Artikel

Tiwari, Dhananjay ; Scheuerlein, Martin Christoph ; Jaber, Mahdi ; Gautier, Eric ; Vila, Laurent ; Attané, Jean-Philippe ; Schöbitz, Michael ; Massebœuf, Aurelien ; Hellmann, Tim ; Hofmann, Jan P. ; Ensinger, Wolfgang ; Fruchart, Olivier (2023)
Electrical characterization of the azimuthal anisotropy of (NixCo1−x)B-based ferromagnetic nanotubes.
In: Journal of Magnetism and Magnetic Materials, 575
doi: 10.1016/j.jmmm.2023.170715
Artikel, Bibliographie

Liang, Liang ; Feng, Quanchen ; Wang, Xingli ; Hübner, Jessica ; Gernert, Ulrich ; Heggen, Marc ; Wu, Longfei ; Hellmann, Tim ; Hofmann, Jan P. ; Strasser, Peter (2023)
Electroreduction of CO₂ on Au(310)@Cu High‐index Facets.
In: Angewandte Chemie International Edition, 62 (12)
doi: 10.1002/anie.202218039
Artikel, Bibliographie

Maheu, Clément ; Hellmann, Tim ; Prabowo, Chandra ; Jaegermann, Wolfram ; Hofmann, Jan P. ; Mayer, Thomas (2023)
Photoelectron spectroscopy of Co-evaporated and spin-coated LiTFSI-doped Spiro-OMeTAD reveals the interface energetics inside a MAPI-based perovskite solar cell.
In: The Journal of Physical Chemistry C, 127 (43)
doi: 10.1021/acs.jpcc.3c04968
Artikel, Bibliographie

Gupta, Navneet Kumar ; Palenicek, Phillip ; Nortmeyer, Lucas ; Meyer, Gregor Maurice ; Schäfer, Timo ; Hellmann, Tim ; Hofmann, Jan P. ; Rose, Marcus (2022)
Modulating catalytic selectivity by base addition in aqueous reductive amination of 1,6-hexanediol using Ru/C.
In: ACS Sustainable Chemistry & Engineering, 10 (44)
doi: 10.1021/acssuschemeng.2c04301
Artikel, Bibliographie

Chen, Guoxing ; Zhao, Zhijun ; Widenmeyer, Marc ; Frömling, Till ; Hellmann, Tim ; Yan, Ruijuan ; Qu, Fangmu ; Homm, Gert ; Hofmann, Jan P. ; Feldhoff, Armin ; Weidenkaff, Anke (2021)
A comprehensive comparative study of CO2-resistance and oxygen permeability of 60 wt % Ce0.8M0.2O2– (M = la, Pr, Nd, Sm, Gd) - 40 wt % La0.5Sr0.5Fe0.8Cu0.2O3– dual-phase membranes.
In: Journal of Membrane Science, 639
doi: 10.1016/j.memsci.2021.119783
Artikel, Bibliographie

Abzieher, Tobias ; Feeney, Thomas ; Schackmar, Fabian ; Donie, Yidenekachew J. ; Hossain, Ihteaz M. ; Schwenzer, Jonas A. ; Hellmann, Tim ; Mayer, Thomas ; Powalla, Michael ; Paetzold, Ulrich W. (2021)
From groundwork to efficient solar cells: on the importance of the substrate material in co‐evaporated perovskite solar cells.
In: Advanced Functional Materials, 31 (42)
doi: 10.1002/adfm.202104482
Artikel, Bibliographie

Hellmann, Tim ; Das, Chittaranjan ; Abzieher, Tobias ; Schwenzer, Jonas A. ; Wussler, Michael ; Dachauer, Ralph ; Paetzold, Ulrich W. ; Jaegermann, Wolfram ; Mayer, Thomas (2020)
The Electronic Structure of MAPI‐Based Perovskite Solar Cells: Detailed Band Diagram Determination by Photoemission Spectroscopy Comparing Classical and Inverted Device Stacks.
In: Advanced Energy Materials, 10 (42)
doi: 10.1002/aenm.202002129
Artikel, Bibliographie

Scheuerlein, Martin Christoph ; Muench, Falk ; Kunz, Ulrike ; Hellmann, Tim ; Hofmann, Jan P. ; Ensinger, Wolfgang (2020)
Electroless Nanoplating of Iridium: Template‐Assisted Nanotube Deposition for the Continuous Flow Reduction of 4‐Nitrophenol.
In: ChemElectroChem, 7 (16)
doi: 10.1002/celc.202000811
Artikel, Bibliographie

