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Publications 2022

M.Kroll, S. D. Öz, Z. Zhang, R. Ji, T. Schramm, T. Antrack, Y. Vaynzof, S. Olthof, and Karl Leo, Insights into the evaporation behaviour of FAI: material degradation and consequences for perovskite solar cells. Sust. Energy Fuels, 6, 3230-3239 (2022).

K.O. Brinkmann, T. Becker, F. Zimmermann, C. Kreusel, T. Gahlmann, M. Theisen, T. Haeger, S.Olthof, C. Tückmantel, M. Günster, T. Maschwitz, F. Göbelsmann, C. Koch, D. Hertel, P. Caprioglio, F. Peña-Camargo, L. Perdigón-Toro, A. Al-Ashouri, L. Merten, A. Hinderhofer, L. Gomell, S. Zhang, F. Schreiber, S. Albrecht, K. Meerholz, D. Neher, M. Stolterfoht, T. Riedl, Perovskite–Organic Tandem Solar Cells with Indium Oxide Interconnect. Nature, 604 (7905), 280–286 (2022).

M. Elnaggar, L. Frolova, A. Gordeeva, M. Ustinova, H. Laurenzen, A. Akkuratov, S. Nikitenko, E. Solov’eva, S. Luchkin, Y. Fedotov, S. Tsarev, N. Dremova, K. Stevenson, S. Bredikhin, S. Olthof, S. Aldoshin, P. Troshin, Improving Stability of Perovskite Solar Cells Using Fullerene-Polymer Composite Electron Transport Layer. Synth. Met., 286, 117028 (2022).

S. Sutorius, D. van Gerven, S. Olthof, B. Rasche, J. Bruns, Polycations Stabilized by Borosulfates: [Au3Cl4][B(S2O7)2] and the One Dimensional Metal [Au2Cl4][B(S2O7)2](SO3). Chem. – A Eur. J. 2022, 202200004, 1

S. Apergi, Ch. Koch, G. Brocks, S. Olthof, S. Tao, Decomposition of Organic Perovskite Precursors on MoO3: Role of Halogen and Surface Defects. ACS Appl. Mater. Interfaces, 14, 34208 (2022)

J. Suo, B. Yang, J. Jeong, T. Zhang, S. Olthof, F. Gao, M. Grätzel, G. Boschloo, A. Hagfeldt,  Interfacial Engineering from Material to Solvent: A Mechanistic Understanding on Stabilizing α-Formamidinium Lead Triiodide Perovskite Photovoltaics. Nano Energy, 94, 106924 (2022).

M. Ustinova, S. D. Babenko, S. Y. Luchkin, F. Talalaev, D. Anokhin, S. Olthof, P. Troshin,  Experimental Evaluation of Indium (I) Iodide as Lead-Free Perovskite-Inspired Material for Photovoltaic Applications. J. Mater. Chem. C, 1, 207890, 3777 (2022).

I. Schmidt, S. Olthof, H. Xu, K. Meerholz, Phosphine Oxide Additives for High‐Brightness Inorganic Perovskite Light‐Emitting Diodes. Adv. Opt. Mater., 10, 2101602 (2022).

Publications 2021

B. Yang,  J. Suo, F. Di Giacomo, S. Olthof, D. Bogachuk, Y. Kim, X. Sun, L.Wagner, F. Fu, S. Zakeeruddin, A. Hinsch, M. Grätzel, A. Di Carlo, A. Hagfeldt, Interfacial Passivation Engineering of Perovskite Solar Cells with Fill Factor over 82% and Outstanding Operational Stability on N-i-p Architecture. ACS Energy Lett., 3916 (2021).

L. Schmidt-Mende, V. Dyakonov, S. Olthof, et al., Roadmap on Organic–Inorganic Hybrid Perovskite Semiconductors and Devices. APL Mater., 9, 109202 (2021).

N. Bartek, V. Shvartsman, H. Bouyanfif, A. Schmitz, G. Bacher, S. Olthof, S. Sirotinskaya, N. Benson, D. Lupascu, Band Gap of Pb(Fe0.5Nb0.5)O3 Thin Films Prepared by Pulsed Laser Deposition. Materials, 14 (22), 6841 (2021). 

