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Perovskite solar cell with ammonium thiocyanate as intermediate layer and preparation method

A solar cell, ammonium thiocyanate technology, applied in the field of solar cells, can solve the problems of affecting the contact of the light-absorbing layer of the perovskite structure, poor film quality, and many surface hydroxyl groups, so as to promote carrier transport and reduce the formation of NiOOH. , good photoelectric performance and stability

Pending Publication Date: 2022-03-04
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Reverse structure perovskite solar cells often use NiO x As an inorganic hole transport layer, but NiO x There are many hydroxyl groups on the surface of the film, which leads to poor film quality and affects the contact with the light-absorbing layer of the perovskite structure, so it is often used in perovskite / NiO x The interface introduces an intermediate layer to improve device performance, P3HT, KCl, etc. are used to process NiO x surface, the NiO x film quality, but did not address NiO x The problem of many surface hydroxyl groups

Method used

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  • Perovskite solar cell with ammonium thiocyanate as intermediate layer and preparation method
  • Perovskite solar cell with ammonium thiocyanate as intermediate layer and preparation method
  • Perovskite solar cell with ammonium thiocyanate as intermediate layer and preparation method

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preparation example Construction

[0039] The preparation method of above-mentioned perovskite solar cell comprises the following steps:

[0040] 1), prepare NiO with a thickness of 5-100nm on the transparent conductive substrate 1 x hole transport layer 2;

[0041] 2), after fully drying, in NiO x Coating (spin-coating) NH on the hole transport layer 2 4 SCN solution, after drying at 80-150°C for 1-30min, an ultra-thin NH with a thickness of 2-20nm is formed 4 SCN middle layer 3;

[0042] Among them, NH 4 The solvent used in the SCN solution is a volatile solvent, preferably ethanol, N-N dimethylformamide (DMF) or water.

[0043] NH 4 The concentration range of SCN solution is 0.05-20.00mg / mL.

[0044] 3), in NH 4 Coating a perovskite thin film on the SCN intermediate layer 3 to form a perovskite structure light-absorbing layer 4 with a thickness of 300-500nm, and then preparing an electron transport layer 5 on the perovskite structure light-absorbing layer 4;

[0045] 4) Evaporating an electrode on t...

Embodiment 1

[0050] A kind of ammonium thiocyanate (NH 4 SCN) is NiO x The preparation method of the perovskite solar cell of the perovskite structure light-absorbing layer intermediate layer comprises the following steps:

[0051] (1) NiO x Precursor solution: Add nickel acetylacetonate and potassium acetate to the mixed solution of ethanol and acetonitrile to obtain NiO x For the precursor solution, the volume ratio of ethanol to acetonitrile is 1:19, the total concentration of nickel and potassium is 0.02mol / L, and the molar ratio of Ni:K atom is 80:20.

[0052] NiO was sprayed with a 0.3 mm caliber air spray gun x The precursor solution was sprayed on the transparent conductive substrate 1, and annealed at 450°C for 30 minutes to obtain NiO x The hole transport layer 2 has a thickness of about 30nm.

[0053] (2) A small amount of NH with a concentration of 0.20 mg / L 4 SCN ethanol solution was spin-coated on NiO at a speed of 5000rpm x On the hole transport layer 2, the spin-coat...

Embodiment 2

[0060] A kind of ammonium thiocyanate (NH 4 SCN) is NiO x The preparation method of the perovskite solar cell of the perovskite structure light-absorbing layer intermediate layer comprises the following steps:

[0061] (1) NiO x Precursor solution: Add nickel acetylacetonate, copper acetate monohydrate, lithium acetate and magnesium acetate tetrahydrate to the mixed solution of ethanol and acetonitrile to obtain NiO x For the precursor solution, the volume ratio of ethanol to acetonitrile is 1:19, the total concentration of nickel, copper, lithium and magnesium is 0.02mol / L, and the atomic molar ratio of Ni:Cu:Li:Mg is 75:10:10:5.

[0062] NiO was sprayed with a 0.3mm caliber spray gun x The precursor solution was sprayed on the transparent conductive substrate 1, and annealed at 500°C for 30 minutes to obtain NiO x The hole transport layer 2 has a thickness of 28nm. .

[0063] (2) A small amount of NH with a concentration of 0.50mg / L 4 SCN ethanol solution was spin-coa...

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Abstract

The invention discloses a perovskite solar cell with ammonium thiocyanate as an intermediate layer and a preparation method. The preparation method comprises the following steps: preparing a NiOx hole transport layer on a transparent conductive substrate; the NiOx hole transport layer is coated with an NH4SCN solution, annealing is carried out, and an NH4SCN intermediate layer is formed; coating a perovskite thin film on the NH4SCN intermediate layer to form a perovskite structure light absorption layer, and preparing an electron transport layer on the perovskite structure light absorption layer; and evaporating an electrode on the electron transport layer to form a conductive electrode. According to the perovskite solar cell, the NH4SCN intermediate layer is introduced, a hole transport layer / perovskite structure light absorption layer interface is well modified, surface defects of the hole transport layer are reduced, carrier recombination is inhibited, the photoelectric performance of the perovskite solar cell is greatly improved,-OH on the surface of NiOx is reduced due to introduction of NH4SCN, and the stability of the perovskite solar cell is greatly improved.

Description

technical field [0001] The invention belongs to the field of solar cells, and in particular relates to a perovskite solar cell with ammonium thiocyanate as an intermediate layer and a preparation method thereof. Background technique [0002] Since the industrial revolution, the use of fossil energy has provided a huge impetus for the development of human science and technology, but it has also brought about environmental problems such as the depletion of resources on the earth and environmental pollution. In order to solve these problems, the development and utilization of clean and renewable energy is very necessary. Solar energy is inexhaustible and inexhaustible, and converting solar energy into electrical energy is one of the important directions of current research. At present, in the global market, Si-based and Cd-based solar cells dominate, but their energy supply is far less than the world's photovoltaic production capacity. Cd-based solar cells are also facing the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/42H01L51/48
CPCH10K71/15H10K71/12H10K30/50H10K30/10Y02E10/549H10K85/50
Inventor 杨冠军马昕彤刘研张高李长久
Owner XI AN JIAOTONG UNIV
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