Fig.1: (left): scheme for tomographic peak sampling; (right): influence of electrostaic potential on peak width
Implications regarding charge transfer and the development of efficient devices for light - induced fuel generation are outlined and optimized structures which show unassisted water splitting are presented, obtained upon modifying the surfaces of III-V tandem absorbers. Application of (photo)electrochemically induced surface transformations 4,5 and of re-directed (photo)corrosion reactions allows passivation of surface and interface states and increased robustness. Details of these procedures will be given. The achieved efficiencies are compared to theoretically achievable limits of solar hydrogen evolution for the respective material combinations6. The influence of the optical properties of the combined catalyst - electrode - solution composite structures is described and routes to more advanced multi-electron and proton transfer reactions are outlined.
1. D.C. Grahame, Chem. Rev. 41 (1947) 441-501
2. M.F. Lichtermann, M.H. Richter et al., Energy Environm. Sci. 8 (2015) 2409-2416
3. M.F. Lichtermann, M.H. Richter et al., J. Electrochem. Soc. 163 (2016) H 139-146
4. H.J. Lewerenz, C. Heine et al., Energy Environm. Sci. 3 (2010) 748-760
5. M.M. May, H.J. Lewerenz et al., Nature Comm. 6 (2015) 8286