Method for synthesizing CsSnX3 perovskite quantum dots by microwave-assisted heating

Abstract

The invention discloses a method for synthesizing CsSnX3 perovskite quantum dots by microwave-assisted heating, and belongs to the field of semiconductor and nanotechnology. The method comprises the steps: adding cesium carbonate (Cs2CO3), oleic acid (OA) and oleylamine (OAm) according to the molar ratio of 1 to 0.375 to 0.375 to a mixed solvent mixed by octadecene (ODE) and a polar solvent with a volume ratio of (1:3) to (1:5), then placing into a microwave heating apparatus, stirring and vacuumizing, raising the temperature to be 60 to 100 DEG C, preserving heat to be dissolved, obtaining a cesium precursor solution with a molar concentration of 0.5 to 1.5M; introducing inert gas, raising the temperature to be 150 to 190 DEG C, injecting quickly a halide tin (SnX2) trioctylphosphine (TOP) solution, reacting for 1 to 5min, adding methyl acetate or tert-butanol after cooling, centrifuging, washing with n-hexane for 3 to 5 times, and obtaining CsSnX3 quantum dot powder after drying. According to the method for synthesizing the CsSnX3 perovskite quantum dots by microwave-assisted heating, the temperature distribution of the reaction temperature field is uniform and precisely controllable, the heating and cooling speed is fast, the preparation period is short and the yield is high; the quantum point has high crystallinity, less surface defects, uniform size distribution, high fluorescence quantum yield and high safety.

Description

Technical field [0001] The invention belongs to the field of semiconductor and nanotechnology, and specifically relates to the synthesis of CsSnX by microwave assisted heating 3 The method of perovskite quantum dots. Background technique [0002] Quantum dots (QD), also known as colloidal semiconductor nanocrystals (NCs, usually 2-20nm large), because of their unique properties such as quantum confinement effect and quantum size effect, they exhibit excellent optoelectronic properties and have a wide range of Application potential and prospects. Compared with traditional nanocrystals and organic dyes, quantum dot materials have a wide excitation region and a narrower emission spectrum. The fluorescence spectrum can be distributed in the entire visible light range, so it has stronger light absorption and stable light emission performance. The stability of the fluorescence intensity of quantum dots is also better than that of traditional organic fluorescent dyes, the fluorescence...

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Problems solved by technology

However, the CsSnX prepared by this method 3 Low fluorescence yield of quantum dots (<1%)

This is because the traditional heating method of the heat injection method uses a heating mantle to heat, and uses heat conduction, heat convection, and heat radiation to transfer heat from the outside to the reaction solution. Due to the uneven heat transmission speed and distribution, the reaction solution inevitably exists Due to the temperature gradient, the heating is uneven, and the temperature display accuracy of different heating devices has errors, and local overheating occurs, resulting in a wide distribution of quantum dot size and uneven crystallinity

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