Publication date: 5th November 2025
The efficiency of perovskite-based tandem solar cells has rapidly increased, primarily driven by those with Si bottom cells, which have reached a highest certified efficiency of 34.9%. In addition to Si, thin-film bottom cells made from low-bandgap materials such as chalcogenides, perovskites, and organics, also show promise for applications where Si-tandems are not suitable, such as lightweight, flexible or space-based solar cells. Regardless of the bottom cell material, the interface between the subcells is a critical component in determining the performances of tandem solar cells. This interface must transmit both electrons and photons simultaneously, but in opposite directions (in the case of p-i-n devices). In this presentation, our recent research progress on optimizing the interface between subcells in highly-efficient perovskite-based tandem solar cells with various bottom cells such as Si, CZTSSe, and CIGS will be introduced.[1-5]
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