Beyond Lead Halide Perovskite Nanocrystals

Liberato Manna^a

^aDepartment of Nanochemistry, Istituto Italiano di Tecnologia, Italy, Via Morego, 30, Genova, Italy

Online Meetups
Proceedings of Online Meetup - Beyond Lead Halide Perovskites: Syntheses and Applications of Metal Halide Semiconductors (MABP)

Online, Spain, 2020 April 23rd - 23rd

Organizer: Quinten Akkerman

Invited Speaker Session, Liberato Manna, presentation 002
Publication date: 23rd April 2020

Halide perovskite semiconductors can merge the highly efficient operational principles of conventional inorganic semiconductors with the low‑temperature solution processability of emerging organic and hybrid materials, offering a promising route towards cheaply generating electricity as well as light. Following a surge of interest in this class of materials, research on halide perovskite nanocrystals as well has gathered momentum in the last years. In such a narrow time span, several properties/features of halide perovskite nanocrystals were investigated, among them electroluminescence, lasing, anion-exchange, as well as control of size and shape. While most of the emphasis has been put on CsPbX₃ perovskites, the toxicity of lead has driven the search for non-toxic alternative perovskite (or perovskite-related) NC materials featuring a bright PL emission and, at the same time, a high stability. In this regard, the so-called double perovskite NCs, having chemical formula A⁺₂B⁺B³⁺X₆, have been identified as possible alternative materials, together with various other metal halides, possibly doped with various elements. This brief talk will therefore highlight the research efforts of our group on these materials. Finally, we will introduce a new class of colloidal nanocrystals, made of lead chalcohalides. These are kinetically trapped metastable nanostructures, which in the bulk were only obtained under high-pressure conditions (Pb₄S₃I₂), in traces (Pb₃S₂Cl₂), or that were never obtained at all to date (Pb₄S₃Br₂). Albeit not emissive, they might find applications in photodetectors and solar cells, as shown by preliminary tests in our labs.

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