Latest AM from Mei Anyi at Huazhong University of Science and Technology: Interface Field-Effect Passivation via Selective Cation Extrusion Enhances the Performance of Printable Mesoscopic Perovskite Solar Cells

The mesoporous electron transport layer (ETL) in printable mesoporous perovskite solar cells (p-MPSCs) can rapidly and selectively extract photogenerated electrons, facilitating device fabrication without the need for a hole transport layer (HTL). However, the inherent mesoporous structure introduces numerous interfacial defects, which promote non-radiative recombination and thereby limit power conversion efficiency. In light of this, on May 23, 2025, Mei Anyi, Huazhong University of Science and Technology This paper reports the publication in AM of research demonstrating that selective cation extrusion can achieve interface field-effect passivation, thereby enhancing the performance of printable mesoscopic perovskite solar cells. The study implements an interface field-effect passivation strategy based on spatially selective cation extrusion. By introducing tetraphenylphosphonium cations—large organic ions that migrate to the perovskite/ETL interface during crystallization—a strong interfacial electrostatic field is established. This field simultaneously suppresses non-radiative recombination through an induced field-effect passivation and enhances charge extraction by optimizing the energy alignment. The synergistic effect boosts the power conversion efficiency from 19.4% to 21.0%. This work underscores the potential of cation-engineered interfacial fields in improving the performance of HTL-free carbon-electrode perovskite photovoltaics.