Lead-based hybrid organic-inorganic perovskites have established themselves as revolutionary semiconductor materials for photovoltaic applications with efficiencies exceeding 25%, despite being very cheap and fast to produce by simple solution processing. Nonetheless, the central, highly toxic Pb atom hampers widespread commercial applications, furthermore slowed down by the inherent instability of these materials in ambient atmosphere.
My research focuses on designing and characterising new photovoltaic materials based on the same ns2 electronic configuration of the Pb2+ atom, studying thin film formation, electronic and optical characteristics and device performance by means of theoretical and experimental approaches to overcome the problems of regular Pb-based perovskites while retaining their optoelectronic properties.
Silver-Bismuth Based 2D Double Perovskites (4FPEA)4AgBiX8 (X = Cl, Br, I): Highly Oriented Thin Films with Large Domain Sizes and Ultrafast Charge-Carrier Localization Rik Hooijer, Andreas Weis, Alexander Biewald, Maximilian T. Sirtl, Julian Malburg, Rico Holfeuer, Simon Thamm, Amir Abbas Yousefi Amin, Marcello Righetto, Achim Hartschuh, Laura M. Herz, Thomas Bein, Adv. Optical Mater. 2022 [link]
2D/3D Hybrid Cs2AgBiBr6 Double Perovskite Solar Cells: Improved Energy Level Alignment for Higher Contact-Selectivity and Large Open Circuit Voltage Maximilian T. Sirtl, Rik Hooijer, Melina Armer, Firouzeh G. Ebadi, Mahdi Mohammadi, Clément Maheu, Andreas Weis, Bas T. van Gorkom, Sebastian Häringer, René A. J. Janssen, Thomas Mayer, Vladimir Dyakonov, Wolfgang Tress, Thomas Bein, Adv. Energy Mater. 2022 [link]
1,10-Phenanthroline as an Efficient Bifunctional Passivating Agent for MAPbI3 Perovskite Solar Cells Ali Buyruk, Dominic Blätte, Marcella Günther, Manuel A. Scheel, Nicolai F. Hartmann, Markus Döblinger, Andreas Weis, Achim Hartschuh, Peter Müller-Buschbaum, Thomas Bein, Tayebeh Ameri, ACS Appl. Mater. Interfaces 2021 [link]
Formation of Stable 2D Methylammonium Antimony Iodide Phase for Lead-Free Perovskite-Like Solar Cells, Nadja Giesbrecht*, Andreas Weis*, Thomas Bein, J. Phys. Energy 2020 [link]
Accessing Tetravalent Transition‐Metal Nitridophosphates through High‐Pressure Metathesis, Simon D Kloß, Sophia Wandelt, Andreas Weis, Wolfgang Schnick, Angew. Chem. Int. Ed. 2018 [link]
High-Pressure Metathesis of the M1–xPO3+4xN1–4x (x ≈ 0.05) and M0.75PO4 (M = Zr, Hf) Orthophosphates, Simon D Kloß, Andreas Weis, Sophia Wandelt, Wolfgang Schnick, Inorg. Chem. 2018 [link]