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Method for synthetizing high-stability metal halide perovskite/lead sulfide heterostructure nanocrystals

A metal halide, perovskite technology, applied in chemical instruments and methods, nanotechnology, luminescent materials, etc., can solve problems such as poor stability, achieve good film formation, high luminous efficiency, and improve the effect of photocurrent

Active Publication Date: 2016-05-25
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the defects of poor stability of perovskite materials in the prior art, the present invention provides a method for synthesizing highly stable metal halide perovskite / lead sulfide heterojunction nanocrystals, which improves the stability of perovskite and its Luminous efficiency, while using the flexible and adjustable photoelectric characteristics of lead sulfide to form a synergistic effect with metal halide perovskites, increasing the photocurrent while reducing the dark current

Method used

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  • Method for synthetizing high-stability metal halide perovskite/lead sulfide heterostructure nanocrystals
  • Method for synthetizing high-stability metal halide perovskite/lead sulfide heterostructure nanocrystals

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Step 1, dissolving 6mmol of Cs(st) in 40mL of octadecene, and heating and stirring to completely dissolve it to form a cesium precursor;

[0024] Step 2, dissolve 0.5mL of DDAB-S in 2mL of toluene, stir evenly, and make sulfur precursor;

[0025] Step 3, dissolving 0.15 mmol of lead acetate in 2 mL of toluene and 1 mL of oleylamine mixture (the volume ratio of toluene and oleylamine is 2:1), stirring evenly to form a lead precursor;

[0026] Step 4, weigh 0.198g of PbBr 2 , dissolved in a mixed solution of 1.5mL oleic acid, 1mL oleylamine and 15mL octadecene, put the mixed solution in a four-necked bottle, heat and stir at 140°C, and repeatedly pump and fill with argon, and cycle 6 to 10 times , exhaust the oxygen and water in the reaction system, ensure that the reaction system is protected by an inert atmosphere, and continue to keep warm at 140°C for 10 minutes after the pumping is completed, so that the reactants are completely dissolved;

[0027] Step 5, heat up ...

Embodiment 2

[0030] Step 1, dissolving 6mmol of Cs(st) in 40mL of octadecene, and heating and stirring to completely dissolve it to form a cesium precursor;

[0031] Step 2, dissolve 1mL of DDAB-S in 2mL of toluene, stir evenly, and make sulfur precursor;

[0032] Step 3, dissolving 0.15 mmol of lead acetate in a mixture of 2 mL of toluene and 1 mL of oleylamine (the volume ratio of toluene and oleylamine is 1:2), stirring evenly, and forming a lead precursor;

[0033] Step 4, weigh 0.198g of PbBr 2 , dissolved in a mixed solution of 1.5mL oleic acid, 1mL oleylamine and 15mL octadecene, put the mixed solution in a four-necked bottle, heat and stir at 80°C, and repeatedly pump and fill with argon, and cycle 6 to 10 times , Exhaust the oxygen and water in the reaction system to ensure that the reaction system is protected by an inert atmosphere. After the pumping is completed, continue to keep warm at 80°C for 10 minutes to completely dissolve the reactants;

[0034] Step 5, heat up the mi...

Embodiment 3

[0036] Step 1, dissolving 6mmol of Cs(st) in 40mL of octadecene, and heating and stirring to completely dissolve it to form a cesium precursor;

[0037] Step 2, dissolve 1mL of DDAB-S in 2mL of toluene, stir evenly, and make sulfur precursor;

[0038] Step 3, dissolving 0.3 mmol of lead acetate in a mixture of 2 mL of toluene and 1 mL of oleylamine (the volume ratio of toluene and oleylamine is 1:2), stirring evenly, and forming a lead precursor;

[0039] Step 4, weigh 0.198g of PbBr 2 , dissolved in a mixed solution of 1.5mL oleic acid, 1mL oleylamine and 15mL octadecene, put the mixed solution in a four-necked bottle, heat and stir at 80°C, and repeatedly pump and fill with argon, and cycle 6 to 10 times , Exhaust the oxygen and water in the reaction system to ensure that the reaction system is protected by an inert atmosphere. After the pumping is completed, continue to keep warm at 80°C for 10 minutes to completely dissolve the reactants;

[0040]Step 5, heat up the mixe...

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Abstract

The invention discloses a method for synthetizing high-stability metal halide perovskite / lead sulfide heterostructure nanocrystals. The method comprises the following steps: firstly mixing lead halide with reactive solvent oleic acid, organic amine with long alkyl chains and octadecene in the presence of an inert gas so as to completely dissolve lead halide; then heating a mixed solution to 160-200 DEG C, rapidly injecting a caesium precursor, and reacting to generate CsPbX3; cooling to room temperature, then sequentially injecting a sulphur precursor and a lead precursor, and stirring for reaction, thereby finally obtaining the CsPbX3 / PbS heterostructure nanocrystals. The synthetized CsPbX3 / PbS heterostructure nanocrystals are uniform in appearance; the synthesis method is simple; due to epitaxial growth of lead sulfide, the perovskite performance stability is improved, and the CsPbX3 / PbS heterostructure nanocrystals are enhanced in light-emitting efficiency and are beneficial to later-stage photoelectric device assembly.

Description

technical field [0001] The invention relates to a method for synthesizing a highly stable metal halide perovskite / lead sulfide heterojunction nanocrystal, belonging to the technical field of new material preparation. Background technique [0002] Lead sulfide (PbS) quantum dots have a large exciton Bohr radius (18nn) and a small forbidden band width (0.4eV), and the forbidden band width can be continuous between 0.4-2.0eV through the quantum confinement effect Adjustable, to achieve efficient absorption of light in the range of 600nm-3000nm. Photoconductive photodetectors based on PbS quantum dots have the advantages of low preparation cost, excellent performance, high stability, and can be integrated with different substrates. They are currently a hot spot in the research of quantum dots and their applications. [0003] In recent years, due to the high energy conversion efficiency and excellent photovoltaic performance of inorganic metal halide perovskite materials, they c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66B82Y40/00
CPCB82Y40/00C09K11/661
Inventor 宋继中薛洁许蕾梦曾海波王涛李建海
Owner NANJING UNIV OF SCI & TECH
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