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Preparation method of needle-shaped two-dimensional organic-inorganic perovskite (C4H9NH3)2PbI4 micro-nano crystals

An inorganic calcium and organic technology, applied in the field of preparation of micro-nano needle crystals, can solve problems affecting the quality of thin-film crystals and device performance, and achieve the effect of low cost, simple equipment and preparation process

Inactive Publication Date: 2019-08-23
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the unavoidable grain boundaries and crystal defects in the thin film preparation process often seriously affect the crystal quality of the thin film and ultimately affect the device performance.

Method used

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  • Preparation method of needle-shaped two-dimensional organic-inorganic perovskite (C4H9NH3)2PbI4 micro-nano crystals
  • Preparation method of needle-shaped two-dimensional organic-inorganic perovskite (C4H9NH3)2PbI4 micro-nano crystals
  • Preparation method of needle-shaped two-dimensional organic-inorganic perovskite (C4H9NH3)2PbI4 micro-nano crystals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] PB 2 Pre-deposition film preparation: weigh 50mg PbI 2 The powder was placed in a vial filled with 1ml of DMF and dissolved by ultrasonic vibration to obtain a light yellow clear solution. Place the glass slide in alcohol, ultrasonically clean it for 15 minutes, take it out, and wash it with N 2 blow dry. Drops of pale yellow PbI 2 Put 1 to 2 drops of the solution on the glass substrate, spread it as evenly as possible, and dry it to get PbI 2 Pre-deposited thin film (thickness 100nm).

[0027] C 4 h 9 NH 3 I precursor solution preparation: weigh 20mg C 4 h 9 NH 3 I powder is placed in a small medicine bottle filled with 1ml isopropanol, dissolved by ultrasonic vibration, and brown clear C is obtained. 4 h 9 NH 3 I precursor solution.

[0028] Acicular (C 4 h 9 NH 3 ) 2 PB 4 Preparation of micro-nano crystals: the pre-deposited PbI 2 Film glass slices cut into 1mm 2 Left and right small pieces of glass, dipped in C 4 h 9 NH 3 I precursor solution...

Embodiment 2

[0030] PB 2 Pre-deposition film preparation: weigh 50mg PbI 2 The powder was placed in a vial containing a mixed solution of 0.67ml DMF and 0.33ml toluene, and dissolved by ultrasonic vibration to obtain a light yellow clear solution. Place the glass slide in alcohol, ultrasonically clean it for 15 minutes, take it out, and wash it with N 2blow dry. Preparation of PbI on Glass Lining by Spin Coating 2 For the pre-deposited film, the rotation speed of the spin coater is 1000 rpm, and the time is 30 seconds. Dry to get PbI 2 Pre-deposited thin film (thickness 200nm).

[0031] C 4 h 9 NH 3 I precursor solution preparation: weigh 30mg C 4 h 9 NH 3 I powder is placed in a small medicine bottle filled with 1ml isopropanol, dissolved by ultrasonic vibration, and brown clear C is obtained. 4 h 9 NH 3 I precursor solution.

[0032] Acicular (C 4 h 9 NH 3 ) 2 PB 4 Preparation of micro-nano crystals: the pre-deposited PbI 2 Film glass slices cut into 1mm 2 Left and ...

Embodiment 3

[0034] PB 2 Pre-deposition film preparation: weigh 100mg PbI 2 The powder was placed in a vial containing a mixed solution of 0.67ml DMF and 0.33ml toluene, and dissolved by ultrasonic vibration to obtain a light yellow clear solution. Place the glass slide in alcohol, ultrasonically clean it for 15 minutes, take it out, and wash it with N 2 blow dry. Drops of pale yellow PbI 2 Put 1 to 2 drops of the solution on the glass substrate, spread it as evenly as possible, and dry it to get PbI 2 Pre-deposited thin film (thickness 100nm).

[0035] C 4 h 9 NH 3 I precursor solution preparation: weigh 50mg C 4 h 9 NH 3 I powder is placed in a small medicine bottle filled with 1ml isopropanol, dissolved by ultrasonic vibration, and brown clear C is obtained. 4 h 9 NH 3 I precursor solution.

[0036] Acicular (C 4 h 9 NH 3 ) 2 PB 4 Preparation of micro-nano crystals: the pre-deposited PbI 2 Film glass slices cut into 1mm 2 Left and right small pieces of glass, dipped...

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Abstract

The invention provides a preparation method of needle-shaped two-dimensional organic-inorganic perovskite (C4H9NH3)2PbI4 micro-nano crystals. The method comprises the following steps: weighing PbI2 powder, dissolving the weighed powder into a mixed solvent of DMF and toluene to obtain a Pb precursor solution, performing drop coating or spin coating on a substrate by using the Pb precursor solution, and performing drying to obtain a PbI2 pre-deposited film; weighing C4H9NH3I powder, dissolving the weighed powder into isopropyl alcohol to obtain an organic amine precursor solution; and immersingthe PbI2 pre-deposited film into the organic amine precursor solution for 10 h or more, and taking out the product to obtain the needle-shaped two-dimensional organic-inorganic perovskite (C4H9NH3) 2PbI4 micro-nano crystals. The preparation method provided by the invention can be carried out in the air or at a room temperature, and has the characteristics of a simple device and preparation process and low costs.

Description

[0001] (1) Technical field [0002] The invention relates to the field of preparation of nanometer materials, in particular to a method for preparing micronano needle crystals which can be used as nanometer optoelectronic materials. [0003] (2) Background technology [0004] Two-dimensional organic / inorganic perovskites have the chemical formula (R-NH 3 ) 2 MX 4 or (NH 3 -R-NH 3 )MX 4 , where R is a long chain hydrocarbon or aromatic hydrocarbon, M is a divalent metal ion such as Pb 2+ , Sn 2+ 、Cu 2+ etc., X is the halide ion Cl - 、Br - , I - Wait. Its crystal structure exhibits common-top-connected [MX 6 ] 4- A layered structure in which inorganic octahedral layers and organic ammonium ion layers are alternately stacked. The inorganic layer usually has a larger dielectric constant and a smaller band gap, and is a potential well layer; the organic layer usually has a smaller dielectric constant and a larger band gap, and is a potential barrier layer. Alternately...

Claims

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Application Information

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IPC IPC(8): C30B29/54C30B7/14
CPCC30B7/14C30B29/54
Inventor 马德伟潘诚达何一丹
Owner ZHEJIANG UNIV OF TECH
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