All-perovskite tandem solar cells with improved grain surface passivation - Nature

All-perovskite tandem solar cells hold the promise of surpassing the efficiency limits of single-junction solar cells; however, until now, the best-performing all-perovskite tandems have exhibited lower certified efficiency than have single-junction perovskite solar cells. A thick mixed Pb-Sn narrow-bandgap subcell is needed to achieve high photocurrent density in tandems; yet this is challenging owing to the short carrier diffusion length within Pb-Sn perovskites.

Molecular dynamics simulations suggest that widely-used phenethylammonium cations are only partially adsorbed on the surface defective sites at perovskite crystallization temperatures. The passivator adsorption is predicted to be enhanced using 4-trifluoromethyl-phenylammonium , which exhibits a stronger perovskite surface-passivator interaction than does PEA.

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