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Tungsten oxide electron transport layer, preparation method and application in perovskite solar cells

An electron transport layer, solar cell technology, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of unsatisfactory film uniformity, unfavorable requirements, poor controllability of tungsten oxide film thickness, etc., to achieve uniform morphology , the structure is dense, the effect of strong stability

Active Publication Date: 2019-10-01
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the thickness controllability of the tungsten oxide film prepared by the hydrothermal method is poor, which is not conducive to the requirement of the thinner electron transport layer required in the perovskite solar cell
The tungsten oxide film prepared by the electrochemical deposition method has poor bonding with the conductive substrate, and the uniformity of the obtained film is not ideal

Method used

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  • Tungsten oxide electron transport layer, preparation method and application in perovskite solar cells
  • Tungsten oxide electron transport layer, preparation method and application in perovskite solar cells
  • Tungsten oxide electron transport layer, preparation method and application in perovskite solar cells

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Experimental program
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Effect test

Embodiment 1

[0032] (1) Dissolve 2.4g tungstic acid in 30mL hydrogen peroxide, and stir to obtain milky white A solution;

[0033] (2) Heat solution A to 100°C and reflux for 0.5 hours to obtain transparent solution B;

[0034] (3) Add 35 mL of isopropanol and 50 mL of distilled water to solution B, and heat at 95°C for 5 minutes to obtain solution C;

[0035] (4) Add 200mL of isopropanol to solution C, continue heating at 95°C for 1 hour to obtain colorless transparent sol D;

[0036] (5) Spray 20mL of sol D on the clean FTO conductive glass for 10 minutes at a spraying speed of 2mL / min;

[0037] (6) The sprayed substrate was heated on a heating platform at 500°C for 30 minutes to obtain a tungsten oxide electron transport layer film material with good properties.

[0038] On the basis of the prepared electron transport layer, spin-coat titanium dioxide porous layer, zirconium dioxide spacer layer, perovskite layer, and print carbon electrodes to prepare a perovskite solar cell structur...

Embodiment 2

[0040] (1) Dissolve 2.5g tungstic acid in 30mL hydrogen peroxide, and stir to obtain milky white A solution;

[0041] (2) Heat solution A to 95°C for 1 hour to obtain transparent solution B;

[0042] (3) Add 35 mL of absolute ethanol and 50 mL of distilled water to solution B, and heat at 95°C for 5 minutes to obtain solution C;

[0043] (4) Add 150 mL of absolute ethanol to solution C, and continue heating at 95°C for 1 hour to obtain a colorless transparent sol D;

[0044] (5) Spray 40mL of sol D on the clean FTO conductive glass for 20 minutes at a spraying speed of 2mL / min;

[0045] (6) The sprayed substrate was heated on a heating platform at 500°C for 20 minutes to obtain a tungsten oxide electron transport layer film material with good properties. figure 1 It is the scanning electron micrograph of the tungsten oxide thin film that embodiment 2 makes magnified 50000 times; figure 2 It is a 25,000-fold magnified cross-sectional scanning electron microscope photo of th...

Embodiment 3

[0047] (1) Dissolve 3g of tungstic acid in 35mL of hydrogen peroxide, and stir to obtain milky white A solution;

[0048] (2) Heat solution A to 100°C and reflux for 0.5 hours to obtain transparent solution B;

[0049] (3) Add 30mL absolute ethanol and 50mL distilled water to solution B, and heat at 100°C for 20 minutes to obtain solution C;

[0050] (4) Add 200 mL of absolute ethanol to solution C, and continue heating at 100°C for 1 hour to obtain a colorless transparent sol D;

[0051] (5) Spray 30mL of sol D on the clean FTO conductive glass for 15 minutes at a spraying speed of 2mL / min;

[0052](6) The sprayed substrate was heated on a heating platform at 500°C for 40 minutes to obtain a tungsten oxide electron transport layer film material with good properties.

[0053] On the basis of the prepared electron transport layer, a titanium dioxide porous layer, a zirconium dioxide spacer layer, a perovskite layer were spin-coated, and carbon electrodes were printed, and the...

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Abstract

The invention discloses a tungsten oxide electron transport layer, a preparation method and an application in perovskite solar cells. The preparation method of the invention includes the following steps: (1) dissolving tungstic acid in dioxygen water, and carrying out stirring to obtain milky white solution A; (2) heating the solution A for reaction to obtain transparent solution B; (3) adding anorganic solvent and distilled water to the solution B, and carrying out heating reaction to obtain solution C; (4) adding an organic solvent to the solution C, and carrying out heating reaction to obtain colorless transparent solution D; (5) spray-coating a conductive glass substrate with sol D; and (6) heating the spray-coated substrate on a heating table to obtain a tungsten oxide electron transport layer film. When the electron transport layer prepared by the invention is applied to a printable perovskite solar cell, an open circuit voltage of 850-891mV can be obtained. The electron transport layer prepared by the invention has the advantages of controllable thickness, simple technology, convenient process and strong repeatability, can reduce the production cost of cells, and is convenient for technical promotion.

Description

technical field [0001] The invention relates to a tungsten oxide electron transport layer, a preparation method and its application in perovskite solar cells, belonging to the technical field of inorganic nanometer materials. Background technique [0002] In just ten years from its birth in 2009 to 2019, the certified efficiency of perovskite solar cells based on organometallic halide light absorbers jumped from 3.8% to 23.7%, which has attracted widespread attention from researchers. Among them, the printable perovskite solar cell discards the hole transport materials and metal electrodes that affect the stability of the battery, selects the carbon counter electrode to replace noble metals such as Pt and Au, and uses the screen printing process to prepare the counter electrode, which greatly reduces the cost of the battery. It is one of the most promising battery devices to reduce the production cost and improve the stability of the device at the same time. [0003] Tungst...

Claims

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Application Information

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IPC IPC(8): H01L51/42H01L51/46H01L51/44H01L51/48
CPCH10K71/12H10K30/10H10K30/80H10K2102/00Y02E10/549Y02P70/50
Inventor 李文琴吴子华王元元刘辉刘静
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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