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A method for preparing perovskite solar cells based on two-dimensional material graphene phase carbon nitride

A technology of olefinic carbon nitride and solar cells, applied in circuits, electrical components, photovoltaic power generation, etc., to achieve the effects of simple and easy to obtain, slow down volatilization, and low price

Active Publication Date: 2020-02-14
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the shortcomings of the existing pure organic-inorganic hybrid perovskite film with many crystal defects, the film is not dense, and there are many grain boundaries formed during the crystallization process, the present invention provides a two-dimensional material graphene phase carbon nitride (g-C 3 N 4 ) is used as an additive to intervene in the perovskite precursor solution to prepare a perovskite solar cell. This preparation method introduces a non-toxic two-dimensional material as an additive without changing the device preparation process, effectively improving the The crystalline state of the perovskite film reduces film defects, making the device stable and improving the photoelectric conversion efficiency of the device

Method used

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  • A method for preparing perovskite solar cells based on two-dimensional material graphene phase carbon nitride
  • A method for preparing perovskite solar cells based on two-dimensional material graphene phase carbon nitride
  • A method for preparing perovskite solar cells based on two-dimensional material graphene phase carbon nitride

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1: use g -C 3 N 4 Preparation of perovskite solar cells by doping perovskite precursor solution:

[0033] The device structure of the battery is: FTO / TiO 2 / Perovskite layer (Perovskite) / Spiro-OMeTAD / MoO 3 / Ag

[0034] The preparation method of perovskite precursor solution in this example is as follows: g -C 3 N 4 Different solvents are used to configure the precursor additives. The solvents used are DMF, DMSO, and ethanol respectively. The precursor additives are added to the perovskite precursor solution according to a certain doping ratio. The preparation method of the perovskite precursor is as follows: MAI with PbI 2 The molar ratio is 1:1, that is, 1 mole is weighed and added to 1 ml of mixed solvent DMSO and GBL, and the volume ratio of DMSO and GBL in the mixed solvent is 3:7. The amount of precursor additive added is 30 μL, each solvent configuration g -C 3 N 4 The doping mass fractions were 0.30 wt%, 0.60 wt%, 1.20 wt%, respectively. ...

Embodiment 2

[0040] Embodiment 2: with doping g -C 3 N 4 The perovskite precursor solution of the precursor additive is prepared into a perovskite solar cell:

[0041] The device structure of the battery is: FTO / TiO 2 / Perovskite / Spiro-OMeTAD / MoO 3 / Ag

[0042] The preparation method of the perovskite precursor solution in this example is as follows: the configuration g -C 3 N 4 The solvents DMF, DMSO, and ethanol used in the precursor additives were added to the perovskite precursor solution in the same amount as in Example 1 (the amount of the solvent was 30 μL) to prepare a perovskite solar cell device.

[0043] The preparation process of perovskite solar cells:

[0044] (1) The processing method of the substrate is the same as in Example 1, and the deposited TiO 2 The FTO substrate was placed in an ozone machine for 25 minutes of ozone treatment, and then taken out and transferred to the glove box. The perovskite precursor solutions doped and undoped with DMF, DMSO, and ethano...

Embodiment 3

[0048] Embodiment 3: use g -C 3 N 4 (Under the same doping ratio, different configuration solvent conditions) the preparation process of doping perovskite precursor solution to prepare perovskite solar cells:

[0049] The device structure of the battery is: FTO / TiO 2 / Perovskite / Spiro-OMeTAD / MoO 3 / Ag

[0050] The preparation method of perovskite precursor solution in this example is as follows: g -C 3 N 4 Use different solvents to prepare precursor additives. The solvents used are DMF, DMSO, and ethanol respectively. Add calcium Devices are prepared in the titanium ore precursor solution;

[0051] The formation process of the perovskite layer:

[0052] (1) The processing method of the substrate is the same as in Example 1, and the deposited TiO 2 The FTO substrate was placed in an ozone machine for 25 minutes of ozone treatment, and then it was taken out and transferred to the glove box. The doped and undoped perovskite materials were respectively formed on the sub...

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Abstract

The invention provides a method for preparing a perovskite solar cell based on a two-dimensional material graphene-phase carbon nitride, and doping a graphene-phase carbon nitride into a perovskite precursor solution to prepare a perovskite solar cell. The method has the following advantages: (1) The raw materials required for material synthesis are cheap and the product toxicity is small; (2) The volatilization of the solvent during the annealing process is effectively slowed down, making the crystallization of the perovskite film more uniform and dense; (3) The perovskite layer is enlarged The size of the crystal grain can effectively reduce the grain boundary where charges are easy to recombine, and improve the device filling factor; (4) passivate the surface of the perovskite film, effectively improve the hysteresis of the device; (5) improve the conductivity of the perovskite film surface, Effectively reduce the interface contact resistance and increase the short-circuit current of the device. The manufacturing process of the invention is simple and convenient, and the preparation difficulty is low; through the doping of graphene-phase carbon nitride, the flatness and uniformity of the perovskite film are effectively improved, and through a series of gradient doping, the performance of the device is significantly changed.

Description

technical field [0001] The invention belongs to the field of photovoltaic devices, and in particular relates to a method for preparing a perovskite solar cell based on a two-dimensional material graphene phase carbon nitride. Background technique [0002] Organic-inorganic hybrid perovskite solar cells are considered to be a form of energy comparable to inorganic silicon solar cells due to their unique optical properties and simple fabrication process. After several years of development, its photoelectric conversion efficiency has exceeded 22%. People have conducted a series of in-depth research on materials, thin film preparation technology, device structure and physical mechanism. Perovskite solar cells have two device structures: planar and porous. Planar perovskite cells have attracted widespread attention due to their simple fabrication process and low-temperature thin-film processing technology. In the planar structure, the perovskite layer is between the electron tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/42H01L51/48
CPCH10K71/12H10K30/151Y02E10/549
Inventor 王照奎廖良生姜璐璐
Owner SUZHOU UNIV
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