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Optimization and characterization of tunnel junctions for interconnection of Perovskite-Si tandem solar cells
Michaela Penn
11:15 - 12:15 Wednesday 27 May 2020 PH 01 150

Monolithic perovskite-silicon tandem solar cells can potentially overcome the intrinsic power conversion efficiency limit for silicon single junction cells at reasonable costs. However, the device architecture requires a low-loss interconnection where the respective majority charge carriers of the two sub cells can recombine. One way to achieve this is a tunnel junctions made out of highly doped polycrystalline silicon.
This work deals with the development of such tunnel junctions in combination with a passivating selective contact for future integration into a highly efficient silicon bottom cell. The process flow is optimized on test structures and characterized regarding active doping profiles, current-voltage characteristics and optical properties. To tackle the diffusion of dopant atoms caused by high temperature treatments in the processing sequence, the inclusion of impurity atoms as well as diffusion blocking interlayers are discussed and their impact on the performance of the tunnel junction is evaluated.