EFFECTS OF ENCAPSULATION ON PEROVSKITE THIN FILMS AND SOLAR CELLS

Date

2023-5-8

Author

Kondakcı, Ece Senem

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Perovskite materials have attracted considerable interest due to their potential as viable options for a range of optoelectronic applications. Among them, their potential as active materials in solar cells has drawn considerable interest. Perovskite materials possess exceptional properties that make them well-suited for the efficient conversion of sunlight into electricity, thereby boosting solar cell performance. However, a significant challenge lies in their susceptibility to degradation when exposed to external environmental conditions, which hampers their ability to perform. This thesis focuses on addressing the issue of perovskite thin film and solar cell degradation by exploring encapsulation techniques. Encapsulation involves the development of protective barriers to shield perovskite materials from harmful environmental factors. By effectively encapsulating solar cells, it is possible to extend their operational lifespan. The process of encapsulation has the utmost importance in perovskite solar cell technology because of the stability and large-area manufacturing problems that are still not solved for large-scale industrial production. Exposure to environmental factors such as oxygen and water vapor leads to irreversible degradation in the performance of perovskite solar cells. A good encapsulation should offer effective environmental insulation, preventing the ingress of harmful substances, while also being transparent and electrically non-interfering with the functioning of the solar cell. In this work, various encapsulation materials such as Surlyn-based Meltonix sheet, EVA, and Enlight were studied. The effect of vi the encapsulation material and production conditions on the electrical and optical properties of the solar cell and perovskite thin film were studied for these three encapsulation materials. The solar cell parameters were found to be less affected by Surlyn-based Meltonix and Enlight encapsulation. In the case of Enlight encapsulation, the efficiency dropped slightly after the lamination and remained stable after a limited time of testing. In the last study, Enlight and Meltonix materials were applied as a double-layer encapsulation format on perovskite solar cells, and they underwent aging tests involving heat and humidity exposure. However, the duration of the aging experiment is not sufficient to draw conclusions about the longterm stability of the investigated perovskite solar cells and films. Additionally, it was observed that the electrical properties of the perovskite solar cells were not affected by the double-layer encapsulation using Enlight and Surlyn-based Meltonix, along with the PIB edge seal. This result indicates that the materials and processes employed in this study did not cause any significant changes in the material properties of the perovskite layer.

Subject Keywords

Photovoltaics, Perovskite Solar Cells, Perovskite Thin Films, Encapsulation

URI

https://hdl.handle.net/11511/104462

Collections

Graduate School of Natural and Applied Sciences, Thesis