Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV24)
DOI: https://doi.org/10.29363/nanoge.hopv.2024.021
Publication date: 6th February 2024
Lead halide perovskite solar cells have shown promising efficiencies; however, their large-scale implementation has been hindered by their instability towards environmental impacts such as moisture or light, next to other challenges such as large-scale fabrication. To further develop lead halide perovskite solar cells, in depth understanding of the intrinsic properties of these absorber materials is necessary. This includes a need to understand the intrinsic electron and ion dynamics under light. So far, most studies on behavior under light exposure focused on perovskite thin films, and largely on the degradation under light. However, slight differences in the preparation of the thin films lead to different grain sizes, which affects the thin film’s properties. Studying single crystals instead of thin films excludes these variations and allows to study the intrinsic properties of different compositions.1 Furthermore, especially the surface and interfaces of the material interact with the environment and possible other device layers. Using photoelectron spectroscopy (PES), the electronic structure and chemical composition of surfaces can be investigated.
Here I will present the laser light-induced electron and ion dynamics of different, clean lead halide perovskite single crystal surfaces, while avoiding X-ray induced changes in the samples. Furthermore, to ensure comparability within the solar cell community, the laser power was set to the equivalent of 1 sun. By using PES for characterizing these crystal surfaces, we were able to follow both compositional and electronic changes and we found distinct behaviors for the different crystal compositions, which give insight into how ion and electron movement are impacted by the perovskite composition.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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