Perovskite solar cell based on halogen-free lead source and preparation method of perovskite solar cell

A solar cell and perovskite technology, applied in the field of solar cells, can solve problems such as difficult preparation, and achieve the effects of good film formation, low defect density and large grain size

Active Publication Date: 2021-06-04
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The HenryJ.Snaith group found that the use of non-halogenated lead sources Pb(Ac) in the glove box 2 Instead of lead halide, perovskite crystals grow much faster, and after only a few minutes of annealing, an ultra-smooth and almost pinhole-free perovskite film can be obtained with a simple one-step solution coating. Difficult to prepare in air

Method used

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  • Perovskite solar cell based on halogen-free lead source and preparation method of perovskite solar cell
  • Perovskite solar cell based on halogen-free lead source and preparation method of perovskite solar cell
  • Perovskite solar cell based on halogen-free lead source and preparation method of perovskite solar cell

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Embodiment 1

[0023] A method for preparing a perovskite solar cell based on a non-halogen lead source, comprising the following steps:

[0024] (1) Substrate cleaning: clean the surface dirt of the transparent conductive substrate FTO with a detergent. Then place it in deionized water, acetone, isopropanol and ethanol in order to ultrasonically clean it for 10-15 minutes, and finally soak it in ethanol solution for storage. Before use, dry it with nitrogen and clean it with an ultraviolet ozone machine for 15-30 minutes.

[0025] (2) Electron transport layer preparation: commercial 15% SnO 2 The colloidal aqueous solution and deionized water were prepared at a mass ratio of 1:5 to make 2.5% SnO 2 Colloidal solution, stirred for one hour and set aside. Pipette 90 μl of SnO 2 The precursor solution was evenly dropped on the treated FTO transparent conductive substrate. The spin-coating conditions were low speed 500r / min for 3s, high speed 3000r / min for 30s, and annealing on a heating plat...

Embodiment 2

[0031] A method for preparing a perovskite solar cell based on a non-halogen lead source, the difference between this embodiment and embodiment 1 is: the preparation of the perovskite light-absorbing layer: Pb(SCN) 2 : Pb(Ac) 2 A non-halogenated lead source mixed in a molar ratio of 1:3 with CH 3 NH 3 I is dissolved in the mixed solution of dimethylformamide (DMF) and dimethyl sulfoxide (DMSO) at a molar ratio of 1:3 (V 1 :V 2 =4:1), stirred overnight at 70°C, and filtered before use. Use a pipette gun to draw 50 μl of the filtered perovskite precursor solution, and drop it evenly on the SnO 2On the substrate of the electron transport layer, spin coat with a coater at a speed of 5000r / min for 30s, and add ethyl acetate dropwise evenly and rapidly at the penultimate 15s to 5s after the spin coating. Then transfer the perovskite mesophase film to a hot stage for annealing, pre-anneal at 70°C for 3 minutes, and anneal at 100°C for 15 minutes to obtain the perovskite light-ab...

Embodiment 3

[0034] A method for preparing a perovskite solar cell based on a non-halogen lead source, the difference between this embodiment and embodiment 1 is:

[0035] Electron transport layer preparation: Commercial 15% SnO 2 Colloidal aqueous solution and deionized water were prepared to make 2% SnO 2 Colloidal solution, stirred for one hour and set aside. Pipette 100 μl of SnO 2 The precursor solution was evenly dropped on the treated FTO transparent conductive substrate. The spin-coating conditions were low speed 500r / min for 3s, high speed 3000r / min for 30s, and annealing on a heating plate at 60°C for 30min to obtain SnO 2 electron transport layer.

[0036] Preparation of perovskite light-absorbing layer: Pb(SCN) 2 : Pb(Ac) 2 A non-halogenated lead source mixed in a molar ratio of 1:1 with CH 3 NH 3 I is dissolved in the mixed solution of dimethylformamide (DMF) and dimethyl sulfoxide (DMSO) according to molar ratio 1:3.2 (V 1 :V 2 =9:1), stirred overnight at 70°C, and f...

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Abstract

The invention relates to the technical field of solar cells, in particular to a perovskite solar cell based on a non-halogen lead source and a preparation method of the perovskite solar cell. The perovskite solar cell based on the halogen-free lead source comprises a transparent conductive substrate, and a metal oxide electron transport layer, a perovskite light absorption layer, a Spiro-OMeTAD hole transport layer and a metal electrode layer which are sequentially stacked on the surface of the transparent conductive substrate, and the perovskite light absorption layer is prepared by spin-coating a non-halogen lead source and a green anti-solvent in the air by a one-step method. The perovskite light absorption layer is prepared in the air by adopting the halogen-free lead source and the green anti-solvent, the limitation that a conventional PbI2 source is sensitive to humidity and needs to be prepared in a glove box is overcome, and the economic burden brought by large-scale industrial production of perovskite cells is reduced. The perovskite light absorption layer prepared by the method is good in film-forming property, small in defect density, large in grain size, high in crystallinity and strong in orientation, and the perovskite battery prepared by the perovskite light absorption layer has the advantages of high conversion efficiency and good stability.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a perovskite solar cell based on a non-halogen lead source and a preparation method thereof. Background technique [0002] With global warming and the gradual depletion of fossil energy, the exploration of clean alternative energy has become more and more urgent. As a renewable energy on the earth, solar energy has the advantages of non-toxic, clean, and inexhaustible. Humans use solar energy in the following ways: photothermal conversion, photochemical conversion and photoelectric conversion. Solar cells use photoelectric important device for transformation. Since the discovery of the photovoltaic effect by French physicist Becquerel in 1839, solar cells have experienced the first generation of monocrystalline silicon and polycrystalline silicon solar cells, the second generation of amorphous silicon and compound thin film solar cells, and the third generation of organic an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/42H01L51/44H01L51/48
CPCH10K71/12H10K30/10H10K30/80Y02E10/549
Inventor 台启东王珍
Owner WUHAN UNIV
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