Abstract
Metal oxide nanocrystals are emerging as an extremely versatile material for addressing many of the current challenging demands of energy-conversion technology. Being able to exploit their full potential is not only an advantage but also a scientific and economic ambition for a more sustainable energy development. In this direction, the photodoping of metal oxide nanocrystals is a very notable process that allows accumulating multiple charge carriers per nanocrystal after light absorption. The reactivity of the photodoped electrons is currently the subject of an intense study. In this context, the possibility to extract efficiently the stored electrons could be beneficial for numerous processes, from photoconversion and sunlight energy storage to photocatalysis and photoelectrochemistry. In this work we provide, via oxidative titration and optical spectroscopy, evidence for multi-electron transfer processes from photodoped Sn : In2O3 nanocrystals to a widely employed organic electron acceptor (F4TCNQ). The results of this study disclose the potential of photodoped electrons to drive chemical reactions involving more than one electron.
Highlights
Metal oxide (MO) semiconductors are inorganic materials of great interest in the eld of optoelectronic applications for energy-related technology.[1]
The ability to modulate their charge carrier density through aliovalent substitutional doping and post-synthesis methods boosts the implementation of doped MO nanocrystals (NCs), such as Sn-doped In2O3 (Indium Tin Oxide [ITO]) NCs.[4,5,6,7]
Photodoping, a light-driven charge accumulation of electrons induced by multiple absorption events of high-energy photons, emerged as a contactless and promising tool to promote the aDepartment of Nanochemistry, Istituto Italiano di Tecnologia, Via Morego 30, 16163
Summary
Metal oxide (MO) semiconductors are inorganic materials of great interest in the eld of optoelectronic applications for energy-related technology.[1]. Via oxidative titration and optical spectroscopy, we investigate the ability of ITO NCs to provide multiple transfers of electrons accumulated a er the photodoping process.
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