We demonstrated recently a record 19.9%-efficient GaAs solar cell with an absorber thickness of only 200 nm. Our next step is to optimize the device to reach a 25% efficiency. In this contribution we will present our latest simulation and experimental results based on an extensive analysis of the optical and electrical losses. The benefits brought by the contacts optimization and the improvement of the nanostructured design at the rear side of the solar cell will be emphasized.
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