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A method for preparing methylamine lead iodine perovskite thin films based on lead xanthate complexes

A methylamine lead iodine complex technology is applied in the field of preparation of methylamine lead iodide perovskite thin films, and can solve the problem of difficult control of grain nucleation and growth process, poor film continuity, uniformity and reproducibility, and influence of The problems of improving the efficiency of perovskite thin-film solar cells, and achieving the effects of easy control of preparation parameters, high photoelectric conversion efficiency, and good repeatability

Inactive Publication Date: 2018-05-01
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complex crystal growth process involved in the preparation of methylamine lead iodine perovskite thin films by the solution method, it is difficult to control the nucleation and growth process of grains, and the prepared thin films have poor continuity, uniformity and reproducibility.
Therefore, the morphology control of methylamine-lead-iodine perovskite thin films is still a major problem in the field of perovskite thin film solar cells, which seriously affects the efficiency of perovskite thin film solar cells, thus limiting its further application.

Method used

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  • A method for preparing methylamine lead iodine perovskite thin films based on lead xanthate complexes
  • A method for preparing methylamine lead iodine perovskite thin films based on lead xanthate complexes
  • A method for preparing methylamine lead iodine perovskite thin films based on lead xanthate complexes

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Experimental program
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Embodiment 1

[0026] Dissolve 0.6412 g of potassium ethyl xanthate in 50 ml of deionized water, dissolve 0.7587 g of lead acetate in 400 ml of deionized water, add the lead acetate solution to the potassium ethyl xanthate solution, and stir at room temperature for 3 hours to obtain precipitation. Thereafter, suction was filtered, washed, and the resulting precipitate was vacuum-dried overnight. Then dissolve the precipitate in dichloromethane, add pyridine (the molar ratio of the precipitate to pyridine is 1:2), stir at room temperature for 30 minutes, and after the precipitate is completely dissolved in the solution to form a homogeneous solution, use a rotary evaporator to remove excess solvent to obtain a white powder. Dissolve the white powder in acetone, filter with suction, take the filtrate and spin evaporate the solvent, add a small amount of ethanol to wash off impurities, and filter with suction to obtain lead ethyl xanthate complex. Lead ethyl xanthate complex and CH 3 NH 3I ...

Embodiment 2

[0032] Dissolve 0.6890g of sodium n-butylxanthate in 50ml of deionized water, dissolve 0.7587g of lead acetate in 400ml of deionized water, add the lead acetate solution to the solution of sodium n-butylxanthate, stir at room temperature for 3 hours to precipitate. Thereafter, suction was filtered, washed, and the resulting precipitate was vacuum-dried overnight. Then dissolve the precipitate in dichloromethane, add pyridine (the molar ratio of the precipitate to pyridine is 1:2), stir at room temperature for 30 minutes, and after the precipitate is completely dissolved in the solution to form a homogeneous solution, use a rotary evaporator to remove excess solvent to obtain a white powder. Dissolve the white powder in acetone, filter with suction, take the filtrate and spin evaporate the solvent, add a small amount of ethanol to wash off impurities, and filter with suction to obtain lead ethyl xanthate complex. Lead ethyl xanthate complex and CH 3 NH 3 I was dissolved in ...

example 3

[0035] Dissolve 0.6973g of potassium isopropylxanthate in 50ml of deionized water, dissolve 1.0282g of lead nitrate in 400ml of deionized water, add the lead acetate solution to the potassium isopropylxanthate solution, and stir at room temperature A precipitate was obtained in 3 hours. Thereafter, suction was filtered, washed, and the resulting precipitate was vacuum-dried overnight. Then dissolve the precipitate in dichloromethane, add pyridine (the molar ratio of the precipitate to pyridine is 1:2), stir at room temperature for 30 minutes, and after the precipitate is completely dissolved in the solution to form a homogeneous solution, use a rotary evaporator to remove excess solvent to obtain a white powder. Dissolve the white powder in acetone, filter with suction, take the filtrate and spin evaporate the solvent, add a small amount of ethanol to wash off impurities, and filter with suction to obtain lead ethyl xanthate complex. Lead ethyl xanthate complex and CH 3 NH ...

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Abstract

A method for preparing a methylamine lead iodine perovskite film based on a lead xanthate complex, comprising the following steps: (1) synthesis of a lead xanthate precursor; (2) synthesis of a lead xanthate complex; (3) Preparation of methylamine lead iodide CH3NH3PbI3 perovskite thin films. The process of the invention is simple, the preparation parameters are easy to control, and the repeatability is good. It can be synthesized on a large scale, and can directly prepare a large-area, uniform, smooth, and dense high-quality CH3NH3PbI3 perovskite film, which can be used as an active layer in perovskite. In solar cell devices, higher photoelectric conversion efficiency can be obtained, which provides a new lead-containing precursor for preparing the active layer of perovskite solar cells.

Description

technical field [0001] The invention belongs to the field of material preparation, and relates to a method for preparing a methylamine-lead-iodide perovskite thin film. Background technique [0002] Organic-inorganic hybrid methylamine lead iodide perovskite material CH 3 NH 3 PB 3 It is a very important semiconductor material, which is widely used in the active layer of solar cells because of its high light absorption coefficient, long exciton lifetime, low exciton binding energy, and excellent carrier transport properties [Nat. Photonics, 2014, 8, 506-514, Science, 2013, 342, 341]. In addition, CH 3 NH 3 PB 3 It also has the advantages of being able to use solution to form a film, simple preparation process, low cost, high photoelectric conversion efficiency, and easy realization of large-area flexible devices. It has shown extremely high competitiveness in the third-generation photovoltaic technology. At present, the certified efficiency of this type of perovskite ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/48
CPCH10K71/12Y02E10/549
Inventor 姚凯李璠汪静妮王晓峰
Owner NANCHANG UNIV
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