Plasmonic metal/semiconductor heterostructures exhibit unique optoelectronic properties and many applications in energy harvesting, photodetectors, photocatalysts, and optoelectronic devices have been identified. To investigate the plasmon-induced hot-carriers dynamics at the metal/semiconductor interface is a great challenge and understanding the physics behind the hot-carrier transfer dynamics is currently a n important research topic. Numerous studies of hot-electron transfer processes have been published, however, the dynamics of plasmon-induced hot-hole transfer remains largely unclear and only few examples have been presented. Investigation on hot-hole-driven systems is needed to improve our understanding. Herein, we fabricate the gold/p-type cuprous oxide (Au/p-Cu2O) heterostructures and observe the plasmon-induced hot-hole transfer from Au nanoparticles to the valence band of p-Cu2O using ultrafast transient absorption spectroscopy (TAS). Compared with pure Au nanoparticle, an enhanced excited state hole absorption (HA) is clearly observed from the Au/p-Cu2O two-dimensional TAS map. The enhancement is attribute to the hot-hole collection in the valence band of p-Cu2O. We further observed a faster hot-electrons relaxation of Au/p-Cu2O compared with Au nanoparticles which is attribute to a parallel competing relaxation path that enable hot-electrons to be diverted into the valence band of p-Cu2O. The energy schematic mechanism of plasmon-induced hot-hole transfer at Au/p-Cu2O interface will be discussed.

Ultrafast dynamics of plasmon-induced hot-hole transfer in Au/p-Cu2O heterostructures

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.