Ultrafast Charge Recombination Mechanism in Single 0D All-inorganic Perovskite Nanocrystals

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August 2023

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Abstract

Nanoscale semiconductors possess many attractive properties as compared to bulk counterparts. Main advantages are tunable energy levels, size-controlled carrier-carrier interactions and, often times, facile synthesis methods offering broad possibilities in optoelectronic applications. A rigorous understanding of the elemental physical properties in these nanos- tructures would provide deep insights for designing and improving the quality of materials. Among many spectroscopic detection methods, single particle spectroscopy is a powerful and sensitive tool for understanding interactions of multiple charge-carrier species in a wide range of materials, from bulk crystals down to individual nanoparticles . In this work, we study various types of so-called “0D” cesium-based perovskite nanocrystals, whose photo and environmental stability has been reported to exceed the conventional 3D perovskites nanocrystals. Due to specific, nearly complete isolation of halide octahedra in 0D structures, their optical properties bear strong resemblance to molecular-type defects, necessitating use of single particle detection methods. The following work concerns with perovskites’ ultrafast charge-carrier dynamics, stability and change of photoluminescence quantum yield (PLQY) inferred from single particle blinking signatures and modified by application of nanoscale alumina layers via the atomic layer deposition (ALD) encapsulation.

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Physics, Optics

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