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.

Center of Materials and Nanotechnologies Faculty of Chemical Technology University of Pardubice Nam Cs Legii 565 53002 Pardubice Czech Republic

Central European Institute of Technology Brno University of Technology Purkyňova 123 612 00 Brno Czech Republic

Centro Universitario de los Lagos Universidad de Guadalajara Lagos de Moreno 47460 Jalisco Mexico

Department of Metallurgical and Materials Engineering Necmettin Erbakan University 42060 Konya Turkey

Department of Physical Chemistry Polish Academy of Sciences Warsaw 01 224 Poland

Institute of Advanced Materials Universitat Jaume 1 Av Vicent Sos Baynat s n 12071 Castellón de la Plana Spain

Instituto de Ciencia de los Materiales Universitat de Valencia 46980 Paterna Spain

Polymat University of the Basque Country UPV EHU 20018 Donostia San Sebastian Spain

Unidad Académica de Ciencia y Tecnología de la Luz y la Materia Universidad Autónoma de Zacatecas Carr Zacatecas Guadalajara km 6 Ejido La Escondida 98160 Zacatecas Mexico

Unidad Académica de Ingeniería Eléctrica Universidad Autónoma de Zacatecas Av Ramón López Velarde 801 Col Centro 98060 Zacatecas Mexico

Citace poskytuje Crossref.org