High-quality amidino perovskite FAPbI3 colloidal quantum dot and preparation method thereof

Abstract

The invention discloses a high-quality amidino perovskite FAPbI3 colloidal quantum dot and a preparation method thereof. The preparation method comprises the following steps: by taking formamidine acetate, lead acetylacetonate and 9-octadecenyl amine iodide (oleylamine iodine) as three precursors and taking classic oleylamine and oleic acid as surface ligands, firstly, mixing a solution of formamidine acetate, lead acetylacetonate and 1-octadecene and oleic acid, and carrying out heating and stirring under the protection of inert gas to obtain a clear and transparent solution, taking a properamount of oleylamine iodine dissolved in anhydrous toluene, injecting the oleylamine iodine into the clarified solution, rapidly cooling the reaction solution by using an ice-water bath, and finally carrying out centrifugal purification to obtain the high-quality FAPbI3 colloidal quantum dot. The method is simple and easy to implement, short in process, easy to control in operation and suitable for application and popularization, and the obtained nano material is uniform in morphology and has excellent optical characteristics and thermal stability.

Description

technical field [0001] The present invention relates to perovskite solar cell collar, in particular to a high-quality FAPbI 3 Colloidal quantum dots and preparation methods thereof. Background technique [0002] In recent years, for the sustainable development of human society, finding an efficient and alternative new energy source has become an important research direction in the field of international energy research. Perovskite solar cells have high photoelectric conversion efficiency and low cost, so they have received extensive attention and research. Solar cells based on perovskite materials have developed rapidly in the past ten years, and their highest photoelectric conversion efficiency has reached 25.2%. , surpassing the efficiency of polycrystalline silicon solar cells widely used in the market, perovskite materials have become a new star in the field of solar cell research today. [0003] Perovskite solar cells include electrode materials, electron transport la...

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Problems solved by technology

[0004] FAP 3 Quantum dots (FA to NH 2 CH=NH 2 + ) is one of the most promising perovskite materials at present, and its main preparation method is the hot injection method. The hot injection method is generally divided into two precursor methods and three precursor methods. The two precursor methods use formamidine acetate and lead iodide Two kinds of precursors are synthesized, since the raw material used is lead iodide (PbI 2 ), so it is impossible to accurately adjust the stoichiometric ratio of Pb and I elements; the existing three-precursor method uses formamidine acetate, lead acetate, and oleylamine-iodine as three precursors, and the nanoparticles synthesized by this method have poor morphology and are not Stable crystal structure is not conducive to the formation of tightly ordered superlattice films, which is not conducive to the further improvement of device efficiency

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