Publication date: 17th February 2025
The development of perovskite solar cells (PSCs) has seen remarkable advancements in recent years, with self-assembled monolayers (SAMs) playing a key role in improving device performance and stability. This work focuses on the use of SAMs, specifically CH₂NH₂-2PACz, to optimize the hole transport layer (HTL) in PSCs. We compare the impact of CH₂NH₂-2PACz with MeO₂PACz, a widely studied SAM, on enhancing the HTL layer of NiO. Initially, CH₂NH₂-2PACz is introduced as a SAM to improve the quality of the NiO layer, enhancing charge transport and reducing recombination losses. In the second part of the study, CH₂NH₂-2PACz is explored as a direct HTL layer, replacing conventional materials to simplify the device structure and reduce fabrication costs. The effects of these SAMs and their modifications on the crystallization and stability of the perovskite layer, particularly under aging conditions, are systematically analyzed using various characterization methods, including XPS, XRD, UV-Vis spectroscopy, I-V analysis..This research highlights the potential of CH₂NH₂-2PACz as a promising SAM and HTL material for improving the efficiency and long-term stability of perovskite-based solar cells.
Keywords: Self-assembled monolayers (SAMs), Hybrid perovskite, Solar cells, NiO, Hole transport layer (HTL), CH₂NH₂-2PACz, MeO₂PACz, Interface engineering, Stability
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