möglich mit Ga und Si bzw. Perovskite mit Ga oder Si.
Interessant zu wissen:
Tandem devices and Perovskite cells
Solar cells based on a single material, such as Silicon, are inherently limited in their efficiency because the single band gap of the material means that the energy of many photons cannot be utilised at all, or is utilised inefficiently. The best silicon cell efficiency is 25%. Further work may increase this to 26-27% which will be close to the theoretical limit. However, the conversion efficiency can be dramatically increased by creating so-called tandem structures, where two or more cells are stacked on top of each other. The top cell has a higher bandgap and efficiently converts high energy photons to electrical energy. Lower energy photons are not absorbed by the top cell but are instead passed to the lower bandgap cell, which can efficiently convert these photons to electrical energy....
...Our work focuses on the implementation of practical tandem devices, as well as the further development of the Perovskite and Silicon cells. Proof-of-concept development work is being carried out with GaAs top cells. This work has already yielded a tandem efficiency of 27.8%. This efficiency is expected to increase further as there is clear scope to exceed 30%....
sun.anu.edu.au/fundamentals/tandemandperovskite