Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
Subnanometric metal clusters (CLs) are particles smaller than 2 nm in diameter, consisting of groups of atoms with well-defined compositions and geometry. In these species, quantum effects are responsible for totally new chemical, optical and electronic properties, such as magnetism, photoluminescence or catalytic activity [1].
They show high catalytic and photocatalytic activities in oxidations [2,3,4] and hydrogen production [5]. A photovoltaic cell can be fabricated in which the working electrode is composed of a transparent and conducting film of silver nanofibers supporting silver CLs. By doing so, any Schottky barrier is eliminated, and the only interfaces remaining are of the type metal-metal of the same element. In addition, the small size of the CLs favours any charge transfer to occur through quantum tunnelling mechanism. Thus, this system reunites the conditions which might yield a better incident photon-to-electron conversion efficiency and help overcome the limitations of the current photovoltaic systems composed of an indium tin oxide electrode sensitized by quantum dots and/or organic dyes.
In this presentation, the results of the preliminary measurements with this photovoltaic scheme are shown.
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