Koch, Norbert - Helmholtz‐Zentrum Berlin für Materialien und Energie GmbH -

研究领域

Inorganic/organic hybrid systems Combining the advantages of inorganic and organic semiconductors is the focus of this research activity. The high absorption cross-section of organic materials reducing device thickness and material consumption is combined with inorganic transparent electrodes that provide significantly higher conductivity than organic materials. Electronic structure of organic single crystals This research activity utitlizes the advantages of a newly developed electron analyzer to determine the electronic structure of organic single crystals. It is a close collaboration with the university of Uppsala (groups of S. Svennson and N. Mårtensson), VG Scienta, the University Würzburg, and the development team at the HZB (R. Ovsannykov, M. Gorgoi). The high transmission of the instrument allows experiments at very low photon flux at which the radiation sensitive organic single crystals can be investigated.

近期论文

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Caprioglio, P.; Zu, F.; Wolff, C.M.; Prieto, J.A.M.; Stolterfoht, M.; Becker, P.; Koch, N.; Unold, T.; Rech, B.; Albrecht, S.; Neher, D.: High open circuit voltages in pin-type perovskite solar cells through strontium addition. Sustainable Energy & Fuels 3 (2019), p. 550-563 doi:10.1039/C8SE00509E Chen, M.-T.; Hofmann, O.; Gerlach, A.; Bröker, B.; Bürker, C.; Niederhausen, J.; Hosokai, T.; Zegenhagen, J.; Vollmer, A.; Rieger, R.; Müllen, K.; Schreiber, F.; Salzmann, I.; Koch, N.; Zojer, E.; Duhm, S.: Energy-level alignment at strongly coupled organic-metal interfaces. Journal of Physics / Condensed Matter 31 (2019), p. 194002/1-10 doi:10.1088/1361-648X/ab0171 Futscher, M.; Schultz, T.; Frisch, J.; Ralaiarisoa, M.; Metwalli, E.; Nardi, M.V.; Müller-Buschbaum, P.; Koch, N.: Electronic properties of hybrid organic/inorganic semiconductor pn-junctions. Journal of Physics / Condensed Matter 31 (2019), p. 064002/1-8 doi:10.1088/1361-648X/aaf310 Park, S.; Schultz, T.; Han, A.; Aljarb, A.; Xu, X.; Beyer, P.; Opitz, A.; Ovsyannikov, R.; Li, L.-J.; Meissner, M.; Yamaguchi, T.; Kera, S.; Amsalem, P.; Koch, N.: Electronic band dispersion determination in azimuthally disordered transition-metal dichalcogenide monolayers. Communications Physics 2 (2019), p. 68/1-6 doi:10.1038/s42005-019-0166-0 Schultz, T.; Frey, N.; Hantanasirisakul, K.; Park, S.; May, S.; Shenoy, V.; Gogotsi, Y.; Koch, N.: Surface Termination Dependent Work Function and Electronic Properties of Ti3C2TxMXene. Chemistry of Materials 31 (2019), p. 6590-6597 doi:10.1021/acs.chemmater.9b00414 Stolterfoht, M.; Caprioglio, P.; Wolff, C.; Márquez, J.A.; Nordmann, J.; Zhang, S.; Rothhardt, D.; Hörmann, U.; Amir, Y.; Redinger, A.; Kegelmann, L.; Zu, F.; Albrecht, S.; Koch, N.; Kirchartz, T.; Saliba, M.; Unold, T.; Neher, D.: The impact of energy alignment and interfacial recombination on the internal and external open-circuit voltage of perovskite solar cells. Energy & Environmental Science 12 (2019), p. 2778-2788 doi:10.1039/c9ee02020a Wang, Q.; Ligorio, G.; Schlesinger, R.; Diez-Cabanes, V.; Cornil, D.; Garmshausen, Y.; Hecht, S.; Cornil, J.; List-Kratochvil, E.J.W.; Koch, N.: Switching the Electronic Properties of ZnO Surfaces with Negative T-Type Photochromic Pyridyl-dihydropyrene Layers and Impact of Fermi Level Pinning. Advanced Materials Interfaces 6 (2019), p. 1900211/1-10 doi:10.1002/admi.201900211 Zu, F.; Amsalem, P.; Egger, D.; Wang, R.; Wolff, C.; Fang, H.; Loi, M.; Neher, D.; Kronik, L.; Duhm, S.; Koch, N.: Constructing the Electronic Structure of CH3NH3PbI3 and CH3NH3PbBr3 Perovskite Thin Films from Single-Crystal Band Structure Measurements. Journal of Physical Chemistry Letters 10 (2019), p. 601-609 doi:10.1021/acs.jpclett.8b03728 Bär, M.; Schnabel, T.; Ahlsmeier, J.