Publication date: 15th December 2025
Wide-bandgap metal-halide perovskites are increasingly recognized as key absorber materials for tandem photovoltaic architectures and indoor energy-harvesting devices. Nevertheless, their performance is still hindered by non-radiative recombination, interfacial defect states, and illumination-induced halide segregation, all of which contribute to voltage losses and reduced operational stability. In this work, we introduce an integrated passivation approach that combines tailored molecular surface modifiers with engineered interlayers, specifically optimized for bromide-rich wide-bandgap perovskite compositions.
We systematically examine the impact of these passivation strategies under both AM1.5 solar irradiation and low-intensity artificial illumination, enabling a direct evaluation of their effectiveness across different lighting conditions. Comprehensive characterization, including trap-density measurements, steady-state and time-resolved photoluminescence, absorption analysis, and continuous-illumination stability testing, reveals that the optimized surface and interfacial passivation significantly reduces trap-assisted recombination, suppresses halide segregation, and enhances the optoelectronic quality of the perovskite films. As a result, the corresponding devices exhibit notable improvements in open-circuit voltage, fill factor, and long-term operational durability relative to untreated controls.
Overall, this study establishes an illumination-robust passivation methodology for wide-bandgap perovskites and provides practical guidelines for the development of high-efficiency, stable devices suitable for both tandem photovoltaic systems and indoor energy-harvesting applications. These insights contribute to the broader understanding of defect mitigation and interface engineering in wide-bandgap perovskite absorbers.
The work is supported by the action: "Promotion of quality, innovation and extroversion in universities (ID 16289)", "SUB1.1 Clusters of Research Excellence - CREs" and funded by the Special Account of the Ministry of Education, Religious Affairs and Sports within the framework of the National Recovery and Resilience Plan “Greece 2.0”, with funding from the European Union – NextGenerationEU and co-financing from national resources (National Public Investments Program – VAT contribution).
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