1. M. M. May and W. Jaegermann. Combining experimental and computational methods to unravel the dynamical structure of photoelectrosynthetic interfaces, Current Opinion in Electrochemistry 34 (2022), p. 100968. DOI:10.1016/j.coelec.2022.100968. Preprint.
  2. M. M. May and K. Rehfeld. Negative Emissions as the New Frontier of Photoelectrochemical CO2 Reduction, Advanced Energy Materials (2022), p. 2103801. DOI:10.1063/5.0060700.


  1. M. Kölbach, K. Rehfeld, and M. M. May. Efficiency Gains for Thermally Coupled Solar Hydrogen Production in Extreme Cold, Energy & Environmental Science 14 (2021), p. 4410-4417, Communication. DOI:10.1039/d1ee00650a. Open access.
  2. A. Paszuk, O. Supplie, S. Brückner,  E. Barrigón, M. M. May, M. Nandy, A. Gieß, A. Dobrich, P. Kleinschmidt, I. Rey-Stolle, and T. Hannappel. Atomic surface control of Ge(100) in MOCVD reactors coated with (Ga)As residuals, Applied Surface Science 565 (2021), p. 150513. DOI:10.1016/j.apsusc.2021.150513.
  3. M. Kölbach, C. Özen, O. Höhn, D. Lackner, M. Feifel, F. F. Abdi, M. M. May. Counterbalancing light absorption and ionic transport losses in the electrolyte for integrated solar water splitting with III-V/Si dual-junctions, Applied Physics Letters 119 (2021), p. 083904. DOI:10.1063/5.0060700. Preprint.

2020 and earlier

Peer-reviewed and book chapters:

