Nouf Alrefae

Energy Transition Specialization · Cohort 2026

Investigation of Passivation at the n-Type Interface in Tin–Lead Perovskite Solar Cells for All-Perovskite Tandem Photovoltaics

Investigation of passivation at the n-type interface in tin-lead perovskite solar cells for all-perovskite tandem photovoltaics. Perovskite solar cells (PSCs) have emerged as a promising renewable energy technology because of the rapidly improving power conversion efficiencies (PCEs). Mixed tin-lead (Sn-Pb) halide perovskites have narrow (1.25 eV) bandgaps, making them singularly suitable as bottom-cell absorbers in all-perovskite tandem solar cells. However, their performance and stability remain limited by the oxidation of Sn²⁺ to Sn⁴⁺ and by non-radiative recombination, which can occur within the perovskite layer and at its interfaces with the charge-transport layers. This research investigates selected passivation treatments at the Sn-Pb perovskite/electron-transport layer interface to reduce surface defects, limit tin oxidation, and suppress non-radiative recombination. Absolute photoluminescence quantum yield (PLQY) measurements are used to determine the quasi-Fermi level splitting (QFLS) and quantify non-radiative voltage losses, while time-resolved photoluminescence (TRPL) spectroscopy will be used to examine charge-carrier lifetimes and extract non-radiative recombination rates. This study aims to clarify the effects of interfacial passivation and identify promising strategies for improving the efficiency of Sn-Pb perovskite solar cells used in all-perovskite tandem photovoltaic devices

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