Exploring many-body phenomena: biexciton generation and auger recombination in Ag<sub>2</sub>S-based nanocrystals
The optoelectronic properties of Ag<sub>2</sub>S nanocrystals with different surface passivation treatments have been investigated using femtosecond transient absorption spectroscopy. Plain Ag<sub>2</sub>S nanocrystals and improved surface-passivated nanostructures were studied under different pump fluences and photon energies. Surface passivation significantly sharpens excitonic resonances, reducing defect-assisted recombination. Transient absorption spectroscopy reveals that the excited state dynamics are dominated by trapping and exciton recombination at low exciton densities, while fluence dependence studies reveal significant contributions from biexcitons and Auger recombination in all samples at high exciton densities. Notably, surface-passivated nanostructures exhibit faster multi-exciton recombination dynamics, highlighting the impact of effective surface passivation.
Authors
- Saül Garcia‐Orrit (ORCID: https://orcid.org/0000-0002-3289-7065)
- Juan Cabanillas‐González (ORCID: https://orcid.org/0000-0002-9926-3833)
- Víctor Vega‐Mayoral (ORCID: https://orcid.org/0000-0001-8626-0775)
- Beatriz H. Juárez (ORCID: https://orcid.org/0000-0003-1704-060X)
- Emma Martín Rodríguez (ORCID: https://orcid.org/0000-0002-2190-8312)
- Peijiang Wang (ORCID: https://orcid.org/0009-0002-9559-4536)
- Rafael Morales-Márquez (ORCID: https://orcid.org/0009-0001-4745-9842)
Institutions
- Madrid Institute for Advanced Studies (ES)
- IMDEA Nanoscience (ES)
- Instituto de Ciencia de Materiales de Madrid (ES)
- Instituto Ramón y Cajal de Investigación Sanitaria (ES)
- Universidad Autónoma de Madrid (ES)
Publication Details
- Journal
- Nanoscale
- Published
- 2025-01-01
- DOI
- https://doi.org/10.1039/d5nr00511f
- Citations
- 4
- Primary Topic
- Quantum Dots Synthesis And Properties
- Type
- article
- Field-Weighted Citation Impact
- 2.07
Funders
- Ministerio de Ciencia, Innovación y Universidades
- Royal Society
- Royal Society of Chemistry
- European Commission
- China Scholarship Council
- Ministerio de Ciencia e Innovación
- Agencia Estatal de Investigación