Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
Publication date: 30th March 2023
Stability and reproducibility of perovskite solar cells (PSC) technology is compromised due to their high sensitivity to temperature, moisture and/or oxygen species coming from real application environments.[1] The main degradation mechanism has a chemical nature and consist of the environmental interaction between organic cations present in organometal-halide perovskites and e.g. water molecules by means of hydrogen bonding. ] To solve such an issue, strong efforts are being contemplated to preserve the performance and stability of the PSCs with, for example, different encapsulation strategies, most of them based on polymeric-like coatings.[2][3] Here we present a promising encapsulating alternative by surface functionalization with hydrophobic, water-repellent agents through the employment of vacuum and plasma assisted techniques. Thin fluorinated carbon layers with variable stoichiometry (CFx) deposited by radiofrequency Plasma Enhanced Chemical Vapor Deposition (PECVD) [4]] as well as fluorine molecules grafting the surface of a few oxide monolayers grown by Atomic Layer Deposition have been explored for the development of waterproof and protecting surfaces compatible with the PSCs architecture.[5] A complete physico-chemical characterization of the fluorinated surfaces has been carried out by X-Ray Photoelectron Spectroscopy (XPS) and Scanning Electron Microscopy (SEM) whereas optical properties have been followed by Variable Angle Ellipsometry and UV-Vis Spectrophotometry. Special attention has been paid to the wetting behaviour of the fluorinated surfaces incorporated onto the PSCs. All the fluorinated surfaces are characterized by a compact pinhole-free microstructure characterized by a very high transmittance (above 90%) and high hydrophobicity (Water Contact Angle, WCA>110º). The photovoltaics behaviour is almost completely preserved after the surface functionalization with fluorinated agents, ensuring the compatibility with PSCs and other technologies such as organic solar cells. Finally, a significantly improved stability of the water-repellent PSCs is observed, with a reduced degradation under illumination at environmental conditions even in presence of high relative humidity.
The authors thank projects PID2019-110430GB-C21, PID2019-109603RA-I00, PID2020-112620GB-I00, and TED2021-130916B-I00 funded by MCIN/AEI/10.13039/501100011033 and by “ERDF (FEDER) A way of making Europe” and “NextGenerationEU”/PRTR” by the “European Union”; AEI. We also acknowledge the financial support of the Consejería de Economía, Conocimiento, Empresas y Universidad de la Junta de Andalucía through first the project US-1381045 as well as the EU through cohesion fund and FEDER 2014–2020 programs for financial support. Carmen López-Santos thanks the support of the University of Seville through the VI PPIT-US and the Ramon y Cajal Spanish National programs funded by MCIN/AEI/10.13039/501100011033
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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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