Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 1: Tutorial: Energy materials

HL 1.4: Hauptvortrag

Sonntag, 30. März 2014, 17:55–18:30, HSZ 403

Perspectives of an artificial leaf based on inorganic semiconductors for water splitting: Device structure, interface engineering, catalytic demands — •Wolfram Jaegermann — TU Darmstadt, Instiute of Materials Science, Jovanka-Bontschits-Str. 2, D-64287 Darmstadt

For an effective conversion of solar energy to a chemical fuel a number of elementary processes as well as their coupling to each other must be optimized without severe losses in the number and the chemical potential of the originally generated electron-hole pairs. Light absorption coupled to efficient charge carrier generation and separation may be realized by thin film semiconductor devices - preferentially tandem cells - which may provide broad band quantum efficiencies close to 1. Alternatively, Janus type photocatalysts may be chosen which favour vectorial electron-hole pair transport into opposite directions. Subsequently, H2 (or HC-fuels) and O2 from H2O (and CO2) must be formed by electron and hole transfer reactions with minimized loss of chemical potential. This will only be possible if the involved charge transfer steps are coupled to selective multi electron transfer catalysts. Technologically feasible solutions seem to be possible for water splitting and H2-generation, as we will show with a number of investigations performed recently combining electrochemical investigations with surface science approaches.

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