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Rational design of a neutral pH functional and stable organic photocathode
Laia Francàs1, Eric Burns, Ludmilla Steier
1Department of Chemistry, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK. lfrancas@ic.ac.uk j.durrant@imperial.ac.uk.
Abstract:
In this work we lay out design guidelines for catalytically more efficient organic photocathodes achieving stable hydrogen production in neutral pH. We propose an organic photocathode architecture employing a NiO hole selective layer, a PCDTBT:PCBM bulk heterojunction, a compact TiO2 electron selective contact and a RuO2 nanoparticle catalyst. The role of each layer is discussed in terms of durability and function. With this strategically designed organic photocathode we obtain stable photocurrent densities for over 5 h and discuss routes for further performance improvement.
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