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At the HZB Institute for Solar Fuels, several teams are working on a direct approach to solar water splitting: they are developing photoelectrodes that convert sunlight into electrical energy
In photoelectrochemical (PEC) cells, sunlight could be employed to directly produce green hydrogen from water. Until now, systems based on this “direct approach” have not been competitive in terms of energy.
Producing low-cost metal-oxide thin films with high electronic quality for solar water splitting is not an easy task. Especially since quality improvements of the upper metal oxide thin films need .