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The economic value of a photovoltaic installation depends upon both itslifetime and power conversion efficiency. Progress towards the latter includesmechanisms to circumvent the Shockley- Queisser limit, such as tandem designsand multiple exciton generation (MEG). Here we explain how both silicon tandemand MEG enhanced silicon cell architectures result in lower cell operatingtemperatures, increasing the device lifetime compared to standard c-Si cells.Also demonstrated are further advantages from MEG enhanced silicon cells: (i)the device architecture can completely circumvent the need forcurrent-matching; and (ii) upon degradation, tetracene, a candidate singletfission (a form of MEG) material, is transparent to the solar spectrum. Thecombination of (i) and (ii) mean that the primary silicon device will continueto operate with reasonable efficiency even if the singlet fission layerdegrades. The lifespan advantages of singlet fission enhanced silicon cells,from a module perspective, are compared favorably alongside the highly regardedperovskite/silicon tandem and conventional c-Si modules.

Singlet fission and tandem solar cells reduce thermal degradation and enhance lifespan