Method for inducing crystallization orientation of perovskite thin film and prepared solar cell

A technology of solar cells and crystal orientation, applied in the field of solar cells, can solve the problems that the grain distribution of perovskite thin films is not particularly uniform, which affects the photoelectric conversion efficiency of devices, and achieves photoelectric conversion efficiency improvement, reduction of density defects, and uniform distribution. Effect

Inactive Publication Date: 2018-11-13
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] In the prior art, lead iodide and methylammonium iodide are usually used in the precursor solution for preparing solar cell devices. The grain distribution of the perovskite thin film prepared by this precursor solution is not particularly uniform, and the There will be pinhole-type defects, which will affect the photoelectric conversion efficiency of the device; therefore, it is necessary to design a method to induce the crystallographic orientation of perovskite in a specific direction to improve the film-forming quality of the perovskite surface and make the grain distribution more accurate. Uniform, reducing pinhole defects on the surface, thereby improving the energy conversion efficiency of perovskite solar cell devices

Method used

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  • Method for inducing crystallization orientation of perovskite thin film and prepared solar cell
  • Method for inducing crystallization orientation of perovskite thin film and prepared solar cell
  • Method for inducing crystallization orientation of perovskite thin film and prepared solar cell

Examples

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Embodiment 1

[0023] Embodiment one: use lead iodide (PbI 2 ) and methyl ammonium chloride (MACl) induced perovskite crystal orientation films to prepare reverse planar perovskite solar cell devices.

[0024] Step 1: The glass substrate engraved with ITO electrodes was ultrasonically cleaned in deionized water, acetone, and ethanol for 14 minutes each, and after thorough cleaning, it was placed in an ozone plasma processor to clean the surface for 5 minutes.

[0025] Step 2: Preparation of the hole transport layer: the prepared NiOx solution was spin-coated on the ITO glass at a speed of 4000 rpm, and then annealed at 130°C for 10 min.

[0026] Step 3: Preparation of precursor solution: lead iodide (PbI 2 ) and methylammonium chloride (MACl) are dissolved in a mixed solvent of dimethylamide (DMF) and dimethyl sulfoxide (DMSO) with a volume ratio of 1:1 at a molar ratio of 1:1, and the precursor solution The final molarity was 1.18 mol / L, and stirred at room temperature for 2 h.

[0027] ...

Embodiment 2

[0030] Embodiment two: use lead iodide (PbI 2 ) and methylammonium iodide (MAI) to prepare reverse planar perovskite solar cell devices.

[0031] The difference from the preparation steps in Example 1 is Step 3, and all other steps and methods are exactly the same as in Example 1.

[0032] Step 3 of this embodiment: preparation of perovskite film precursor solution: lead iodide (PbI 2 ) and methylammonium iodide (MAI) were dissolved in dimethylamide (DMF) and dimethyl sulfoxide (DMSO) solvents with a volume ratio of 1:1 at a molar ratio of 1:1, and the final molar concentration of the precursor solution 1.18 mol / L, and stirred at room temperature for 2 h.

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Abstract

The invention discloses a method for inducing crystallization orientation of a perovskite thin film. A preparation method of the perovskite thin film comprises steps as follows: a substrate is spin-coated with a precursor solution at the rotating speed of 3,000-4,000 rpm and annealed at the temperature of 100-110 DEG C for 30-60 s, wherein the precursor solution is formed as follows: PbI2 and MAClin the molar ratio being 1:1 are firstly dissolved in a mixed solvent of DMF (dimethylformamide) and DMSO (dimethyl sulfoxide) in the volume ratio being 1:1 and then stirred at the room temperature for 2 h, and the final molar concentration of the precursor solution is 1.0-1.2 mol/L. Organic metal halide is used for inducing crystallization orientation of the perovskite thin film, the perovskitethin film with good film properties is obtained for preparation of a reversal planar perovskite solar cell device, and the photoelectric conversion efficiency of the solar cell device is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to a method for inducing the crystal orientation of a perovskite thin film. Background technique [0002] In recent years, with the vigorous development of the optoelectronic field, organometal halide perovskites have received more and more attention as a promising photovoltaic material for solar cells, which have high energy conversion efficiency ( Excellent properties such as PCE) and low-cost manufacturing process have attracted scholars at home and abroad to study and have achieved remarkable results. The energy conversion efficiency of perovskite solar cells has also jumped from the initial 3.8% to 22%. Approaching the energy conversion efficiency of commercial silicon-based solar cells. These remarkable results can all be attributed to the unique properties of perovskites. [0003] For devices with perovskite thin films as active layers, the unit cell growth ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/42H01L51/48
CPCH10K71/12H10K30/15Y02E10/549
Inventor 曾文进李志闵永刚崔岱麒刘泽邓云恺
Owner NANJING UNIV OF POSTS & TELECOMM
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