Grafting and Orientation of Carbazole-based Phosphonic acid Monolayers on conductive metallic oxides ; Template for the Growth of Hybrid Perovskite used in solar cells.
Philippe Lang a, Yahya Yahya Hami a, Balkis Nasraoui a, Faiza Mameche a, Philippe Decorse a, Sarra Sarra Gam Derouich a, Mahamadou Seydou a
a ITODYS University of Paris Cité
Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO24)
Sardinia, Italy, 2024 June 17th - 18th
Organizers: Giulia Grancini, Francesca Brunetti and Maria Antonietta Loi
Oral, Philippe Lang, presentation 033
Publication date: 25th April 2024

Carbazole-based grafted monolayers have recently been employed as an intermediate layer (IL) between the conducting electrodes (ITO) and the active layer in perovskite solar cells (PSCs). The primary objective was to enhance device performance by meticulously adjusting the electronic energy levels of the ITO to align with those of the halogenated perovskite (HP) film. This approach aims to optimize charge transfer and energy recovery, thereby optimizing the overall characteristics of the PSC. In this study, organic molecules were designed and synthesized: H2PO3-(CH2)2-Cz-R2, where Cz represents carbazole, and R in position 3, 6 varies as CH3O, NH2/NH3+, or -CH2NH2 /NH3+. The grafting process onto ITO and NiO, as well as the thickness and orientation of the grafted materials, have been meticulously determined in order to understand both their electronic effects and their impact on the growth and structure of HP CH3NH3PbI3 (MAPI). Finally, an in-depth analysis of the structure of the carbazole layer and the relationship between photovoltaic performance is being carried out.

research has been conducted into the grafting, orientation and structure of the monolayers utilizing advanced techniques, including IR spectroscopy (PM-IRRAS), XPS and UPS. The impact of the monolayer on the structure of the perovskite MAPbI3 film has been studied using UV-Vis spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM). This comprehensive analysis examines the influence of monolayers on the structure of hybrid perovskite films, photovoltaic performance and the stability of perovskite solar cells. In particular, the study investigates the impact of the nature of the terminal poles (NH2, CH2NH2 vs. MeO) and the potential formation of a shared plane with the perovskite layer. The discussions encompass their electronic impact on the interface, the growth of the HP layer and the orientation of the crystallization planes in MAPbI3 perovskite on ITO and NiO modified by the monolayers.

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