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Direct Plasmon-Driven Photoelectrocatalysis

Harnessing the energy from hot charge carriers is an emerging research area with the potential to improve energy conversion technologies.1−3 Here we present a novel plasmonic photoelectrode architecture carefully designed to drive photocatalytic reactions by efficient, nonradiative plasmon decay into hot carriers. In contrast to past work, our architecture does not utilize a Schottky junction, the commonly used building block to collect hot carriers. Instead, we observed large photocurrents from a Schottky-free junction due to direct hot electron injection from plasmonic gold nanoparticles into the reactant species upon plasmon decay. The key ingredients of our approach are (i) an architecture for increased light absorption inspired by optical impedance matching concepts,4 (ii) carrier separation by a selective transport layer, and (iii) efficient hot-carrier generation and injection from small plasmonic Au nanoparticles to adsorbed water molecules. We also investigated the quantum efficiency of hot elect...

Authors:   Hossein Robatjazi; Shah Mohammad Bahauddin; Chloe Doiron; Isabell Thomann
Journal:   Nano Letters
Year:   2015
DOI:   10.1021/acs.nanolett.5b02453
Publication date:   06-Aug-2015
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