J. Zhang, W. Zhao, S. Olthof, S. Liu, Defects in CsPbX3 Perovskite: From Understanding to Effective Manipulation for High-Performance Solar Cells. Small Methods, 2100725, 1 (2021)

S. Olthof, The impact of UV photoelectron spectroscopy on the field of organic optoelectronics – a retrospective, Adv. Opt. Mater. 9, 2100227 (2021).

H. Schwartz, H. Laurenzen, A. Marzouk, M. Runkel, K. Brinkmann, D. Rogalla, T. Riedl, S. Ashhab, S. Olthof, Band-Gap Tuning in All-Inorganic CsPbxSn1-xBr3 Perovskites. ACS Appl. Mater. Interfaces, 13, 4203 (2021).

S. Tsarev, S. Olthof, A. Boldyreva, S. Aldoshin, K. Stevenson, P. Troshin, Reactive Modification of Zinc Oxide with Methylammonium Iodide Boosts the Operational Stability of Perovskite Solar Cells. Nano Energy, 83, 105774 (2021).

A. Haseloer, L. Denkler, R. Jordan, M. Reimer, S. Olthof, I. Schmidt, K. Meerholz, G. Hörner, and A. Klein. 2021. Ni, Pd, and Pt Complexes of a Tetradentate Dianionic Thiosemicarbazone-Based O^N^N^S Ligand. Dalton Transactions, 50, 4311 (2021).

M. Bauer, H. Zhu, T. Baumeler, Y. Liu, F. Eickemeyer, C. Lorenz, E. Mena‐Osteritz, D. Hertel, S. Olthof, S. Zakeeruddin, K. Meerholz, M. Grätzel, P. Bäuerle,Cyclopentadiene‐Based Hole‐Transport Material for Cost‐Reduced Stabilized Perovskite Solar Cells with Power Conversion Efficiencies Over 23%. Adv. Energy Mater., 11 , 2003953 (2021).

S. Kremer, I. Ober, V. Greussing, H. Kopacka, H. Gallmetzer, B. Trübenbacher, D. Demmel, S. Olthof, H. Huppertz, H.A. Schwartz, Modulating the Optical Characteristics of Spiropyran@Metal-Organic Framework Composites as a Function of Spiropyran Substitution. Langmuir 2021. Langmuir, 37 (25), 7834–7842 (2021).

R. Basse, S. Vanicek, T. Höfer, H. Kopacka, K. Wurst, T. Müller, H.A. Schwartz, S. Olthof, L. Casper, M. Nau, R. Winter, M. Podewitz, B. Bildstein, Cationic Cycloheptatrienyl Cyclopentadienyl Manganese Sandwich Complexes: Tromancenium Explored with High-Power LED Photosynthesis. Organometallics, 40 (15), 2736–2749 (2021).

Publications 2020

H. Schwartz, H. Laurenzen, S. Kerschbaumer, M. Werker, S. Olthof, H. Kopacka, H. Huppertz, K. Meerholz, U. Ruschewitz, High Fatigue Resistance of a Photochromic Dithienylethene Embedded into the Pores of a Metal–Organic Framework (MOF). Photochem. Photobiol. Sci., 19, 1730 (2020).

N. Afzali, S. Tangestaninejad, R. Keshavarzi, V. Mirkhani, J. Nematollahi, M. Moghadam, I. Mohammadpoor-Baltork, M. Reimer, S. Olthof, A. Klein, S. Gimenez, Hierarchical Ti-Based MOF with Embedded RuO 2 Nanoparticles: A Highly Efficient Photoelectrode for Visible Light Water Oxidation. ACS Sustain. Chem. Eng., 8, 18366 (2020).

T. L. Murrey, D. Hertel, J. Nowak, R. Bruker, T. Limböck, J.-M. Neudörfl, S. Rüth, J. Schelter, S. Olthof, A. Radulescu, A. J. Moulé, K. Meerholz, Investigation of Hierarchical Structure Formation in Merocyanine Photovoltaics, J. Phys. Chem. C 124, 19457 (2020)

K. Wang, Q. Tian, G. Zhao, Z. Jin, S. Olthof, F. Liu, K. Wang, Q. Tian, G. Zhao, J. Wen, J. Huang, C. Gao, Z. Xu, Beach-Chair-Shaped Energy Band Alignment for High-Performance β-CsPbI3 Solar Cells, Cell Reports Phys. Sci. 1, 100180 (2020).

