Explaining the Negative Capacitance by the Chemical Inductor Effect in Halide Perovskite Cell Devices

A negative capacitance effect is observed in perovskite solar cells and other types of hybrid organic-inorganic solar cells. This effect reduces the resistance and affects the performance of the solar cell as well as the degradation characteristics. We apply the concept of the chemical inductor for a better understanding and control of the negative capacitance. The chemical inductor is a combination of a fast and a slow conduction modes that couple to form an inductor arc in the impedance spectrum. We discuss the interpretation of the slow recombination mechanisms in terms of ion-controlled dynamics and we obtain the information for a better characterization of the hybrid photovoltaic devices.