Publication date: 11th March 2026
Halide perovskite (HaP) materials have been of great interest within photovoltaic research in the recent years mainly due to their rapidly increasing power conversion efficiency (PCEs), reaching 26.9% in single junction devices and 35% in perovskite/silicon tandem solar cells. In addition to their high performances, Halide perovskite solar cells (PSCs) offer advantages such as their great band gap tunability, low carbon footprint and fast energy payback. One of the most interesting properties is their ability to self-heal from photo-induced damage. This property gives HaPs a unique advantage compared with conventional semiconductors that tend to suffer from loss due to the presence of defects. However, despite this potential, PSCs still face significant challenges realated to to long-term stability since they still suffer from fast degradation under exposed to light and ambient air. In our project we aim to develop a deeper understanding of both the degradation mechanisms, and the mechanisms that drive the HaPs self-healing properties. To achieve this, the films are studied using mainly Fourier-transform infrared spectroscopy (FT-IR) and atomic force microscopy–infrared spectroscopy (AFM-IR). AFM-IR combines atomic force microscopy with infrared spectroscopy to enable identify chemical changes on the surface composition of the halide perovskite films after they have undergone degradation. The effect of different environments, for instance in ambient air compared to nitrogen environment, on the degradation of HaPs is studied. Complementary techniques such as UV-vis spectroscopy, photoluminescence spectroscopy and Kelvin probe measurements are implemented to study the degradation mechanisms as well. This study provides insight into the interplay between degradation and recovery processes in halide perovskites, contributing to the development of more stable and durable perovskite solar cells.
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