-H.; Krause, S.; Koch, N.; Wilks, R.G.; Ahlswede, E.: CdS/low-band-gap kesterite thin-film solar cell absorber heterojunction: Energy level alignment and dominant recombination process. ACS Applied Energy Materials 1 (2018), p. 475-482 doi:10.1021/acsaem.7b00071 Fu, K.; Wang, R.; Katase, T.; Ohta, H.; Koch, N.; Duhm, S.: Stoichiometric and Oxygen-Deficient VO2 as Versatile Hole Injection Electrode for Organic Semiconductors. ACS Applied Materials & Interfaces 10 (2018), p. 10552-10559 doi:10.1021/acsami.8b00026 Kyndiah, A.; Ablat, A.; Guyot-Reeb, S.; Schultz, T.; Zu, F.; Koch, N.; Amsalem, P.; Chiodini, S.; Yilmaz Alic, T.; Topal, Y.; Kus, M.; Hirsch, L.; Fasquel, S.; Abbas, M.: A Multifunctional Interlayer for Solution Processed High Performance Indium Oxide Transistors. Scientific Reports 8 (2018), p. 10946/1-7 doi:10.1038/s41598-018-29220-0 Niederhausen, J.; Zhang, Y.; Cheenicode Kabeer, F.; Garmshausen, Y.; Schmidt, B.; Li, Y.; Braun, K.; Hecht, S.; Tkatchenko, A.; Koch, N.; Hla, S.: Subtle Fluorination of Conjugated Molecules Enables Stable Nanoscale Assemblies on Metal Surfaces. The Journal of Physical Chemistry C 122 (2018), p. 18902-18911 doi:10.1021/acs.jpcc.8b03398 Park, S.; Mutz, N.; Schultz, T.; Blumenstengel, S.; Han, A.; Aljarb, A.; Li, L.-J.; List-Kratochvil, E.; Amsalem, P.; Koch, N.: Direct determination of monolayer MoS2 and WSe2 exciton binding energies on insulating and metallic substrates. 2D Materials 5 (2018), p. 025003/1-8 doi:10.1088/2053-1583/aaa4ca Pulvirenti, F.; Wegner, B.; Noel, N.; Mazzotta, G.; Hill, R.; Patel, J.; Herz, L.; Johnston, M.; Riede, M.; Snaith, H.; Koch, N.; Barlow, S.; Marder, S.: Modification of the fluorinated tin oxide/electron-transporting material interface by a strong reductant and its effect on perovskite solar cell efficiency. Molecular Systems Design and Engineering 3 (2018), p. 741-747 doi:10.1039/c8me00031j Ralaiarisoa, M.; Salzmann, I.; Zu, F.; Koch, N.: Effect of Water, Oxygen, and Air Exposure on CH3NH3PbI3¿xClx Perovskite Surface Electronic Properties. Advanced Electronic Materials 4 (2018), p. 1800307/1-8 doi:10.1002/aelm.201800307 Ravishankar, S.; Gharibzadeh, S.; Roldán-Carmona, C.; Grancini, G.; Lee, Y.; Ralaiarisoa, M.; Asiri, A.; Koch, N.; Bisquert, J.; Nazeeruddin, M.: Influence of Charge Transport Layers on Open-Circuit Voltage and Hysteresis in Perovskite Solar Cells. Joule 2 (2018), p. 788-798 doi:10.1016/j.joule.2018.02.013 Schultz, T.; Niederhausen, J.; Schlesinger, R.; Sadofev, S.; Koch, N.: Impact of surface states and bulk doping level on hybrid inorganic/organic semiconductor interface energy levels. Journal of Applied Physics 123 (2018), p. 245501/1-5 doi:10.1063/1.5036579 Shamieh, B.; Anselmo, A.; Vogel, U.; Lariou, E.; Hayes, S.; Koch, N.; Frey, G.: Correlating the effective work function at buried organic/metal interfaces with organic solar cell characteristics. Journal of Materials Chemistry C 6 (2018), p. 8060-8068 doi:10.1039/c8tc02381f Timpel, M.; Li, H.; Nardi, M.; Wegner, B.; Frisch, J.; Hotchkiss, P.; Marder, S.; Barlow, S.; Brédas, J.-L.; Koch, N.: Electrode Work Function Engineering with Phosphonic Acid Monolayers and Molecular Acceptors: Charge Redistribution Mechanisms. Advanced Functional Materials 28 (2018), p. 1704438/1-12 doi:10.1002/adfm.201704438 Timpel, M.; Li, H.; Nardi, M.; Wegner, B.; Frisch, J.; Hotchkiss, P.; Marder, S.; Barlow, S.; Brédas, J.; Koch, N.: Correction: Electrode Work Function Engineering with Phosphonic Acid Monolayers and Molecular Acceptors: Charge Redistribution Mechanisms. Advanced Functional Materials 28 (2018), p. 1870098/1 doi:10.1002/adfm.201801349