Photogenerated charge collection on diamond electrodes with covalently linked chromophore monolayers

0524953 - FZÚ 2021 RIV GB eng J - Journal Article
Raymakers, J. - Artemenko, Anna - Verstraeten, F. - Krýsová, Hana - Čermák, Jan - Nicley, S. S. - Lopez-Carballeira, D. - Kromka, Alexander - Haenen, K. - Kavan, Ladislav - Maes, W. - Rezek, B.
Photogenerated charge collection on diamond electrodes with covalently linked chromophore monolayers.
Electrochimica acta. Roč. 337, Mar (2020), s. 1-15, č. článku 135762. ISSN 0013-4686. E-ISSN 1873-3859
R&D Projects: GA MŠMT LM2015087; GA MŠMT(CZ) EF16_013/0001821
Institutional support: RVO:68378271 ; RVO:61388955
Keywords : surface functionalization * sonogashira cross-coupling * monolayers * photoelectrochemistry
OECD category: Condensed matter physics (including formerly solid state physics, supercond.); Physical chemistry (UFCH-W)
Impact factor: 6.901, year: 2020
Method of publishing: Limited access
https://doi.org/10.1016/j.electacta.2020.135762

B:NCD is a promising p-type photoelectrode in dye-sensitized solar cells. One method of diamond surface functionalization using stable carbon-carbon bonds involves the electrochemical grafting of diazonium salts. Here, we establish functionalization of B:NCD electrodes by a monolayer of ethynylphenyl molecules using sterically hindered 4 (trimethylsilyl)ethynylbenzenediazonium tetrafluoroborate. Both the density and structural orientation of the grafted layer are investigated by ARXPS, confirming the presence of covalently grafted monolayers. After removal of the trimethylsilyl protective groups, the resulting ethynyl functionalities are employed to immobilize organic donor-acceptor chromophores via Sonogashira crosscoupling reactions. Correlation between the density of the molecular layer and photocurrents/photovoltage provides better understanding of the charge generation and recombination pathways in diamond-organic photoelectrochemical cells.
Permanent Link: http://hdl.handle.net/11104/0309169