Study of light induced ion migration in perovskite solar cells using non-linear impedance spectroscopy
Paramadam, Sanish
Paramadam, Sanish
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Abstract
Perovskite solar cells (PSCs) exhibit nonlinear behavior, such as hysteresis, due to interactions between mobile ions and charge carriers, impacting stability. Light exposure further influences these effects.This study employs nonlinear impedance spectroscopy (NLIS) to analyze higher harmonic responses using Fourier analysis, distinguishing nonlinear from linear processes. Under open-circuit light exposure, the low-frequency peak shifts, indicating ionic redistribution, while closed-circuit conditions suppress this effect.Temperature-dependent analysis helps characterize the activation energy of migrating species. As the first NLIS application to PSCs, this work provides insights into nonlinear mechanisms, advancing the understanding of device physics.
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Graduate
Date
2025-05-29