ArticleThe journal of physical chemistry. C, Nanomaterials and interfaces2026
Burstein-Moss-Driven Exciton Dynamics in Degenerately Doped ZnO Quantum Dots.
Article in The journal of physical chemistry. C, Nanomaterials and interfaces, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Zinc oxide (ZnO) is a wide-band gap semiconductor with high exciton binding energy and is promising for future optoelectronics. Degenerate doping in ZnO quantum dots (QDs) enables tunable localized surface plasmon resonance (LSPR) in the IR region, but its impact on exciton dynamics remains unexplored. Here, we employ transient absorption spectroscopy to probe exciton dynamics in aluminum-doped ZnO (AZO) QDs. Excitation above the band gap generates hot excitons that relax via thermalization, Auger recombination, and stimulated emission, along with band gap renormalization. The presence of free charge carriers in the conduction band (CB) due to degenerate doping screens Coulomb exciton interactions that leads to suppression of biexciton formation and reduction in Auger recombination lifetime. Despite complete bleaching of ground-state absorption, reminiscent of zero-threshold gain in precharged QDs, no optical gain is achieved in AZO QDs due to doping-induced nonradiative pathways. Our findings highlight how the Burstein-Moss (BM) effect shapes exciton dynamics in degenerately doped wide-band gap QDs.
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