Andreas Falkenstein

Contact Information

eMail: website@afalkenstein.de
based in Baesweiler, Germany.

Work & Education

Research Center Juelich - Project Administration Juelich, scientific coworker, since 2023
RWTH Aachen University - Institute of Physical Chemistry - Chair of Physical Solid-state Chemistry, scientific coworker, 2012–2022
PhD in physical solid-state chemistry, RWTH Aachen University, 2017 [ Thesis ]
Studies in chemistry (Dipl.-Chem.), RWTH Aachen University, until 2012

Networks

LinkedIn: [in] Profile
orcid: 0000-0002-4992-0823
ResearchGate: R^G Profile

Publications

• Kinetics, thermodynamics, and catalysis of the cation incorporation into GeO₂, SnO₂, and (Sn_xGe_1−x)O₂ during suboxide molecular beam epitaxy
  W. Chen, K. Egbo, J. Kler, A. Falkenstein, J. Lähnemann, O. Bierwagen, APL Mater. 2025, 13, 011107
  DOI: 10.1063/5.0243858
• Variable-Range Hopping Conduction in Amorphous, Non-Stoichiometric Gallium Oxide
  P. Hein, T. Romstadt, F. Draber, J. Ryu, T. Böger, A. Falkenstein, M. Kim, M. Martin, Adv. Electron. Mater. 2024, 2400407
  DOI: 10.1002/aelm.202400407
• Phase-selective growth of κ- vs β-Ga₂O₃ and (In_xGa_1−x)₂O₃ by In-mediated metal exchange catalysis in plasma-assisted molecular beam epitaxy
  A. Ardenghi, O. Bierwagen, J. Lähnemann, E. Luna, J. Kler, A. Falkenstein, M. Martin, A. Sacchi, P. Mazzolini, APL Materials 2024, 12, 10
  DOI: 10.1063/5.0226050
• Engineering shallow and deep level defects in κ-Ga₂O₃ thin films: comparing metal-organic vapour phase epitaxy to molecular beam epitaxy and the effect of annealing treatments
  P. Mazzolini, J.B. Varley, A. Parisini, A. Sacchi, M. Pavesi, A. Bosio, M. Bosi, L. Seravalli, B.M. Janzen, M.N. Marggraf, N. Bernhardt, M.R. Wagner, A. Ardenghi, O. Bierwagen, A. Falkenstein, J. Kler, R.A. De Souza, M. Martin, F. Mezzadri, C. Borelli, R. Fornari, Materials Today Physics 2024, 45, 101463
  DOI: 10.1016/j.mtphys.2024.101463
• Molecular Beam Epitaxy of β-(In_xGa_1-x)₂O₃ on β-Ga₂O₃ (010): Compositional Control, Layer Quality, Anisotropic Strain Relaxation, and Prospects for Two-Dimensional Electron Gas Confinement
  P. Mazzolini, C. Wouters, M. Albrecht, A. Falkenstein, M. Martin, P. Vogt, O. Bierwagen, ACS Applied Materials & Interfaces 2024, 16, 12
  DOI: 10.1021/acsami.3c19095
• Acceptor and compensating donor doping of single crystalline SnO (001) films grown by molecular beam epitaxy and its perspectives for optoelectronics and gas-sensing
  K. Egbo, J. Lähnemann, A. Falkenstein, J. Varley, O. Bierwagen, Appl. Phys. Lett. 2023, 122, 122101
  DOI: 10.1063/5.0130935
• Pre‐Programmed Rod‐Shaped Microgels to Create Multi‐Directional Anisogels for 3D Tissue Engineering
  D.L. Braunmiller, S. Babu, D.B. Gehlen, M. Seuß, T. Haraszti, A. Falkenstein, J. Eigen, L. De Laporte, J.J. Crassous, Adv. Func. Mater. 2022, 32, 2202430
  DOI: 10.1002/adfm.202202430
• Toward controllable Si-doping in oxide molecular beam epitaxy using a solid SiO source: Application to β-Ga₂O₃
  A. Ardenghi, O. Bierwagen, A. Falkenstein, G. Hoffmann, J. Lähnemann, M. Martin, P. Mazzolini, Appl. Phys. Lett. 2022, 121, 042109
  DOI: 10.1063/5.0087987
• Anisotropic Microgels Show Their Soft Side
  A.C. Nickel, T. Kratzenberg, S. Bochenek, M.M. Schmidt, A.A. Rudov, A. Falkenstein, I.I. Potemkin, J.J. Crassous, W. Richtering, Langmuir 2022, 38, 5063–5080
  DOI: 10.1021/acs.langmuir.1c01748
• Transition between bipolar and abnormal bipolar resistive switching in amorphous oxides with a mobility edge
  C. Ader, A. Falkenstein, M. Martin, Scientific Reports 2021, 11, 14384
  DOI: 10.1038/s41598-021-93777-6
• Isotopic study of Raman active phonon modes in β-Ga₂O₃
  B.M. Janzen, P. Mazzolini, R. Gillen, A. Falkenstein, M. Martin, H. Tornatzky, J. Maultzsch, O. Bierwagen, M.R. Wagner, J. Mater. Chem. C 2021, 9, 2311-2320
  DOI: 10.1039/D0TC04101G
• Offcut-related step-flow and growth rate enhancement during (100) β-Ga₂O₃ homoepitaxy by metal-exchange catalyzed molecular beam epitaxy (MEXCAT-MBE)
  P. Mazzolini, A. Falkenstein, Z. Galazka, M. Martin, O. Bierwagen, Appl. Phys. Lett. 2020, 117, 222105
  DOI: 10.1063/5.0031300
• A quantitative analysis of two-fold electrical conductivity relaxation behaviour in mixed proton–oxide-ion–electron conductors upon hydration
  A. Falkenstein, R.A. De Souza, W.A. Meulenberg, M. Martin, Phys. Chem. Chem. Phys. 2020, 22, 25032-25041
  DOI: 10.1039/D0CP03264F
• An innovative approach to design SOFC air electrode materials: high entropy La_1-xSr_x(Co,Cr,Fe,Mn,Ni)O_3-δ (x = 0, 0.1, 0.2, 0.3) perovskites synthesized by the sol–gel method
  J. Dąbrowa, A. Olszewska, A. Falkenstein, C. Schwab, M. Szymczak, M. Zajusz, M. Moździerz, A. Mikuła, K. Zielińska, K. Berent, T. Czeppe, M. Martin, K. Świerczek, J. Mater. Chem. A 2020, 8, 24455-24468
  DOI: 10.1039/D0TA06356H
• Substrate-orientation dependence of β-Ga₂O₃ (100), (010), (001), and (-201) homoepitaxy by indium-mediated metal-exchange catalyzed molecular beam epitaxy (MEXCAT-MBE)
  P. Mazzolini, A. Falkenstein, C. Wouters, R. Schewski, T. Markurt, Z. Galazka, M. Martin, M. Albrecht, O. Bierwagen, APL Mater. 2020, 8, 011107
  DOI: 10.1063/1.5135772
• Transport kinetics of hydrogen permeable lanthanum tungstate [ download ] [ LaTeX template adapted from kfiles.de ]
  A. Falkenstein, PhD thesis 2017, RWTH Aachen University, Aachen, Germany
  DOI: 10.18154/RWTH-2017-02136
• Chemical relaxation experiments on mixed conducting oxides with large stoichiometry deviations
  A. Falkenstein, D.N. Mueller, R.A. De Souza, M. Martin, Solid State Ionics 2015, 280, 66-73
  DOI: 10.1016/j.ssi.2015.07.023

