Preparation method of inorganic perovskite nanocrystal based on thiocyanate doping
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A nanocrystal and inorganic calcium technology is applied in the field of preparation of inorganic perovskite nanocrystals to achieve the effects of uniform morphology, simple method and simple operation.
Inactive Publication Date: 2017-07-07
SOUTHEAST UNIV
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However, this control method is to choose between halogen elements, and the study of replacing halogens with anions other than halogen elements to control optical properties has not yet appeared.
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Embodiment 1
[0026] Step 1, 2.5mmol Cs 2 CO 3 Dissolve in 40ml of octadecene and 2.5ml of oleic acid, dry in vacuum at 120°C for 1 hour, pass nitrogen gas, raise the temperature to 150°C to dissolve completely, and form a cesium oleate precursor solution, which is used as a stock solution;
[0027] Step 2, 0.0690g PbBr 2 , 0g Pb(SCN) 2 Mixed with octadecene, first vacuumize the mixed solution, then pass in an inert gas, and then vacuumize again, and cycle for 3 times; finally, heat-preserve and dry at 120°C for 1 hour under vacuum conditions;
[0028] Step 3, feed inert gas nitrogen, add surfactants 0.5ml oleic acid and 0.5ml oleylamine to the mixed solution in step 2 respectively, continue to keep warm to completely dissolve the reactants, and obtain a lead precursor solution;
[0029] Step 4: After heating up to 150°C, take 0.4ml of the cesium oleate precursor solution in step 1 and quickly inject it into the lead precursor solution in step 3 to generate CsPbBr 3 ; Insulate at 150°C ...
example 2
[0032] Adopt the same process of embodiment 1, the difference is that PbBr in step 2) of embodiment 1 2 , Pb(SCN) 2 The quality of the mass was changed to 0.0676g and 0.0012g respectively, and the other conditions were kept the same, and the obtained product was CsPbBr 2.94 (SCN) 0.06 .
example 3
[0034] Adopt the same process of embodiment 1, the difference is that PbBr in step 2) of embodiment 1 2 , Pb(SCN) 2 The quality of the mass was changed to 0.0662g and 0.0024g respectively, and the other conditions were kept the same, and the obtained product was CsPbBr 2.88 (SCN) 0.12 .
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Abstract
The invention provides a preparation method of a CsPbBr3-x(SCN)x (x is equal to 0, 0.06, 0.12 and 0.18) inorganic perovskite nanocrystal based on thiocyanate doping.The method comprises the steps of mixing PbBr2 and Pb(SCN)2 with a reaction solvent octadecene, a surfactant oleic acid and oleylamine till complete dissolution under an inert gas shielding condition, heating a mixed solution to a reaction temperature, quickly injecting a cesium precursor, allowing a system to start reaction to generate a perovskite structure, gradually forming a CsPbBr3-x(SCN)x nanocrystal with the proceeding of the reaction, quickly cooling a product in an ice water bath after the reaction is finished, and obtaining the final CsPbBr3-x(SCN)x inorganic perovskite nanocrystal.According to the method, a hot injection synthesis method is adopted; a thiocyanate ion is doped to different extents; and micro regulation of an optical property of inorganic perovskite is achieved on the premise of not changing morphology and a crystal structure of the perovskite.The synthesized perovskite nanocrystal is better in monodispersity and stability and uniform in morphology and has profound significance for constructing a high-performance full-solution photoelectric device.
Description
technical field [0001] The invention relates to a preparation method based on thiocyanate-doped inorganic perovskite nanocrystals, belonging to the technical field of new material preparation. Background technique [0002] With the advent of new perovskite solar cells, perovskite materials have attracted more and more attention. In recent years, pure inorganic perovskite nanomaterials have emerged in the field of optoelectronics due to their better stability. Inorganic perovskite nanomaterials have more excellent photoelectric performance, wider luminescence spectrum, higher photoelectric conversion efficiency and carrier mobility, and fast response speed, making them widely used in solar cells, photodetectors, and optical sensors. , Light-emitting diodes and other fields have quite broad application prospects, and the development value is very high. [0003] Via ion exchange, inorganic perovskite ABX 3 The luminescence spectrum can be tuned over the entire visible range (...
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