Publication date: 11th March 2026
Capacitance–frequency measurements on CsFAMA17 perovskite solar cells provide a sensitive probe of mobile ions and their role in electrostatic screening. At low frequencies, ionic redistribution screens the internal electric field, strongly modifying the measured capacitance and complicating its interpretation. In addition, CsFAMA17 exhibits a relatively high dielectric constant, whereas the adjacent transport layers have much lower dielectric constants. As a result, the low-frequency response of the full device is often dominated by the series capacitance of the transport layers rather than by the perovskite bulk itself.
To disentangle ionic, geometric, and interfacial contributions, we explore two complementary strategies. First, insulating interlayers are introduced into the stack to suppress resistive currents in capacitance–frequency measurements, enabling the application of a DC bias to control ion redistribution in a way analogous to low-frequency Mott–Schottky analysis. Second, measurements at reduced temperature are used to slow ionic motion and separate ion-mediated screening from the intrinsic dielectric response. Together, these approaches provide a clearer framework for extracting meaningful information on ion distribution, field screening, and dielectric properties in halide perovskite devices.
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