Print Email Facebook Twitter Hot-electron transfer in quantum-dot heterojunction films Title Hot-electron transfer in quantum-dot heterojunction films Author Grimaldi, G. (TU Delft ChemE/Opto-electronic Materials) Crisp, R.W. (TU Delft ChemE/Opto-electronic Materials) Ten Brinck, Stephanie (Vrije Universiteit Amsterdam) Zapata, Felipe (Vrije Universiteit Amsterdam; Netherlands eScience Center) van Ouwendorp, M. (TU Delft Applied Sciences) Renaud, N. (TU Delft ChemE/Opto-electronic Materials) Kirkwood, N.R.M. (TU Delft ChemE/Opto-electronic Materials) Evers, W.H. (TU Delft BN/Technici en Analisten; Kavli institute of nanoscience Delft) Kinge, S.S. (Toyota Motor Europe) Infante, Ivan (Vrije Universiteit Amsterdam) Siebbeles, L.D.A. (TU Delft ChemE/Opto-electronic Materials) Houtepen, A.J. (TU Delft ChemE/Opto-electronic Materials) Faculty Applied Sciences Date 2018-12-01 Abstract Thermalization losses limit the photon-to-power conversion of solar cells at the high-energy side of the solar spectrum, as electrons quickly lose their energy relaxing to the band edge. Hot-electron transfer could reduce these losses. Here, we demonstrate fast and efficient hot-electron transfer between lead selenide and cadmium selenide quantum dots assembled in a quantum-dot heterojunction solid. In this system, the energy structure of the absorber material and of the electron extracting material can be easily tuned via a variation of quantum-dot size, allowing us to tailor the energetics of the transfer process for device applications. The efficiency of the transfer process increases with excitation energy as a result of the more favorable competition between hot-electron transfer and electron cooling. The experimental picture is supported by time-domain density functional theory calculations, showing that electron density is transferred from lead selenide to cadmium selenide quantum dots on the sub-picosecond timescale. To reference this document use: http://resolver.tudelft.nl/uuid:b56e539c-a971-4338-9cf1-10fec055c919 DOI https://doi.org/10.1038/s41467-018-04623-9 ISSN 2041-1723 Source Nature Communications, 9 (1) Part of collection Institutional Repository Document type journal article Rights © 2018 G. Grimaldi, R.W. Crisp, Stephanie Ten Brinck, Felipe Zapata, M. van Ouwendorp, N. Renaud, N.R.M. Kirkwood, W.H. Evers, S.S. Kinge, Ivan Infante, L.D.A. Siebbeles, A.J. Houtepen Files PDF s41467_018_04623_9.pdf 3.32 MB Close viewer /islandora/object/uuid:b56e539c-a971-4338-9cf1-10fec055c919/datastream/OBJ/view