Unveiling the Wavelength-Dependent Performance and Photodegradation Analysis of Perovskite Solar Cells

Recent research has made substantial progress in understanding the wavelength-dependent performance of perovskite solar cells (PSCs) with an N–I–P architecture. In this study, methylammonium lead iodide-based PSCs with a power conversion efficiency of ∼20% were exposed to red, green, and blue light to investigate the complexities of charge transport dynamics within the device. A detailed analysis was carried out to explore the effects of wavelength-specific charge carrier generation on the device performance. Additionally, the processes of charge generation and recombination, contributing to a notable power conversion efficiency, were examined under varying conditions such as temperature, voltage, and illumination. This work provides valuable insights into charge transport dynamics, identifying trap states at around 0.26 eV. Elemental mapping of the cross-section of the degraded devices under different illumination conditions also revealed significant insights into ion migration. The systematic exploration of PSC responses to various wavelengths offers a deeper understanding of the mechanisms influencing efficiency and stability, which are essential for the targeted design and engineering of PSCs for specific applications and operational conditions.