A New Approach to Characterize Charge Transport and Hysteresis in Perovskite Solar Cells
Nogueira, G. L.; Lopez-Richard, V.; Meneghetti Jr., L. A.; Hartmann, F.; Graeff, C. F. O., A New Approach to Characterize Charge Transport and Hysteresis in Perovskite Solar Cells, arXiv 2025, arXiv:2502.10805 [physics.app-ph].
The goal of this study was to develop a new framework for characterizing charge transport and hysteresis in perovskite solar cells (PSCs) by combining experimental data with an analytical transport model focused on ionic and electronic dynamics.
Key findings revealed that hysteresis in PSCs arises from the interplay between mobile ions and trap-assisted recombination near interfaces. The team used impedance spectroscopy (IS) with both small and large voltage excitations and developed a model based purely on charge trapping and generation. This approach successfully reproduced experimental behaviors—such as transitions from capacitive to inductive-like responses—without relying on traditional equivalent circuit models. Transient voltage pulse experiments further validated the existence of distinct transport processes across different timescales.
Fluxim’s Paios system was central to this work. It enabled high-precision J–V measurements, dark injection transients (DIT), sinusoidal IV (Sinus-IV) studies, and frequency-resolved IS. Paios’ ability to capture transient behaviors and subtle hysteresis effects was critical for validating the analytical model and for advancing understanding beyond conventional small-signal analysis.
The findings are important because they offer a deeper and more accurate interpretation of hysteresis phenomena in PSCs, providing a path to improved device design, performance stability, and diagnostic methods for emerging photovoltaic technologies.