Study of light induced ion migration in perovskite solar cells using non-linear impedance spectroscopy
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.
Primary Faculty Mentor Name
Matthew S. White
Status
Graduate
Student College
College of Engineering and Mathematical Sciences
Program/Major
Materials Science
Primary Research Category
Physical Science
Study of light induced ion migration in perovskite solar cells using non-linear impedance spectroscopy
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.
