Improving the performance of p-type photoelectrodes represents a key challenge toward significant advancement in the field of tandem dye-sensitized solar cells. Herein, we demonstrate the application of boron-doped nanocrystalline diamond (B:NCD) thin films, covalently functionalized with a dithienopyrrole-benzothiadiazole push-pull chromophore, as alternative photocathodes. First, a primary functional handle is introduced on H-terminated diamond via electrochemical diazonium grafting. Afterwards, Sonogashira cross-coupling and Cu(i) catalyzed azide-alkyne cycloaddition (CuAAC) reactions are employed to attach the chromophore, enabling the comparison of the degree of surface functionalization and the importance of the employed linker at the diamond-dye interface. X-ray photoelectron spectroscopy shows that surface functionalization via CuAAC results in a slightly higher chromophore coverage compared to the Sonogashira cross-coupling. However, photocurrents and photovoltages, obtained by photoelectrochemical and Kelvin probe measurements, are approximately three times larger on photocathodes functionalized via Sonogashira cross-coupling. Surface functionalization via Sonogashira cross-coupling is thus considered the preferential method for the development of diamond-based hybrid photovoltaics.

Faculty of Electrical Engineering Czech Technical University Prague Technická 2 166 25 Prague 6 Czech Republic

Institute of Physics Czech Academy of Sciences Cukrovarnická 10 162 00 Prague 6 Czech Republic

J Heyrovsky Institute of Physical Chemistry Czech Academy of Sciences Dolejskova 3 18223 Prague 8 Czech Republic

UHasselt Hasselt University Institute for Materials Research IMEC vzw IMOMEC Agoralaan 1 3590 Diepenbeek Belgium

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