Stable PeRovskite LEDs via INTerface engineering (SPRINT).

Currently, one-fifth of global power consumption is used for lighting. Therefore, designing energy-efficient lighting devices will significantly contribute to sustainability and the carbon-neutral economy. In recent years, lead-based halide perovskites (APbX3; A = organic/inorganic monovalent cation, X = Cl, Br, I) have emerged as next-generation low-cost semiconductors with excellent light emission properties. The solution-processed perovskite-based LEDs (PeLEDs) have demonstrated efficiencies (EQE) above 20% and are under serious consideration for possible commercialization with a much smaller carbon footprint. Nevertheless, the operational stability of PeLEDs is very poor due to ionic migration induced degradation. With SPRINT, I aim to address this challenge by identifying the interface defect dynamics under operating conditions. This would help to trace the evolution of surface defects and design effective strategy to minimize ionic migration induced degradation. The proposed project will utilize my expertise in the fabrication of highly efficient perovskite-based optoelectronic devices in combination with the world’s leading researcher Prof. Roeffaers’s expertise on in-situ characterizations of semiconducting thin films and the excellent infrastructure facilities at the KU Leuven.

Keywords:Stable perovskite LEDs, Ion migration, degradation mechanisms, site-selective passivation

Disciplines:Surfaces, interfaces, 2D materials, Semiconductor devices, nanoelectronics and technology, Nanoscale characterisation, Nanotechnology not elsewhere classified, Computational materials science