Conferences

• Batterieforum, 2025, Berlin, Germany (Participant).
• Batterieforum, 2024, Berlin, Germany (Participant).
• International Battery Production Conference, 2023, Brunswick, Germany (Participant).
• Advanced Battery Power, 2023, Aachen, Germany (Participant).
• Bunsen Colloquium 'New Horizons in Solid State Ionics', 2022, Aachen, Germany (Conference organisation).
• 17th International Conference on Diffusion in Solids and Liquids, 2021, Digital(/Malta) (Oral presentation).
• 16th International Conference on Diffusion in Solids and Liquids, 2019, Athens, Greece (Invited oral presentation).
• 22nd International Conference on Solid State Ionics, 2019, Pyeongchang, Korea (Oral presentation).
• 10th Joint Korean-German Conference ‘Engineering for our Future!’, 2018, Aachen, Germany (Conference organisation).
• The 9th International Symposium on Materials in External Fields, 2018, Seoul, Korea (Participant).
• Bunsentagung, 2018, Hanover, Germany (Oral presentation).
• 21st International Conference on Solid State Ionics, 2017, Padua, Italy (Oral presentation).
• 20th International Conference on Solid State Ionics, 2015, Keystone, USA (Poster presentation).
• Inorganic Membranes Summer School, 2013, Valencia, Spain (Poster presentation).