL spectra from sample H202 before and after etching that removed 400 nm. (a) T = 18 K, Pexc = 0.1 W/cm2; (b) T = 100 K, Pexc = 10−4 W/cm2. Free exciton (FE), donor-bound exciton (DBE), two-electron satellites (TES) lines and their LO phonon replicas are identified at T = 18 K. The thin dashed lines in (b) show RL1 and YL1 band shapes simulated by using Eq. (1) with Imax = 2.77 × 109 (RL1) and Imax = 7.85 × 108 (YL1). The rest parameters are the same as in the caption to Fig. 2. The × symbols show the sum of the simulated bands.
