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Method for preparing perovskite film based on two-step printing

A perovskite and thin film technology, which is applied in the field of perovskite thin film preparation based on two-step printing, can solve the problems of uneven composition of inorganic groups and increased production costs, and achieve high-speed continuous preparation, bright surface, and promote evenly generated effect

Pending Publication Date: 2019-03-08
麦耀华 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The use of nitrogen air knife will cause uneven film formation of inorganic components due to the difference in air volume, and also increase the preparation cost

Method used

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  • Method for preparing perovskite film based on two-step printing
  • Method for preparing perovskite film based on two-step printing
  • Method for preparing perovskite film based on two-step printing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Small area (2.5×2.5cm 2 ) and large-area perovskite films (9.5×8cm 2 ) and the preparation of corresponding solar cells:

[0035] 1) Use DMSO:DMF=9:1 as a mixed solvent to prepare PbI with a concentration of 461mg / mL 2 solution, a layer of PbI was coated on top of the conductive ITO substrate using doctor blade coating technique 2 , to get PbI 2 Liquid film, the color is light yellow; the height between the scraper and the ITO substrate is 150 microns, when using a small area substrate (2.5 × 2.5cm 2 ) of PbI 2 The volume of the solution is 25 μL, when using a large area substrate (9.5×8cm 2 ) of PbI 2 The amount of the solution used was 200 μL, the moving speed of the scraper was 10 mm / s, and the temperature of the coating hot table was room temperature 25° C.

[0036] 2) The coated PbI 2 The liquid film is placed in a vacuum chamber, and the chamber is evacuated to keep the chamber pressure at 800Pa, and the pressure is maintained in this vacuum environment fo...

Embodiment 2

[0042] Small area (2.5×2.5cm 2 )MA 0.9 Cs 0.1 PB 3 Preparation of perovskite thin films:

[0043] 1) Use DMSO:DMF=1:1 as a mixed solvent to prepare PbI 2 and CsI concentrations are respectively 461mg / mL and 26mg / mL mixed solution, using doctor knife coating technology to coat a layer of said mixed solution on the conductive FTO substrate, the obtained PbI 2 -CsI liquid film color is pale yellow. The height between the scraper and the ITO substrate is 150 microns, PbI 2 The amount of the solution used was 25 μL, the moving speed of the scraper was 10 mm / s, and the temperature of the coating hot stage was 25° C. at room temperature.

[0044] 2) The coated PbI 2 -The CsI liquid film is placed in a vacuum chamber, and the chamber is evacuated to keep the chamber pressure at 500Pa, and the pressure is maintained in this vacuum environment for 30 seconds. At this time, most of the solvent in the liquid film escapes from the liquid film to form supersaturation solution to giv...

Embodiment 3

[0047] Small area (2.5×2.5cm 2 )MAPbI 2.7 Br 0.3 Preparation of perovskite thin films:

[0048] With reference to the preparation method of the perovskite film in Example 1, the difference is that the inorganic components used in step 1) are PbI with a total concentration of 1M 2 -PbBr 2 (molar ratio 0.9:0.1), the solvent is DMF:DMSO=6:4.

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Abstract

The invention relates to a method for preparing a perovskite film based on two-step printing. The method comprises the following three steps: 1) a perovskite inorganic component solution is printed and applied on the surface of a substrate, and vacuum treatment and annealing are carried out to obtain an inorganic component film; 2) organic components are printed and applied on the inorganic component film, and a reaction is carried out to obtain a perovskite intermediate phase; and 3) the perovskite intermediate phase is annealed to obtain the perovskite film. According to the method disclosedby the invention, coated inorganic components are subjected to the vacuum treatment, so that an excessive solvent in a liquid film can be fully extracted, uniform generation of crystal nucleuses of the inorganic components is promoted, and the inorganic component film which is good in crystallinity and bright in surface and has a mesoporous structure is obtained.

Description

technical field [0001] The invention belongs to the technical fields of photoelectric thin film preparation and solar cells, and in particular relates to a method for preparing perovskite thin films based on two-step printing. Background technique [0002] Today's energy shortage and environmental problems caused by burning fossil energy restrict the sustainable development of society. Using solar power to generate electricity is one of the effective means to alleviate the current energy and environmental crisis. Perovskite solar cells are new thin-film solar cells developed in recent years. As a high-efficiency solar cell that can be prepared by simple solution processing, it has received a research boom in the field of photovoltaics all over the world. The efficiency of small-area perovskite cells prepared by the current laboratory based on the spin-coating process has reached 23.2%. However, due to the defects of the spin-coating process itself, it is easy to cause unev...

Claims

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Application Information

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IPC IPC(8): H01L51/42H01L51/48
CPCH10K71/13H10K71/135H10K30/00Y02E10/549
Inventor 郭飞麦耀华何文鑫
Owner 麦耀华
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