Publication date: 15th December 2025
Achieving both high efficiency and long-term stability in perovskite solar cells (PSCs) remains a major challenge and an active area of research. At LPEM-CNRS, our team focuses on uncovering the fundamental degradation mechanisms in PSCs and developing engineering strategies to mitigate them. In this presentation, I will highlight recent work from our group1 that leverages nanoscale structural-property investigations to elucidate the physical and chemical processes governing the degradation and passivation of functional PSCs.
While extensive efforts have been made to understand degradation mechanisms, direct probing of the buried interfaces, where critical degradation often initiates, has remained elusive. In this work, we introduce a new in situ methodology that harnesses the nanothermometric properties of embedded upconversion fluoresent nanoparticles (UCNPs) placed at the buried perovskite/hole transport layer (HTL) interface. This approach allows, for the first time, real-time tracking of local interfacial temperature evolution during light-induced accelerated degradation, while simultaneously monitoring the device's optical and photovoltaic performance. Applied to PSCs with different perovskite compositions, this technique reveals non-trivial thermal signatures and distinct degradation regimes correlated with structural and optical changes observed via ex situ characterizations. The results uncover a dynamic interplay between heat accumulation, phase transformation, and material decomposition, offering insights into the spatiotemporal evolution of PSC degradation.
In parallel, we investigate passivation strategies aimed at improving PSC stability against humidity. Fluorinated molecules have shown promise in the literature as partial moisture barriers; however, previously reported short-chain variants offer only limited enhancement of the perovskite surface’s water-contact angle. Here, we explore a family of fluorosilane molecules capable of rendering perovskite surfaces superhydrophobic. Using a combination of spectroscopic techniques, I will discuss the interaction mechanisms between these fluorosilanes and the perovskite absorber, and their implications for device stability.
We acknowledge the support from the PEPR TASE "MINOTAURE" project (ANR-22-PETA-0015) and the "NBG_SolarCells" (ANR-24-CE05-7657) project.
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