Tim Hellmann

From Groundwork to Efficient Solar Cells: On the Importance of the Substrate Material in Co‐Evaporated Perovskite Solar Cells

Tobias Abzieher, Thomas Feeney, Fabian Schackmar et al. · Advanced Functional Materials · 2021 · 105 citations · Full text

Optical Materials, Engineering, Organic Solar Cell +20

Thermal Stability and Cation Composition of Hybrid Organic–Inorganic Perovskites

Jonas A. Schwenzer, Tim Hellmann, Bahram Abdollahi Nejand et al. · ACS Applied Materials & Interfaces · 2021 · 93 citations

<i>In situ</i> XPS study of the surface chemistry of MAPI solar cells under operating conditions in vacuum

Chittaranjan Das, Michael Wussler, Tim Hellmann et al. · Physical Chemistry Chemical Physics · 2018 · 76 citations

The Electronic Structure of MAPI‐Based Perovskite Solar Cells: Detailed Band Diagram Determination by Photoemission Spectroscopy Comparing Classical and Inverted Device Stacks

Tim Hellmann, Chittaranjan Das, Tobias Abzieher et al. · Advanced Energy Materials · 2020 · 51 citations · Full text

Engineering, Halide Perovskites, Photovoltaic Devices +16

Atomic Layer-Deposited Aluminum Oxide Hinders Iodide Migration and Stabilizes Perovskite Solar Cells

Chittaranjan Das, Tim Hellmann, Carolin Wittich et al. · Cell Reports Physical Science · 2020 · 48 citations · Full text