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Nano Research

Article Title

Non-injection gram-scale synthesis of cesium lead halide perovskite quantum dots with controllable size and composition

Keywords

metal-halide perovskites, gram-scale synthesis, controllable size andcomposition, optoelectronic materials

Abstract

Metal-halide perovskites are novel optoelectronic materials that are consideredgood candidates for solar harvesting and light emitting applications. In thisstudy, we develop a reproducible and low-cost approach for synthesizing highqualitycesium lead halide perovskite (CsPbX3, X = Cl, Br, and I or Cl/Br andI/Br) nanocrystals (NCs) by direct heating of precursors in octadecene in air.Experimental results show that the particle size and composition of as-preparedCsPbX3 nanocrystals can be successfully tuned by a simple variation of reactiontemperature. The emission peak positions of the as-prepared nanocrystals canbe conveniently tuned from the UV to the NIR (360–700 nm) region, and thequantum yield of the as-obtained samples (green and red emissions) can reachup to 87%. The structures and chemical compositions of the as-obtained NCswere characterized by transmission electron microscopy, X-ray diffraction, andelemental analysis. This proposed synthetic route can yield large amounts ofhigh-quality NCs with a one-batch reaction, usually on the gram scale, andcould pave the way for further applications of perovskite-based light-emittingand photovoltaic solar cells.

Graphical Abstract

Publisher

Tsinghua University Press

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