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Method of increasing perovskite film crystallinity

A technology of crystallinity and perovskite, applied in semiconductor devices, electrical components, photovoltaic power generation, etc., to achieve the effects of improving flatness, reducing preparation costs, and high repeatability

Active Publication Date: 2017-05-24
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the one-step solution method has the most advantages due to its simple operation and low cost, but the current problem is the effective control of the uniformity and crystallinity of the film.

Method used

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  • Method of increasing perovskite film crystallinity
  • Method of increasing perovskite film crystallinity
  • Method of increasing perovskite film crystallinity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Step 1: Take 2×2cm 2 The glass was ultrasonically cleaned with glass cleaner, acetone, and ethanol for 20 minutes, and then washed with N 2 blow dry.

[0026] Step 2: Add 2.3g of lead iodide and 0.8g of methyl ammonium iodide to a 10ml brown screw bottle, and then add 5ml of N,N-dimethylformamide and dimethyl sulfoxide to it, where N , The volume ratio of N-dimethylformamide and dimethyl sulfoxide is between 7:3 and 3:7. In order to promote the dissolution of the above solids, the screw bottle was sealed and placed on a magnetic stirrer at 70°C for 8 hours, and then sealed and placed on a hot plate at 70°C for use as solution A.

[0027] Step 3: Add 0.32g of zinc iodide and 0.16g of methylammonium iodide to a 10ml brown screw bottle, and then add 1ml of N,N-dimethylformamide solution to it. In order to promote the dissolution of the above solids, seal the screw bottle and place it on a magnetic stirrer at 70°C for 8 hours, then seal it and place it on a hot plate at ...

Embodiment 2

[0031] Step 1: Choose a piece with a size of 2×2cm 2 The glass was ultrasonically cleaned with glass cleaner, acetone, and ethanol for 20 minutes, and then washed with N 2 blow dry.

[0032] Step 2: Add 2.3g of lead iodide and 0.8g of methyl ammonium iodide to a 10ml brown screw bottle, and then add 5ml of N,N-dimethylformamide and dimethyl sulfoxide to it, where N , The volume ratio of N-dimethylformamide and dimethyl sulfoxide is between 7:3 and 3:7. In order to promote the dissolution of the above solids, seal the screw bottle and place it on a magnetic stirrer at 70°C for 8 hours, then seal it and place it on a hot plate at 70°C for use as solution A.

[0033] Step 3: Add 0.32g of zinc iodide and 0.16g of methylammonium iodide to a 10ml brown screw bottle, and then add 1ml of N,N-dimethylformamide solution to it. In order to promote the dissolution of the above solids, seal the screw bottle and place it on a magnetic stirrer at 70°C for 8 hours, then seal it and place i...

Embodiment 3

[0042] 1) Mix lead iodide and methyl ammonium iodide according to the molar ratio of lead:ammonium 1:1, and dissolve them in N,N-dimethylformamide, dimethyl sulfoxide or N,N-di In a mixed solution of methylformamide and dimethyl sulfoxide in any ratio, stirring at 60°C for 6 hours to obtain a perovskite precursor solution A, wherein the lead ion solubility of solution A is 0.5mol / L;

[0043] 2) Mix zinc iodide and methyl ammonium iodide according to the molar ratio of zinc:ammonium 1:1, dissolve them in N,N-dimethylformamide, and stir at 70°C for 8 hours to obtain calcium titanium Ore precursor solution B, wherein the zinc ion solubility in B solution is 0.5mol / L;

[0044] 3) Mix solution A in step 1) and solution B in step 2 according to a volume ratio of 95:5 to obtain a perovskite precursor solution, and stir at 70° C. for 4 hours to obtain a uniformly mixed solution;

[0045] 4) Put 2×2cm 2 The glass substrate was ultrasonically cleaned with glass cleaning agent, acetone...

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Abstract

The invention discloses a method of increasing perovskite film crystallinity. The method comprises the following steps of mixing lead iodide and methyl ammonium iodide and then dissolving into N, N-dimethyl formamide and dimethyl sulfoxide; mixing zinc iodide and the methyl ammonium iodide and then dissolving into the N, N-dimethyl formamide; and mixing two solutions according to a certain proportion, and then through spin coating annealing, acquiring a high-quality perovskite spin coating film. Crystallinity of a perovskite layer manufactured in the invention is good, a coverage rate is high, flatness of a perovskite film surface is greatly increased, a reaction condition is easy to control, repeatability is good and equipment is simple. The method possesses good operationality. Manufacturing cost of the perovskite film is effectively reduced. And the method can be popularized and applied to actual production.

Description

technical field [0001] The invention belongs to the technical field of perovskite solar cell preparation, in particular to a method for improving the crystallinity of a perovskite film. Background technique [0002] Perovskite materials are one of the fastest growing areas of solar research. Compared with silicon-based semiconductor materials, such materials can convert solar energy more efficiently and cheaper, so they can lead to great changes in the solar energy and electronics industries. Low cost, simple preparation process, and wide range of applications (from solar materials to mobile phones and organic light-emitting diodes (OLEDs) can be used), so that this organic-inorganic composite crystal structure material has been favored by researchers all over the world in recent years. their favor. [0003] At present, there are one-step solution method, two-step immersion method, and co-evaporation method that can be applied to prepare perovskite thin films. Among them,...

Claims

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Application Information

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IPC IPC(8): H01L51/48H01L51/42
CPCH10K71/15H10K71/12H10K71/421Y02E10/549
Inventor 阙文修阙美丹陈伟
Owner XI AN JIAOTONG UNIV
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