As the pursuit for highest efficiency and cost reduction goes on, silicon-based technologies are about to reach the technological limit. Therefore, the interest in tandem application is strongly increasing. Especially perovskite-silicon tandem solar cells are currently being investigated as candidate for next generation PV devices combining low costs [1] and high efficiency [2]. Different designs of the perovskite top cell as well as candidates for interlayers and tunneling junctions are currently trailed. Even the race for the best suited silicon bottom cell is not yet decided since the requirements of a silicon bottom cell with respect to performance, costs and compatibility with the subsequent industrial processing steps of the tandem cells are somewhat different compared to that of the single junction solar cells. Therefore, a systematic evaluation of tandem bottom cells from cost and efficiency perspective is needed.
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