L. Pasqualini, O. Janka, S. Olthof, H. Huppertz, K. Liedl, R. Pöttgen, M. Podewitz, and J. Bruns, Ni[B2(SO4)4] and Co[B2(SO4)4]: Unveiling systematic trends in phyllosilicate analogue borosulfates. Chemistry 26, 17405 (2020).

K. Wang, S. Olthof, W. Subhani, X. Jiang, Y. Cao, L. Duan, H. Wang, M. Du, S. Liu, Novel inorganic electron transport layers for planar perovskite solar cells: Progress and prospective. Nano Energy, 68, 104289 (2020).

X. Wu, L. Zhang, Z. Xu, S. Olthof, X. Ren, Y. Liu, D. Yang, F. Gao, S. Liu, Efficient perovskite solar cells via surface passivation by a multifunctional small organic ionic compound. J. Mater. Chem. A, 8, 8313 (2020).

G. Wu, H. Li, J. Cui, Y. Zhang, S. Olthof, S. Chen, Z. Liu, D. Wang, S. Liu, Solvent Engineering Using a Volatile Solid for Highly Efficient and Stable Perovskite Solar Cells. Adv. Sci., 7, 1903250 (2020).

H. Sahabudeen, H. Qi, M. Ballabio, M. Položij, S. Olthof, R. Shivhare, Y. Jing, S. Park, K. Liu, T. Zhang, J. Ma, B. Rellinghaus, S. Mannsfeld, T. Heine, M. Bonn, E. Cánovas, Z. Zheng, U. Kaiser, R. Dong, X. Feng, Highly Crystalline and Semiconducting Imine‐Based Two‐Dimensional Polymers Enabled by Interfacial Synthesis. Angew. Chemie Int. Ed., 59, 6028 (2020).

H. A. Schwartz, M. Werker, C. Tobeck, R. Christoffels, D. Schaniel, S. Olthof, K. Meerholz, H. Kopacka, H. Huppertz, U. Ruschewitz, Novel Photoactive Spirooxazine Based Switch@MOF Composite Materials. ChemPhoto Chem, 4, 195 (2020).

N. A. Drigo, C. Roldán-Carmona, M. Franckevicius, K. Lin, R. Gegevinius, H. Kim, P. A. Schouwink, A. A. Sutanto, S. Olthof, M. Sohail, K. Meerholz, V. Gulbinas, C. Corminboeuf, S. Paek, M. K. Nazeeruddin, Doped but stable: spirobisacridine hole transporting materials for hysteresis-free and stable perovskite solar cells, J. Am. Chem. Soc. 142, 1792 (2020).

Publications 2019

N. Pourdavoud, T. Haeger, A. Mayer, P. J. Cegielski, A. L. Giesecke, R. Heiderhoff, S. Olthof, S. Zaefferer, I. Shutsko, A. Henkel, D. Becker-Koch, M. Stein, M. Cehovski, O. Charfi, H. H. Johannes, D. Rogalla, M. C. Lemme, M. Koch, Y. Vaynzof, K. Meerholz, W. Kowalsky, H. C. Scheer, P. Görrn, T. Riedl, Room‐Temperature Stimulated Emission and Lasing in Recrystallized Cesium Lead Bromide Perovskite Thin Films. Adv. Mater. 31, 1903717 (2019).

R. C. Shallcross, S. Olthof, K. Meerholz, N. R. Armstrong, Impact of Titanium Dioxide Surface Defects on the Interfacial Composition and Energetics of Evaporated Perovskite Active Layers, ACS Appl. Mater. Interfaces, 11, 32500 (2019).

M. Pantaler, S. Olthof, K. Meerholz, D. C. Lupascu, Bismuth-Antimony mixed double perovskites Cs2AgBi1-xSbxBr6 in solar cells, MRS Adv. 4, 3545 (2019).

R. Kapaev, S. Olthof, I. Zhidkov, E. Kurmaev, K. Stevenson, K. Meerholz P. Troshin, Nickel(II) and Copper(II) Coordination Polymers Derived from 1,2,4,5-Tetraaminobenzene for Lithium-Ion Batteries, Chem. Mater. 31, 5197 (2019).

S. Tao, I. Schmidt, G. Brocks, J. Jiang, I. Tranca, K. Meerholz, and S. Olthof, Absolute energy level positions in tin- and lead-based halide perovskites, Nat. Commun. 10, 2560 (2019).

