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Charge Carrier Dynamics in Photocatalytic Hybrid Semiconductor-Metal Nanorods: Crossover from Auger Recombination to Charge Transfer.
Ben-Shahar, Yuval; Philbin, John P; Scotognella, Francesco; Ganzer, Lucia; Cerullo, Giulio; Rabani, Eran; Banin, Uri.
Afiliación
  • Ben-Shahar Y; The Institute of Chemistry and Center for Nanoscience and Nanotechnology , The Hebrew University of Jerusalem , Jerusalem 91904 , Israel.
  • Philbin JP; Department of Chemistry , University of California and Lawrence Berkeley National Laboratory , Berkeley , California 94720-1460 , United States.
  • Scotognella F; IFN-CNR, Dipartimento di Fisica , Politecnico di Milano , Milan 20133 , Italy.
  • Ganzer L; IFN-CNR, Dipartimento di Fisica , Politecnico di Milano , Milan 20133 , Italy.
  • Cerullo G; IFN-CNR, Dipartimento di Fisica , Politecnico di Milano , Milan 20133 , Italy.
  • Rabani E; Department of Chemistry , University of California and Lawrence Berkeley National Laboratory , Berkeley , California 94720-1460 , United States.
  • Banin U; The Sackler Institute for Computational Molecular and Materials Science , Tel Aviv University , Tel Aviv , Israel 69978.
Nano Lett ; 18(8): 5211-5216, 2018 08 08.
Article en En | MEDLINE | ID: mdl-29985622
ABSTRACT
Hybrid semiconductor-metal nanoparticles (HNPs) manifest unique, synergistic electronic and optical properties as a result of combining semiconductor and metal physics via a controlled interface. These structures can exhibit spatial charge separation across the semiconductor-metal junction upon light absorption, enabling their use as photocatalysts. The combination of the photocatalytic activity of the metal domain with the ability to generate and accommodate multiple excitons in the semiconducting domain can lead to improved photocatalytic performance because injecting multiple charge carriers into the active catalytic sites can increase the quantum yield. Herein, we show a significant metal domain size dependence of the charge carrier dynamics as well as the photocatalytic hydrogen generation efficiencies under nonlinear excitation conditions. An understanding of this size dependence allows one to control the charge carrier dynamics following the absorption of light. Using a model hybrid semiconductor-metal CdS-Au nanorod system and combining transient absorption and hydrogen evolution kinetics, we reveal faster and more efficient charge separation and transfer under multiexciton excitation conditions for large metal domains compared to small ones. Theoretical modeling uncovers a competition between the kinetics of Auger recombination and charge separation. A crossover in the dominant process from Auger recombination to charge separation as the metal domain size increases allows for effective multiexciton dissociation and harvesting in large metal domain HNPs. This was also found to lead to relative improvement of their photocatalytic activity under nonlinear excitation conditions.
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Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Idioma: En Revista: Nano Lett Año: 2018 Tipo del documento: Article País de afiliación: Israel

Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Idioma: En Revista: Nano Lett Año: 2018 Tipo del documento: Article País de afiliación: Israel