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. 2022 Nov 8;22(22):8883–8891. doi: 10.1021/acs.nanolett.2c02965

Figure 4.

Figure 4

Bound exciton complexes associated with neutral and ionized donors. (a) Schematic of donor freeze-out, ionization, and dynamical deionization. Yellow arrow, laser excitation; dashed arrow, carrier relaxations. (b) Table illustrating different quasi-particle (excited and ground) states, relevant PL emissions, and optical transitions for different Fermi level positions. The notation |···⟩ indicates the quasi-particle state: D, donor ion; e, electron; h, hole; X, exciton; VAC, vacuum state. The red words above → indicate the names for PL emissions defined in Figure 2a. (c) Red: energy shift between X0 and X0′ (ΔE = EX0 – EX0′) as a function of the laser power. Blue: PL intensity of defect-bound excitons (D0) as a function of the laser power at Vg = −3 V, after removing the linear background.