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Turren Cruz, Silver Hamill, 2025, "Dual Interface Modification for Reduced Nonradiative Recombination in n–i–p Methylammonium-Free Perovskite Solar Cells", https://doi.org/10.18150/FA3M36, RepOD, V1
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High defect concentrations at the interfaces are the basis of charge extraction losses and instability in perovskite solar cells. Surface engineering with organic cations is a common practice to solve this issue. However, the full implications of the counteranions of these cations for device functioning are often neglected. In this work, we used 4-fluorophenethylammonium cation with varying halide counteranions for the modification of both interfaces in methylammonium-free Pb-based n–i–p devices, observing significant differences among iodide, bromide, and chloride. The cation treatment of the buried and top interfaces resulted in improved surface quality of the perovskite films and largely improved carrier dynamics with reduced nonradiative recombination. Consequently, the optimal interface-modified methylammonium-free perovskite solar cells surpassed 20% efficiency and demonstrated remarkable operational stability. Our findings underscore the potential of comprehensive surface engineering strategies in advancing the perovskite film and device quality, thereby facilitating their broader and more successful applications.
interface modification, 2D/3D perovskite, perovskite solar cells, perovskite stability, halide segregation
Juan José Rodriguez-Perez, Diego Esparza, Muhammad Ans, David Armando Contreras-Solorio, Teresa Diaz Perez, Jhonatan Rodriguez-Pereira, Eva M. Barea, Isaac Zarazua, Daniel Prochowicz, Seckin Akin, Juan P Martinez-Pastor, Jorge Pascual, Iván Mora-Seró, and Silver-Hamill Turren-Cruz ACS Applied Materials & Interfaces 2025 17 (5), 8610-8618 DOI: 10.1021/acsami.4c20462 https://pubs.acs.org/doi/full/10.1021/acsami.4c20462 doi: 10.1021/acsami.4c20462
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