Electrochemical Impedance Spectroscopy of All-Perovskite Tandem Solar Cells.

ABSTRACT: This work explores electrochemical impedance spectroscopy to study recombination and ionic processes in all-perovskite tandem solar cells. We exploit selective excitation of each subcell to enhance or suppress the impedance signal from each subcell, allowing study of individual tandem subcells. We use this selective excitation methodology to show that the recombination resistance and ionic time constants of the wide gap subcell are increased with passivation. Furthermore, we investigate subcell-dependent degradation during maximum power point tracking and find an increase in recombination resistance and a decrease in capacitance for both subcells. Complementary optical and external quantum efficiency measurements indicate that the main driver for performance loss is the reduced capacity of

SUBMITTER: Roose B 

PROVIDER: S-EPMC10863385 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature