Combining market-proven silicon solar cell technology with an efficient
wide band gap top cell into a tandem device is an attractive approach to
reduce the cost of photovoltaic systems. For this, perovskite solar
cells are promising high-efficiency top cell candidates, but their
typical device size (<0.2 cm2), is still far from standard industrial sizes. We present a 1 cm2 near-infrared transparent perovskite solar cell with 14.5% steady-state efficiency, as compared to 16.4% on 0.25 cm2.
By mechanically stacking these cells with silicon heterojunction cells,
we experimentally demonstrate a 4-terminal tandem measurement with a
steady-state efficiency of 25.2%, with a 0.25 cm2 top cell. The developed top cell processing methods enable the fabrication of a 20.5% efficient and 1.43 cm2
large monolithic perovskite/silicon heterojunction tandem solar cell,
featuring a rear-side textured bottom cell to increase its near-infrared
spectral response. Finally, we compare both tandem configurations to
identify efficiency-limiting factors and discuss the potential for
further performance improvement.
- HALIDE PEROVSKITES