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Solid-State Infrared Upconversion in Perylene Diimides Followed by Direct Electron Injection

[Image: see text] In this contribution we demonstrate a solid-state approach to triplet–triplet annihilation upconversion for application in a solar cell device in which absorption of near-infrared light is followed by direct electron injection into an inorganic substrate. We use time-resolved micro...

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Detalles Bibliográficos
Autores principales: Felter, Kevin M., Fravventura, Maria C., Koster, Emma, Abellon, Ruben D., Savenije, Tom J., Grozema, Ferdinand C.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2019
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6958839/
https://www.ncbi.nlm.nih.gov/pubmed/31956696
http://dx.doi.org/10.1021/acsenergylett.9b02361
Descripción
Sumario:[Image: see text] In this contribution we demonstrate a solid-state approach to triplet–triplet annihilation upconversion for application in a solar cell device in which absorption of near-infrared light is followed by direct electron injection into an inorganic substrate. We use time-resolved microwave photoconductivity experiments to study the injection of electrons into the electron-accepting substrate (TiO(2)) in a trilayer device consisting of a triplet sensitizer (fluorinated zinc phthalocyanine), triplet acceptor (methyl subsituted perylenediimide), and smooth polycrystalline TiO(2). Absorption of light at 700 nm leads to the almost quantitative generation of triplet excited states by intersystem crossing. This is followed by Dexter energy transfer to the triplet acceptor layer where triplet annihilation occurs and concludes by injection of an electron into TiO(2) from the upconverted singlet excited state.