  1. J. Geiger, M. Sprik, and M. M. May. Band Positions of Anatase (001) and (101) Surfaces in Contact with Water from Density Functional Theory, Journal of Chemical Physics 152(19) (2020) p. 194706. doi:10.1063/5.0004779. Green open access version.
  2. M. M. May, H. Stange, J. Weinrich, T. Hannappel, and O. Supplie. The impact of non-ideal surfaces on the solid-water interaction: a time-resolved adsorption study, SciPost Physics 6(5) (2019) p. 58. doi:10.21468/SciPostPhys.6.5.058. Open access.
  3. M. Mohamed, M. M. May, M. Kanis, M. Brützam, R. Uecker, R. van de Krol, C. Janowitz, and M. Mulazzi. The electronic structure and the formation of polarons in Mo-doped BiVO4 measured by angle-resolved photoemission spectroscopy, RSC Advances 9(27) (2019), pp. 15606-15614. doi:10.1039/c9ra01092k. Open access.
  4. M. M. May and K. Rehfeld. ESD Ideas: Photoelectrochemical carbon removal as negative emission technology, Earth System Dynamics 10(1) (2019), pp. 1-7. doi:10.5194/esd-10-1-2019. Open access.
  5. M. M. May and M. Sprik. Water adsorption on the P-rich GaP(100) surface: Optical spectroscopy from first principles, New Journal of Physics 20(3) (2018), p. 033031. doi:10.1088/1367-2630/aaaf38. Open access.
  6. W.-H. Cheng, M. H. Richter, M. M. May, J. Ohlmann, D. Lackner, F. Dimroth, T. Hannappel, H. A. Atwater, and H.-J. Lewerenz. Monolithic Photoelectrochemical Device for 19% Direct Water Splitting, ACS Energy Letters 3(8) (2018), pp. 1795–1800. doi:10.1021/acsenergylett.8b00920. Green open access version.
  7. M. M. May, H. Döscher, and J. Turner. High-efficiency water splitting systems, In: Integrated Solar Fuel Generators. Ed. by I. Sharp, H. Atwater, and H.-J. Lewerenz. The Royal Society of Chemistry, 2018. Chap. 12, pp. 454–499. isbn: 978-1-78262-555-1. doi:10.1039/9781788010313-00454. Green open access version.
  8. O. Supplie, M. M. May, S. Brückner, N. Brezhneva, T. Hannappel, and E. V. Skorb. In Situ Characterization of Interfaces Relevant for Efficient Photoinduced Reactions, Advanced Materials Interfaces 4(21) (2017), p. 1601118. doi:10.1002/admi.201601118. Green open access version.
  9. M. M. May, D. Lackner, J. Ohlmann, F. Dimroth, R. van de Krol, T. Hannappel, and K. Schwarzburg. On the Benchmarking of Multi-Junction Photoelectrochemical Fuel Generating Devices, Sustainable Energy & Fuels 1(3) (2017), pp. 492–503. doi:10.1039/C6SE00083E. Green open access version.
  10. O. Romanyuk, O. Supplie, T. Susi, M. M. May, and T. Hannappel. Ab initio density functional theory study on the atomic and electronic structure of GaP/Si(001) heterointerfaces, Physical Review B 94(15) (2016), p. 155309. doi:10.1103/PhysRevB.94.155309. Green open access version.
  11. O. Supplie, M. M. May, G. Steinbach, O. Romanyuk, F. Grosse, A. Nägelein, P. Kleinschmidt, S. Brückner, and T. Hannappel. Time-resolved in situ spectroscopy during formation of the GaP/Si(100) heterointerface, Journal of Physical Chemistry Letters 6(3) (2015), pp. 464–469. doi:10.1021/jz502526e. Green open access version.
  12. O. Supplie, M. M. May, P. Kleinschmidt, A. Nägelein, A. Paszuk, S. Brückner, and T. Hannappel. In situ controlled heteroepitaxy of single-domain GaP on As-modified Si(100). APL Materials 3(12), 126110 (2015). doi:10.1063/1.4939005.
  13. O. Supplie, M. M. May, C. Höhn, H. Stange, A. Müller, P. Kleinschmidt, S. Brückner, and T. Hannappel. Formation of GaP/Si(100) heterointerfaces in presence of inherent reactor residuals, ACS Applied Materials & Interfaces 7(18) (2015), pp. 9323–9327. doi:10.1021/acsami.5b02231. Green open access version.
  14. M. M. May, H.-J. Lewerenz, D. Lackner, F. Dimroth, and T. Hannappel. Efficient Direct Solar-to-Hydrogen Conversion by In Situ Interface Transformation of a Tandem Structure, Nature Communications 6 (2015), p. 8286. doi:10.1038/ncomms9286. Open access.
  15. O. Supplie, M. M. May, H. Stange, C. Höhn, H.-J. Lewerenz, and T. Hannappel. Materials for light-induced water splitting: In situ controlled surface preparation of GaPN epilayers grown lattice-matched on Si(100), Journal of Applied Physics 115(11), 113509 (2014), p. 113509. doi:10.1063/1.4869121.
