A kind of cesium tin iodide thin film, its preparation method and application

A technology of thin film and solution method, which is applied in the field of perovskite photodetectors to achieve the effect of smooth and dense surface, high absorption intensity and high purity of double perovskite phase

Active Publication Date: 2021-10-29
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Cs 2 SnI 6 Thin films using similar processes have rarely been reported

Method used

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  • A kind of cesium tin iodide thin film, its preparation method and application
  • A kind of cesium tin iodide thin film, its preparation method and application
  • A kind of cesium tin iodide thin film, its preparation method and application

Examples

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Effect test

Embodiment 1

[0027] A kind of solution method prepares cesium tin iodide (Cs 2 SnI 6 ) thin film method comprising the steps of:

[0028] (1) Weigh 117mg of cesium iodide and 282mg of tin iodide, add 0.5ml of mixed solvent of DMSO and DMF (the volume ratio of DMSO and DMF is 3:1), stir at 60°C and 1000 rpm Dissolved and made into 0.45mol / L Cs 2 SnI 6 The precursor solution;

[0029] (2) Place the solution prepared in step (1) under a nitrogen atmosphere for 7 days to age;

[0030] (3) Use a pipette gun to take 60 μL of the aged solution and drop it on a clean FTO glass substrate (1.6mm*1.8mm), and prepare Cs by spin coating 2SnI 6 Film, specifically, the rotation speed of the first stage is 1000 rpm, and the time is 10 seconds; the rotation speed of the second stage is 2500 rpm, and the time is 60 seconds; 200 µl isopropanol. Then place the substrate on a hot stage with a temperature of 50° C. and heat it for 20 minutes;

[0031] (4) After the substrate is naturally cooled to room...

Embodiment 2

[0036] A kind of solution method prepares cesium tin iodide (Cs 2 SnI 6 ) thin film method comprising the steps of:

[0037] (1) Weigh 468mg of cesium iodide and 564mg of tin iodide, add 1.0ml of DMSO and DMF mixed solution (the volume ratio of DMSO and DMF is 1:0), stir and dissolve at 60 degrees Celsius and 1000 rpm , dubbed 0.9mol / L Cs 2 SnI 6 The precursor solution;

[0038] (2) Place the solution prepared in step (1) at room temperature for 30 days;

[0039] (3) Use a pipette gun to take 60 μL of the aged solution and drop it on a clean FTO glass substrate (1.6mm*1.8mm), and prepare Cs by spin coating 2 SnI 6 Film, specifically, the rotation speed of the first stage is 1000 rev / min, and the time is 10 seconds; 200 µl isopropanol. Then place the substrate on a hot stage with a temperature of 30° C. and heat it for 40 minutes;

[0040] (4) After the substrate is naturally cooled to room temperature, 100 microliters of 10 mg / ml tin iodide isopropanol solution is dro...

Embodiment 3

[0043] A kind of solution method prepares cesium tin iodide (Cs 2 SnI 6 ) thin film method comprising the steps of:

[0044] (1) Weigh 117mg of cesium iodide and 564mg of tin iodide, add 1.0ml of DMSO and DMF mixed solution (the volume ratio of DMSO and DMF is 6:1), stir and dissolve at 60°C and 1000 rpm , dubbed 0.225mol / L of Cs 2 SnI 6 The precursor solution;

[0045] (2) Place the solution prepared in step (1) at room temperature for 4 days;

[0046] (3) Use a pipette gun to take 60 μL of the aged solution and drop it on a clean FTO glass substrate (1.6mm*1.8mm), and prepare Cs by spin coating 2 SnI 6 Film, specifically, the rotation speed of the first stage is 1000 rev / min, and the time is 10 seconds; 500 µl isopropanol. Then place the substrate on a hot stage with a temperature of 70° C. and heat it for 1 minute;

[0047] (4) After the substrate is naturally cooled to room temperature, 40 microliters of 1mg / ml tin iodide isopropanol solution is dropped on it, and...

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Abstract

The invention discloses a cesium tin iodide film, its preparation method and application, the Cs 2 SnI 6 The preparation method of the film comprises the following steps: (1) adding cesium iodide and tin iodide into DMSO or a mixed solvent of DMSO and DMF, stirring and dissolving at 20-70°C, and preparing Cs 2 SnI 6 Precursor solution; (2) Precursor solution prepared in step (1) in N 2 After standing and aging in the atmosphere for 3 to 10 days, the precursor film was deposited on the substrate by spin coating; (3) the precursor film obtained in step (2) was placed on a hot stage with a temperature of 30-70°C Stand still for 1.0min~40min; then put it on the spin coater, drop 40μL-100μL supplementary solution, and spin coat dry after dripping the solution; (4) Anneal the film obtained in step (3) to obtain Cs 2 SnI 6 film.

Description

technical field [0001] The invention belongs to the field of perovskite photoelectric detectors, in particular to a cesium tin iodide thin film, its preparation method and application. Background technique [0002] Organic-inorganic hybrid lead halide perovskites (OIHPs) are a new type of optoelectronic materials that have emerged in recent years, among which organic-inorganic hybrid perovskite thin-film photodetectors (Photodetectors, PDs) benefit from lower preparation And material cost, simple preparation process, easy flexible integration and other characteristics, it has developed rapidly. Most of the currently studied PDs mainly use the toxic lead element, which is easy to pollute the environment. Tin element is often used instead of lead in non-lead perovskite thin film photodetectors, but the tin in the pure tin perovskite of photodetectors with better performance is +2, which is easily oxidized to +4 in the air. However, tin with high valence can easily lead to a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/48H01L51/42H01L51/44H01L51/00
CPCH10K71/00H10K71/40H10K30/10H10K30/80H10K2102/00Y02E10/549
Inventor 黄军意谭付瑞梅延涛高跃岳董琛刘荣岳根田张伟风
Owner HENAN UNIVERSITY
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