Tulus, S. Olthof, M. Marszalek, A. Peukert, L. Muscarella, B. Ehrler, O. Vukovic, Y. Galagan, S.  Boehme, E. Von Hauff: Control of Surface Defects in ZnO Nanorod Arrays with thermally-deposited Au nanoparticles for Perovskite Photovoltaics, ACS Appl. Energy Mater. 2, 3736 (2019).

K. Budzinauskas, S. Ewertowski, S. Olthof, K. Meerholz, and P.H.M. Van Loosdrecht, Charge carrier migration and hole extraction from MAPbI3, J. Phys. Conf. Ser. 1220, 012053 (2019).

M. Yavari, F. Ebadi, S. Meloni, Z. Wang, Terry Chien-Jen Yang, S. Sun, H. Schwartz, Z. Wang, B. Niesen, J. Durantini, P. Rieder, K. Tvingstedt, T. Buonassisi, W. Choy, A. Filippetti, T. Dittrich, S. Olthof, J.-P. Correa Baena, and W.Tress, ”How far does the defect tolerance of lead-halide perovskites range? The example of Bi impurities introducing efficient recombination centers”, J. Mater. Chem. A, 7, 23838 (2019).

Publications 2018

F.-J. Kahle, C. Saller, S. Olthof, C. Li, J. Lebert, S. Weiß, E.M. Herzig, S. Hüttner, K. Meerholz, P. Strohriegl, and A. Köhler: „Does Electron Delocalization Influence Charge Separation at Donor–Acceptor Interfaces in Organic Photovoltaic Cells?“ J. Phys. Chem. C, 122, 21792 (2018).

T. Meier, T.P. Gujar, A. Schönleber, S. Olthof, K. Meerholz, S. van Smaalen, F. Panzer, M. Thelakkat, and A. Köhler: „Impact of excess PbI2 on the structure and the temperature dependent optical properties of methylammonium lead iodide perovskites“, J. Mater. Chem. C, 4, 11164 (2018).

Y. Saygili, S. Turren-Cruz, S. Olthof, B. Saes, I. Pehlivan, M. Saliba, K. Meerholz, T.  Edvinsson, S. Zakeeruddin, M. Grätzel, J.P. Correa Baena, A. Hagfeldt, M. Freitag, and W. Tress: “Planar Perovskite Solar Cells with High Open-Circuit Voltage Containing a Supramolecular Iron Complex as Hole Transport Material Dopant”, ChemPhysChem 19, 1363 (2018).

Publications 2017

H.A. Schwartz, S. Olthof, D. Schaniel, K. Meerholz, U. Ruschewitz „Solution-Like Behavior of Photoswitchable Spiropyrans Embedded in Metal–Organic Frameworks”, Inorg. Chem. 56, 13100 (2017).

T. Hu, T. Becker, N. Pourdavoud, J. Zhao, K. O. Brinkmann, R. Heiderhoff, T. Gahlmann, Z. Huang, S. Olthof, K. Meerholz, D. Többens, B. Cheng, Y. Chen, T. Riedl: “Indium‐Free Perovskite Solar Cells Enabled by Impermeable Tin‐Oxide Electron Extraction Layers”, Adv. Mater. 1606656 (2017).

S. Olthof and K. Meerholz: Substrate-dependent electronic structure and film formation of MAPbI3 perovskites, Sci. Rep. 7, 40267 (2017).

K.O. Brinkmann, J. Zhao, N. Pourdavoud, T. Becker, T. Hu, S. Olthof, K. Meerholz,  L.Hoffmann, T. Gahlmann, R. Heiderhoff, M.F. Oszajca, N.A. Luechinger, D. Rogalla, Y. Chen, B. Cheng, and T. Riedl: “Suppressed decomposition of organometal halide perovskites by impermeable electron-extraction layers in inverted solar cells”, Nat. Commun. 8, 13938 (2017).

Publications 2016

S. Olthof: “Research Update: The electronic structure of hybrid perovskite layers and their energetic alignment in devices”. APL Materials, 4 (2016) 091502.

J. Emara, T. Schnier, N. Pourdavoud, T. Riedl, K. Meerholz, and S. Olthof:  “Impact of Film Stoichiometry on the Ionization Energy and Electronic Structure of CH3NH3PbI3 Perovskite”. Advanced Materials 28 (2016) 553.