  16. O. Supplie, S. Brückner, O. Romanyuk, H. Döscher, C. Höhn, M. M. May, P. Kleinschmidt, F. Grosse, and T. Hannappel. Atomic scale analysis of the GaP/Si(100) heterointerface by in situ reflection anisotropy spectroscopy and ab initio density functional theory, Physical Review B 90(23) (2014), p. 235301. doi:10.1103/PhysRevB.90.235301. Green open access version.
  17. P. Sippel, O. Supplie, M. M. May, R. Eichberger, and T. Hannappel. Electronic structures of GaP(100) surface reconstructions probed with two-photon photoemission spectroscopy, Physical Review B 89 (2014), p. 165312. doi:10.1103/PhysRevB.89.165312.
  18. A. Ramı́rez, P. Hillebrand, D. Stellmach, M. M. May, P. Bogdanoff, and S. Fiechter. Evaluation of MnOx , Mn2O3, and Mn3O4 Electrodeposited Films for the Oxygen Evolution Reaction of Water, Journal of Physical Chemistry C 118(26) (2014), pp. 14073–14081. doi:10.1021/jp500939d. Open access.
  19. M. M. May, H.-J. Lewerenz, and T. Hannappel. Optical in situ Study of InP(100) Surface Chemistry: Dissociative Adsorption of Water and Oxygen, Journal of Physical Chemistry C 118(33) (2014), pp. 19032–19041. doi:10.1021/jp502955m. Open access.
  20. M. M. May, O. Supplie, C. Höhn, R. van de Krol, H.-J. Lewerenz, and T. Hannappel. The interface of GaP(100) and H2O studied by photoemission and reflection anisotropy spectroscopy, New Journal of Physics 15(10) (2013), p. 103003. doi:10.1088/1367-2630/15/10/103003. Open access.
  21. T. Hannappel, M. M. May, and H.-J. Lewerenz. Epitaxial III-V Thin Film Absorbers: Preparation, Efficient InP Photocathodes and Routes to High Efficiency Tandem Structures, In: Photoelectrochemical Water Splitting: Materials, Processes and Architectures. Ed. by H.-J. Lewerenz and L. Peter. The Royal Society of Chemistry, 2013. Chap. 9, pp. 223–265. isbn:978-1-84973-647-3. doi:10.1039/9781849737739-00223.
  22. F. F. Abdi, T. J. Savenije, M. M. May, B. Dam, and R. van de Krol. The Origin of Slow Carrier Transport in BiVO4 Thin Film Photoanodes: A Time-Resolved Microwave Conductivity Study, Journal of Physical Chemistry Letters 4(16) (2013), pp. 2752–2757. doi:10.1021/jz4013257.
  23. H. Döscher, O. Supplie, M. M. May, P. Sippel, C. Heine, A. G. Muñoz, R. Eichberger, H.-J. Lewerenz, and T. Hannappel. Epitaxial III-V Films and Surfaces for Photoelectrocatalysis, ChemPhysChem 13(12) (2012), pp. 2899–2909. doi:10.1002/cphc.201200390. Green open access version.
  24. M. M. May, C. Brabetz, C. Janowitz, and R. Manzke. Charge-Density-Wave Phase of 1T-TiSe2 : The Influence of Conduction Band Population, Physical Review Letters 107(17) (2011), p. 176405. doi:10.1103/PhysRevLett.107.176405. Green open access version.
  25. M. M. May, C. Brabetz, C. Janowitz, and R. Manzke. The influence of different growth conditions on the charge density wave transition of 1T-TiSe2, Journal of Electron Spectroscopy and Related Phenomena 184(3–6) (2011), pp. 180–183. doi:10.1016/j.elspec.2011.01.001. Green open access version.

Not peer-reviewed (selection):

  1. M. M. May. "Effiziente Erzeugung regenerativer Brennstoffe über die solare Wasserspaltung". Naturwissenschaftliche Rundschau 72(1) (2019), pp. 10-15.
  2. M. M. May. "YaSoFo - Yet Another SOlar Fuels Optimizer" v1.2.11. Jan. 2021 on Zenodo. doi:10.5281/zenodo.1489157.
  3. M. M. May. "Photoelectron spectroscopy data of InP(100) surfaces in contact with water and oxygen". Oct. 2019 on Zenodo. doi:10.5281/zenodo.3482982.


Patents and patent applications:

  1. M. Kölbach, K. Rehfeld, M. M. May. Submitted 2021.
  2. M. M. May, T. Hannappel, H.-J. Lewerenz. Photoelektrochemische Zelle zur lichtinduzierten Wasserspaltung. DE 10 2016 119 634 A8; EP 3526370B1; WO 2018068953 A1. (2021).
  3. M. M. May, H.-J. Lewerenz, T. Hannappel. Verfahren zum Herstellen einer Photoelektrode zur Wasserstoffentwicklung. DE 10 2014 105 545 B3. (2015).