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Preparation method of large-grain perovskite thin film

A perovskite and large-grain technology, applied in semiconductor/solid-state device manufacturing, photovoltaic power generation, electrical components, etc., can solve problems such as difficulty in meeting commercial application standards, high preparation environment requirements, and shortened carrier lifetime. Achieve low cost, prolong carrier life, and reduce internal defects

Inactive Publication Date: 2018-05-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The pure iodine-based perovskites reported in the current literature have high requirements for the preparation environment and are sensitive to moisture in the air, making it difficult to meet commercial application standards.
The stability of the mixed anion-cation perovskite that has been studied more recently has increased compared with the pure iodine system, but there are still problems such as poor film quality, small grain size and many grain boundaries, which are easy to cause carrier recombination and shorten the current carrying capacity. sub-lifetime, degrading device performance

Method used

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  • Preparation method of large-grain perovskite thin film
  • Preparation method of large-grain perovskite thin film
  • Preparation method of large-grain perovskite thin film

Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) According to the general chemical formula FA 0.8 Cs 0.2 PB 2.68 Br 0.32 ratio, weigh the corresponding amount of 0.1376gFAI, 0.052gCsI, 0.3872gPbI 2 and 0.0588gPbBr 2 As a perovskite precursor material;

[0034] (2) According to the mass ratio of the precursor material and the solvent being 40%, take 0.8mL of DMF and DMSO mixed solvent as the perovskite precursor solution, set aside;

[0035] (3) Dissolving the precursor material in step (1) in the precursor solution in (2) to form a yellow perovskite solution for subsequent use;

[0036] (4) Weigh the Pb(SCN) with a molar ratio of 1% of the precursor material 2 0.0032g is added in the solution of described step (3) as additive;

[0037] (5) keeping the perovskite solution obtained in step (4) at room temperature for 2 hours under magnetic stirring conditions;

[0038] (6) Drop the precursor solution obtained in step (5) onto the prepared substrate, and spin coat to obtain a perovskite film. The spin coating...

Embodiment 2

[0043] (1) According to the general chemical formula FA 0.8 Cs 0.2 PB 2.68 Br 0.32 ratio, weigh the corresponding amount of 0.1376gFAI, 0.052gCsI, 0.3872gPbI 2 and 0.0588gPbBr 2 As a perovskite precursor material;

[0044] (2) According to the mass ratio of the precursor material and the solvent being 40%, take 0.8mL of DMF and DMSO mixed solvent as the perovskite precursor solution, set aside;

[0045] (3) Dissolving the precursor material in step (1) in the precursor solution in (2) to form a yellow perovskite solution for subsequent use;

[0046] (4) Weigh the Pb(SCN) with a molar ratio of 2% of the precursor material 2 0.0064g is added in the solution of described step (3) as additive;

[0047] (5) keeping the perovskite solution obtained in the step (4) at room temperature for 3 hours under magnetic stirring conditions;

[0048] (6) Drop the precursor solution obtained in step (5) onto the prepared substrate, and spin coat to obtain a perovskite film. The spin coa...

Embodiment 3

[0052] (1) According to the general chemical formula FA 0.8 Cs 0.2 PB 2.68 Br 0.32 ratio, weigh the corresponding amount of 0.1376gFAI, 0.052gCsI, 0.3872gPbI 2 and 0.0588gPbBr 2 As a perovskite precursor material;

[0053] (2) According to the mass ratio of the precursor material and the solvent being 40%, take 0.8mL of DMF and DMSO mixed solvent as the perovskite precursor solution, set aside;

[0054] (3) Dissolving the precursor material in step (1) in the precursor solution in (2) to form a yellow perovskite solution for subsequent use;

[0055] (4) Weigh the Pb(SCN) with a molar ratio of 3% of the precursor material 2 0.0096g is added in the solution of described step (3) as additive;

[0056] (5) keeping the perovskite solution obtained in step (4) at room temperature for 2 hours under magnetic stirring conditions;

[0057] (6) Drop the precursor solution obtained in step (5) onto the prepared substrate, and spin coat to obtain a perovskite film. The spin coating...

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Abstract

The invention relates to a preparation method of a large-grain perovskite thin film. The preparation method takes mixed anionic cationic perovskite as a main system, and adds Pb (SCN) 2 as an additiveto regulate and control the growth of the thin film. The method comprises a process of preparing a thin film with a mixed anion-cation type perovskite precursor solution and an additive, and calcium-titanium ore thin film which is flat and compact and has large-size crystal grains can be obtained by adjusting and controlling the Pb (SCN ) 2 additive. The preparation method is simple in process, convenient to operate and capable of effectively and rapidly forming the film. The mixed type anionic type perovskite is adopted as a main system, and the growth of the perovskite thin film is regulated and controlled by using an additive, the growth of the large-size perovskite crystal grains is realized, and the internal defects of the thin film are reduced. The service life of carriers is prolonged, the defect of grain boundaries is reduced, and the environmental stability of the perovskite thin film is greatly improved. The performance of the perovskite solar cell is enhanced, and the preparation of the highly-efficient and stable perovskite thin-film device with low hysteresis is realized.

Description

technical field [0001] The invention belongs to the field of perovskite solar cells and related optoelectronic semiconductor materials, and specifically relates to a mixed anion-cation type perovskite as the main system, adding Pb(SCN) 2 A preparation method for additives to control thin film growth. Background technique [0002] Energy issues are global issues that restrict the development of society and economy in the 21st century and in the future. The development of clean renewable energy is imminent, and solar energy has the most advantages as the largest renewable energy on the earth. Therefore, the development of cheap and efficient solar cells has become the goal pursued by people. Perovskite materials have the advantages of superior charge transport properties, long carrier diffusion distance, full-spectrum absorption, and high light absorption coefficient. Solar cells based on perovskite materials have attracted extensive attention due to their rapid improvement ...

Claims

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Application Information

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IPC IPC(8): H01L51/48H01L51/46
CPCH10K71/12H10K85/30Y02E10/549
Inventor 王世荣蔡颖李祥高肖殷
Owner TIANJIN UNIV
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