Light emission from localization in halide perovskites – composition, doping, dimensionality
Sascha Feldmann a
a Laboratory for Energy Materials, EPFL
Materials for Sustainable Development Conference (MATSUS)
Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
Photophysics of metal halide perovskites: from fundamentals to emerging applications - #PeroLight
Sevilla, Spain, 2025 March 3rd - 7th
Organizers: Ivan Scheblykin and Yana Vaynzof
Invited Speaker, Sascha Feldmann, presentation 393
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.393
Publication date: 16th December 2024

Halide perovskites are fascinating semiconductors for light-emitting applications. Compared to conventional inorganic covalent semiconductors like silicon or GaAs, perovskites are structurally soft and often more disordered. Understanding the consequences of this remains a key challenge for commercialization but offers also opportunities for tailoring properties to target applications.

Here I will present our recent mechanistic insights from spectroscopy on the role of composition, doping and dimensionality to control light emission through localization effects in these materials.

I will talk about charge carrier accumulation in mixed-halide 3D systems, compare the photophysics of 2D Pb with that of new 2D germanium perovskites, and, time permitting, will introduce a new synthesis route to ambient doping of 0D nanocrystals giving for the first time access to strongly confined, transition-metal doped perovskite nanocrystals, with profound consequences for the light emitting properties of the resulting materials.

Overall I hope to highlight the promise the vast tunability of this material class holds for next-generation optoelectronic applications, once their working mechanisms are better understood.

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