Betancur Pablo F, Solis Omar E, Abargues Rafael, Ripolles Teresa S, Boix Pablo P
Instituto de Ciencia de los Materiales de la Universidad de Valencia (ICMUV), Paterna, 46980, València, Spain.
Instituto de Tecnología Química, Universitat Politècnica València-Consejo Superior de Investigaciones Científicas, Av. dels Tarongers, 46022, València, Spain.
Phys Chem Chem Phys. 2024 Dec 11;26(48):29904-29912. doi: 10.1039/d4cp04143g.
Perovskite solar cells (PSCs) have demonstrated remarkable advancements in efficiency and stability, yet fully understanding the dynamic processes governing their performance remains a challenge. Impedance spectroscopy (IS) offers a powerful means to characterize PSCs over a wide range of time scales, revealing insights into the internal electronic and ionic processes. However, critical factors like recombination, charge extraction, and transport resistance are often coupled in the same spectra response, affecting their accurate identification. This study explores the use of the - curve reconstruction as a tool to identify when recombination governs the impedance response. Our findings show that recombination resistance can be accurately identified, regardless of the underlying recombination mechanism, in the solar cells with unhindered charge extraction. Conversely, in devices with hindered charge extraction, the IS fitting struggles to decouple the transport, extraction and recombination processes, resulting in inaccurate - reconstructions. These findings emphasize the importance of accurately identifying the physical processes influencing IS spectra to improve diagnostics and device performance in PSC technologies.
钙钛矿太阳能电池（PSCs）在效率和稳定性方面取得了显著进展，但全面了解影响其性能的动态过程仍然是一项挑战。阻抗谱（IS）提供了一种强大的手段，可在广泛的时间尺度上对PSCs进行表征，揭示其内部电子和离子过程的相关见解。然而，诸如复合、电荷提取和传输电阻等关键因素通常在同一光谱响应中相互耦合，影响了它们的准确识别。本研究探索使用 - 曲线重建作为一种工具，以确定何时复合主导阻抗响应。我们的研究结果表明，在电荷提取不受阻碍的太阳能电池中，无论潜在的复合机制如何，都可以准确识别复合电阻。相反，在电荷提取受阻的器件中，阻抗谱拟合难以区分传输、提取和复合过程，导致 - 重建不准确。这些发现强调了准确识别影响阻抗谱的物理过程对于改善PSC技术中的诊断和器件性能的重要性。