S. Oez, J. Hebig, E. Jung, T. Singh, A. Lepcha, S. Olthof, J. Flohre; Y. Gao, R.  German, P.H.M.  van Loosdrecht, K. Meerholz, Th. Kirchartz, and S. Mathur: “Zero-dimensional (CH3NH3)3Bi2I9 Perovskite for Optoelectronic Applications”. Solar Energy Materials & Solar Cells, Sol. Energy Mater. Sol. Cells 158 (2016) 195.

Publications pre-2015

A. Lepcha, C. Maccato, A. Mettenboerger, T. Andreu, L. Mayrhofer, M. Walter, S. Olthof, T. Ruoko, A. Klein, M. Moseler, K. Meerholz, J. Morante, D. Barreca, and S. Mathur: “Electrospun Black Titania Nanofibres: Influence of Hydrogen Plasma Induced Disorder on the Electronic Structure and Photoelectrochemical Performance”. J. Phys. Chem. C, 119 (2015) 18835.

C. Poelking,    M. Tietze, C. Elschner, S. Olthof, D. Hertel, B. Baumeier, F. Würthner, K. Meerholz, K. Leo, and  D. Andrienko: “Impact of mesoscale order on open-circuit voltage in organic solar cells“. Nature Materials 14 (2015) 434.

K. X. Steirer, G. A. MacDonald, S. Olthof, J. Gantz, E. L. Ratcliff, A. Kahn, and N. R. Armstrong: “Energy Level Alignment and Morphology of Ag and Au Nanoparticle Recombination Contacts in Tandem Planar Heterojunction Solar Cells”. The Journal of Physical Chemistry C 117 (2013) 22331.

M. L. Tietze, W. Tress, S. Pfützner, C. Schünemann, L. Burtone, M. Riede, K. Leo, K. Vandewal, S. Olthof, P. Schulz, Antoine Kahn. „Correlation of open-circuit voltage and energy levels in zinc-phthalocyanine: C60 bulk heterojunction solar cells with varied mixing ratio.” Physical Review B 88 (2013) 085119.

B. D. Naab, S. Guo, S. Olthof, E. G. B. Evans, P. Wei, G. L. Millhauser, A. Kahn, S. Barlow, S. R. Marder, and Z. Bao: “Mechanistic Study on the Solution-Phase n-Doping of 1,3-Dimethyl-2-aryl-2,3-dihydro-1H-benzoimidazole Derivatives”. Journal of the American Chemical Society 135 (2013) 15018.

G. Ren, C. Schlenker, E. Ahmed, S. Subramaniyan, S.Olthof, A. Kahn, D. Ginger, and S. Jenekhe: „Photoinduced Hole Transfer Becomes Suppressed with Diminished Driving Force in Polymer‐Fullerene Solar Cells While Electron Transfer Remains Active”. Adv. Funct. Mat. 23 (2013) 1238.

S. Olthof, S. Singh, S. K. Mohapatra, S. Barlow, S. R. Marder, B. Kippelen, and A. Kahn: “Passivation of trap states in unpurified and purified C60 and the influence on organic field-effect transistor performance”. Applied Physics Letters 101 (2012) 253303.

S. Olthof, S. Mehraeen, S. Mohapatra, S. Barlow, V. Coropceanu, J.-L. Brédas, S. Marder, and A. Kahn: “Ultra low doping in organic semiconductors: evidence of trap filling”. Physical Review Letters 109 (2012) 176601.

S. Olthof, R. Timmreck, M. Riede, and K. Leo: “Photoelectron spectroscopy investigations of recombination contacts for tandem organic solar cells”. Applied Physics Letters, 110 (2012) 113302.

M. L. Machala, L. Müller-Meskamp, S. Gang, S. Olthof, and K. Leo: “On-substrate polymerization of solution-processed, transparent PEDOT:DDQ thin film electrodes with a hydrophobic polymer matrix”. Organic Electronics, 12 (2011) 1518.

R. Meerheim, S. Olthof,  M. Hermenau, S. Scholz, A. Petrich, N. Tessler, O. Solomeshch, B. Lussem, M. Riede, and K. Leo: “Investigation of C60F36 as non-volatile p-dopant in organic optoelectronic devices”. Journal of Applied Physics, 109 (2011) 103102.

