Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.357
Publication date: 16th December 2024
Halide perovskites show excellent optoelectronic properties including bandgap tunability, high radiative recombination rates and narrow emission lines that make them promising candidates for the next generation solar cells, LEDs and detectors.[1],[2],[3] Their optical properties and ease of processing make them very interesting to control light matter interactions to deliver devices with unique properties and enhanced performance. However, their thin film character is yet to be exploited to enable full control over the emission properties, something that would open avenues to surpass the luminous efficacies of conventional LEDs and facilitate their widespread adoption.
In this talk, we present a novel green perovskite LED architecture where enhanced emission and directionality on demand are achieved by means of a hybrid photonic-plasmonic structure.[4] We show how a code based on the transfer matrix model boosted by a genetic algorithm identifies the best combination of materials and thin film thicknesses to maximise outcoupled light with very narrow and controllable angular dispersion; all in a realistic fashion compatible with the fabrication of efficient LEDs. The experimental realization of the optimum designs allows us to demonstrate devices with amplified green emission selectively enhanced at different angles. Our low temperature process can tune the perovskite thickness on a nanometric scale to enhanced electroluminescence on demand from forward direction (0°) to up to 40°. This approach expands the role of the perovskite film from a mere emitter to an active photonic layer participating in the strong interference phenomena arising from the designed photonic-plasmonic nanostructures. Our methodology is versatile and easily integrable into cost-effective perovskite LEDs with emission lines covering the entire visible spectrum. Finally, we adapt this resonant cavity concept to demonstrate a highly spectral selective and robust perovskite photodetector, showing 2.4-fold EQE enhancement at the narrowband peak with respect to a broadband photodetector counterpart of the same perovskite thickness.[5]
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