Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.404
Publication date: 16th December 2024
Hybrid-halide perovskites exhibit a unique combination of electronic and ionic characteristics, with the latter posing significant challenges to understanding and controlling the operational mechanisms of perovskite devices. The movement of ions within these materials can lead to issues such as recombination, photovoltage losses, and instability. To address these detrimental effects, various strategies have been employed with notable success. However, the fundamental mechanisms underlying these strategies often remain obscured.
A key distinction between electronic and ionic charges lies in their temporal dynamics: ionic responses are significantly slower, involving processes that occur over extended time frames. Impedance spectroscopy (IS) spans a wide range of time scales, enabling the separation of contributions from different components and processes within the device. In fact, at lower frequencies, IS can yield valuable insights into ion dynamics and their influence on electronic performance by quantifying resistances and capacitances. A notable feature often observed in this frequency range is the "loop" or inductive behaviour. Although the precise origin of this phenomenon is still under debate, its associated time constant can reveal crucial information about the kinetics at the interfaces and their effects on the bulk material.
This contribution will focus on quantifying this time constant and its implications for understanding perovskite device performance. We will explore the relationship between this inductive behaviour, the mechanisms behind a record photovoltage of 1.65 V achieved by a bromine-based perovskite solar cell (PSC), the role of a self-assembled monolayer in enhancing the stability and open circuit potential of a PSC, and insights into the electroformation process of a perovskite-based memristor. These examples illustrate how impedance spectroscopy can offer crucial insights to untangle the complexities of the perovskite puzzle and address its technological challenges.
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