M. Thomschke, S. Hofmann, S. Olthof, M. Anderson, H. Kleemann, M. Schober, B. Lüssem, and K. Leo: “Improvement of voltage and charge balance in inverted top-emitting organic electroluminescent diodes comprising doped transport layers by thermal annealing”, Applied Physics Letters, 98 (2011) 083304.

C. Falkenberg, S. Olthof, R. Rieger, M. Baumgarten, K. Müllen, K. Leo, M. Riede: “The role of energy level matching in organic solar cells - Hexaazatriphenylene hexacarbonitrile as transparent electron transport material”. Solar Energy Materials & Solar Cells 95 (2011) 927.

S. Olthof, J. Meiss, M. K. Riede, B. Lüssem, and K. Leo: “Photoelectron spectroscopy investigation of transparent metal top contacts for organic solar cells”. Thin Solid Films 519 (2011) 1872.

P. Freitag, S. Reineke, S. Olthof, M. Furno, B. Lüssem, and K. Leo: “White top-emitting organic light-emitting diodes with forward directed radiation and high color quality”. Organic Electronics, 11 (2010) 1676.

Th. C. Rosenow, S. Reineke, S. Olthof, M. Furno, B. Lüssem, and K. Leo: “Highly efficient white organic light-emitting diodes based on fluorescent blue emitters”, Journal of Applied Physics, 108 (2010) 113113.

M. Schober, S. Olthof, B. Lüssem, and K. Leo:  “Single carrier devices with electrical doped layers for the characterization of charge-carrier transport in organic thin-films”, Applied Physics Letters, 97 (2010) 013303.

R. Timmreck, S. Olthof, M. K. Riede, and K. Leo: “Highly doped layers as efficient electron-hole conversion contacts for tandem organic solar cells”, Journal of Applied Physics 108 (2010) 033108. 

S. Olthof, W. Tress, R. Meerheim, B. Lüssem , and K. Leo: “Photoelectron spectroscopy study of systematic varied doping concentrations in an organic semiconductor layer using a molecular p-dopant”, Journal of Applied Physics 106 (2009) 103711.

S. Olthof, R. Meerheim, M. Schober, and K. Leo: “Energy level alignment at the interfaces in a multilayer organic light-emitting diode structure”, Physical Review B 79 (2009) 245308.

R. Meerheim, S. Scholz, S. Olthof, G. Schwartz, S. Reineke, K. Walzer, and K. Leo: “Influence of charge balance and exciton distribution on efficiency and lifetime of phosphorescent organic light-emitting devices”, Journal of Applied Physics 104 (2008) 14510.

S. Scholz, Q. Huang, M. Thomschke, S. Olthof, P. Sebastian, K. Walzer, K. Leo, S. Oswald, C. Corten, and D. Kuckling: “Self-doping and partial oxidation of metal-on-organic interfaces for organic semiconductor devices studied by chemical analysis techniques”, Journal of Applied Physics 104 (2008) 104502.

C. Falkenberg, C. Uhrich, S. Olthof, B. Maennig, M. K. Riede, and K. Leo: “Efficient p-i-n type organic solar cells incorporating 1,4,5,8-naphthalenetetracarboxylic dianhydride as transparent electron transport material”, Journal of Applied Physics 104 (2008) 034506.

C. Uhrich, D. Wynands, S. Olthof, M. Riede, K. Leo, S. Sonntag, B. Maennig, and M. Pfeiffer: “Origin of open circuit voltage in planar and bulk heterojunction organic thin-film photovoltaics depending on doped transport layers”, Journal of Applied Physics 104 (2008) 043107.

K. Fehse, S. Olthof, K. Walzer, K. Leo, R. L. Johnson, H. Glowatzki, B. Bröker, and N. Koch: “Energy level alignment of electrically doped hole transport layers with transparent and conductive indium tin oxide and polymer anodes”, Journal of Applied Physics 102 (2007) 073719

Magazine Contributions

Selina Olthof, Den Energieniveaus auf der Spur, Physik Journal (2019)

Lukas Schmidt-Mende, Selina Olthof, Vladimir Dyakonov, Eine Halbleiter-Tinte für die Zukunft, Physik in unserer Zeit (2019)