Porous Semiconductors - Science and Technology (PSST) and related Conferences, PSST 2014 Home Page

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Water splitting on a quantum dot sensitized porous silicon photocathode
Soundarrajan Chandrasekaran, Thomas Macdonald, Yatin Mange, Nicolas Voelcker, Thomas Nann

Date: 2014-03-13 09:00 AM – 12:20 PM
Last modified: 2014-02-01


Solar fuels have attracted considerable attention as an alternative energy vector in the context of the dwindling supplies of the planet’s non-renewable resources. The first step in solar fuel generation is often a photo-catalytic water-splitting. Although a very large amount of work has been dedicated to optimise the photo-oxidation process (mostly based on titania), the development of highly efficient photocathodes is lagging behind. In this paper, we report on the fabrication and characterisation of a nano-structured photocathode using environmentally benign and abundant materials such as indium phosphide QDs and a bio-inspired Fe2S2(CO)6 catalyst on a robust p-type porous silicon (pSi) electrode. Our hybrid electrode system produced a photocurrent density of -1.2 mA/cm2 with hydrogen evolution at low bias potentials.

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