Print Email Facebook Twitter Solid-State Infrared Upconversion in Perylene Diimides Followed by Direct Electron Injection Title Solid-State Infrared Upconversion in Perylene Diimides Followed by Direct Electron Injection Author Felter, K.M. (TU Delft ChemE/Opto-electronic Materials) Fravventura, Maria C. (External organisation) Koster, Emma (External organisation) Abellon, R.D. (TU Delft ChemE/O&O groep) Savenije, T.J. (TU Delft ChemE/Opto-electronic Materials) Grozema, F.C. (TU Delft ChemE/Opto-electronic Materials) Date 2020 Abstract 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 (TiO2) in a trilayer device consisting of a triplet sensitizer (fluorinated zinc phthalocyanine), triplet acceptor (methyl subsituted perylenediimide), and smooth polycrystalline TiO2. 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 TiO2 from the upconverted singlet excited state. To reference this document use: http://resolver.tudelft.nl/uuid:9eab8ce7-e244-4bb6-a861-221911f01c92 DOI https://doi.org/10.1021/acsenergylett.9b02361 ISSN 2380-8195 Source ACS Energy Letters, 5 (1), 124-129 Part of collection Institutional Repository Document type journal article Rights © 2020 K.M. Felter, Maria C. Fravventura, Emma Koster, R.D. Abellon, T.J. Savenije, F.C. Grozema Files PDF acsenergylett.9b02361.pdf 1.47 MB Close viewer /islandora/object/uuid:9eab8ce7-e244-4bb6-a861-221911f01c92/datastream/OBJ/view