Das, Chittaranjan ; Wussler, Michael ; Hellmann, Tim ; Mayer, Thomas ; Zimmermann, Iwan ; Maheu, Clément ; Nazeeruddin, Mohammad Khaja ; Jaegermann, Wolfram (2020)
Surface, Interface, and Bulk Electronic and Chemical Properties of Complete Perovskite Solar Cells: Tapered Cross-Section Photoelectron Spectroscopy, a Novel Solution.
In: ACS Applied Materials & Interfaces, 12 (36)
doi: 10.1021/acsami.0c11484
Artikel, Bibliographie

Das, Chittaranjan ; Kot, Malgorzata ; Hellmann, Tim ; Wittich, Carolin ; Mankel, Eric ; Zimmermann, Iwan ; Schmeisser, Dieter ; Khaja Nazeeruddin, Mohammad ; Jaegermann, Wolfram (2020)
Atomic Layer-Deposited Aluminum Oxide Hinders Iodide Migration and Stabilizes Perovskite Solar Cells.
In: Cell Reports Physical Science, 1 (7)
doi: 10.1016/j.xcrp.2020.100112
Artikel, Bibliographie

Mortan, Claudiu ; Hellmann, Tim ; Buchhorn, Moritz ; Melzi d'Eril, Marco ; Clemens, Oliver ; Mayer, Thomas ; Jaegermann, Wolfram (2020)
Preparation of methylammonium lead iodide (CH 3 NH 3 PbI 3 ) thin film perovskite solar cells by chemical vapor deposition using methylamine gas (CH 3 NH 2 ) and hydrogen iodide gas.
In: Energy Science & Engineering, 8 (9)
doi: 10.1002/ese3.734
Artikel, Bibliographie

Wussler, Michael ; Mayer, Thomas ; Das, Chittaranjan ; Mankel, Eric ; Hellmann, Tim ; Prabowo, Chandra ; Zimmermann, Iwan ; Nazeeruddin, Mohammad Khaja ; Jaegermann, Wolfram (2020)
Tapered Cross‐Section Photoelectron Spectroscopy of State‐of‐the‐Art Mixed Ion Perovskite Solar Cells: Band Bending Profile in the Dark, Photopotential Profile Under Open Circuit Illumination, and Band Diagram.
In: Advanced Functional Materials, 30 (27)
doi: 10.1002/adfm.201910679
Artikel, Bibliographie

Chakraborty, Biswarup ; Kalra, Shweta ; Beltrán‐Suito, Rodrigo ; Das, Chittaranjan ; Hellmann, Tim ; Menezes, Prashanth W. ; Driess, Matthias (2020)
A Low‐Temperature Molecular Precursor Approach to Copper‐Based Nano‐Sized Digenite Mineral for Efficient Electrocatalytic Oxygen Evolution Reaction.
In: Chemistry – An Asian Journal, 15 (6)
doi: 10.1002/asia.202000022
Artikel, Bibliographie

Mortan, Claudiu ; Hellmann, Tim ; Clemens, Oliver ; Mayer, Thomas ; Jaegermann, Wolfram (2019)
Preparation of Methylammonium Tin Iodide (CH 3 NH 3 SnI 3 ) Perovskite Thin Films via Flash Evaporation.
In: physica status solidi (a), 216 (18)
doi: 10.1002/pssa.201900209
Artikel, Bibliographie

Hellmann, Tim ; Wussler, Michael ; Das, Chittaranjan ; Dachauer, Ralph ; El-Helaly, Islam ; Mortan, Claudiu ; Mayer, Thomas ; Jaegermann, Wolfram (2019)
The difference in electronic structure of MAPI and MASI perovskites and its effect on the interface alignment to the HTMs spiro-MeOTAD and CuI.
In: Journal of Materials Chemistry C, 7 (18)
doi: 10.1039/C8TC06332J
Artikel, Bibliographie

Das, C. ; Wussler, Michael ; Hellmann, Tim ; Mayer, T. ; Jaegermann, W. (2018)
In situ XPS study of the surface chemistry of MAPI solar cells under operating conditions in vacuum.
In: Physical Chemistry Chemical Physics, 20 (25)
doi: 10.1039/C8CP01259H
Artikel, Bibliographie

Dissertation

Hellmann, Tim (2021)
Advanced Understanding of the Electronic Properties of Perovskite Solar Cells: Contact Formation, Band Energy Diagrams and involved Surface Photovoltages.
Technische Universität Darmstadt
doi: 10.26083/tuprints-00019803
Dissertation, Erstveröffentlichung, Verlagsversion