Proceedings of MATSUS Fall 2024 Conference (MATSUSFall24)
Publication date: 28th August 2024
Nonradiative recombination at the interfaces of devices and in perovskite solar cells (PSCs) remains a barrier to achieving effective performance and stability [1]. To address this, functionalized organic molecules are being employed to not only passivate the surface defects but also to optimize the surface structure, and to push the overall device performance [2-3]. In this study, we introduce cyanoguanidine diiodide as a molecular surface passivator, which significantly improves the fabricated PSCs efficiency from 20.44% to 23.04% [4]. This advancement is primarily driven by an increased fill factor (FF) of 80.64% and an open-circuit voltage (Voc) of 1119 mV. Detailed analysis, including steady-state photoluminescence and microstructural characterization, reveals favorable surface modification of the perovskite layer, facilitating improved charge transfer between the perovskite and Spiro-OMeTAD interface. Our results suggest that the synergistic interaction between amino and cyano functional groups, coupled with the iodide reservoir, is key to enhancing solar cell performance.
Keywords: Perovskite, Passivation, Surface modification, defect density.
This work received funding from the European Union H2020 programunder a European Research Council Consolidator grant (MOLEMAT,726360). Support from the Spanish Ministry of Science and Innovation(PID2019-111774RB-100/AEI/10.13039/501100011033 and INTERACTION(PID2021-129085OB-I00)) is acknowledged
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