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Metal-Insulator-Semiconductor Anodes for Ultrastable and Site-Selective Upconversion Photoinduced Electrochemiluminescence

Abstract : Photoinduced electrochemiluminescence (PECL) allows the electrochemically assisted conversion of low-energy photons into high-energy photons at an electrode surface. This concept is expected to have important implications, however, it is dramatically limited by the stability of the surface, impeding future developments. Here, a series of metal-insulator-semiconductor (MIS) junctions, using photoactive n-type Si (n-Si) as a light absorber covered by a few-nanometer-thick protective SiOx/metal (SiOx/M, with M=Ru, Pt, and Ir) overlayers are investigated for upconversion PECL of the model co-reactant system involving the simultaneous oxidation of tris(bipyridine)ruthenium(II) and tri-n-propylamine. We show that n-Si/SiOx/Pt and n-Si/SiOx/Ir exhibit high photovoltages and record stabilities in operation (35 h for n-Si/SiOx/Ir) for the generation of intense PECL with an anti-Stokes shift of 218 nm. We also demonstrate that these surfaces can be employed for spatially localized PECL. These unprecedented performances are extremely promising for future applications of PECL.
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Contributor : Laurent Jonchère Connect in order to contact the contributor
Submitted on : Friday, June 17, 2022 - 9:42:59 AM
Last modification on : Friday, August 5, 2022 - 2:54:52 PM



Yiran Zhao, Julie Descamps, Soraya Ababou-Girard, Jean-Francois Bergamini, Lionel Santinacci, et al.. Metal-Insulator-Semiconductor Anodes for Ultrastable and Site-Selective Upconversion Photoinduced Electrochemiluminescence. Angewandte Chemie International Edition, Wiley-VCH Verlag, 2022, 61 (20), pp.e202201865. ⟨10.1002/anie.202201865⟩. ⟨hal-03657525⟩



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