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Perovskite solar cell and preparation method thereof

A solar cell and perovskite technology, applied in the field of solar cells, can solve the problems of weak humidity resistance and poor humidity stability, and achieve the effects of high humidity stability, easy control, and high photoelectric conversion efficiency

Inactive Publication Date: 2016-03-09
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the weak moisture resistance of the perovskite type formamidine lead iodide prepared by the prior art, and the shortcoming of poor humidity stability, and propose a kind of humidity resistance that utilizes cesium ions to improve the moisture resistance of formamidine lead iodide Stable perovskite solar cells

Method used

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  • Perovskite solar cell and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Use FTO conductive glass as the substrate 1; dilute titanium isopropoxide coordinated with acetylacetone 10 times with ethanol, take 1.2mL of the diluted solution and divide it into three times on average, and under the condition of the substrate temperature of 450°C, use oxygen as The carrier is subjected to spray pyrolysis to obtain a dense titanium dioxide layer 2 .

[0028] Dilute the titanium dioxide slurry (18NRT, Dyesol) and ethanol according to the mass ratio of 1:6 and mix them evenly. Take 50 μL of the diluted titanium dioxide slurry, set the speed of the homogenizer at 5000r / min for 30s, and then spin-coat the obtained The film was dried and sintered at temperatures of 80°C, 125°C, 350°C and 500°C in sequence, and the duration of each temperature was 30 minutes; non-titanium dioxide substances in the film were removed to obtain a porous titanium dioxide layer 3 composed of titanium dioxide nanoparticles.

[0029] Drop 50 μL of the dimethylformamide mixed solu...

Embodiment 2

[0034] The difference between Example 2 and Example 1 is that when preparing the perovskite-type light-absorbing layer material, a dimethylformamide solution with a concentration of 462 mg / mL of lead iodide and 52 mg / mL of cesium iodide is used, Then doped formamidine lead iodide was prepared to assemble perovskite solar cells.

[0035] After testing, the photoelectric conversion efficiency of the perovskite solar cell prepared by doping formamidine lead iodide with this concentration of cesium ions reaches 12.4%. After using a constant temperature and humidity box to age this device, the aging conditions are 50% humidity and 20°C. After 100 hours, the photoelectric conversion efficiency of the solar cell remains at about 4.8%, and the humidity stability is stronger than that of undoped calcium titanium. Mine solar cells.

Embodiment 3

[0037] The difference between Example 3 and Example 1 and Example 2 is: when preparing the perovskite type light-absorbing layer material, the dimethyl formamide solution, and then prepare doped formamidine lead iodide to assemble perovskite solar cells.

[0038] After testing, the photoelectric conversion efficiency of the perovskite solar cell prepared by doping formamidine lead iodide with this concentration of cesium ions reaches 8.54%. After using a constant temperature and humidity box to age this device, the aging conditions are 50% humidity and 20°C. After 100 hours, the photoelectric conversion efficiency of the solar cell remains at about 3.4%, and the humidity stability is stronger than that of undoped calcium titanium. Mine solar cells.

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Abstract

The invention, which belongs to the technical field of the solar cell, provides a perovskite solar cell and a preparation method thereof. In order to overcome a defect of poor humidity stability of the perovskite solar cell due to poor humidity stability of the existing perovskite type formamidinium lead iodide, the invention provides a method using cesium ion doping to improve the moisture-resistant capability of the formamidinium lead iodide and enhance humidity stability of the solar cell. The prepared perovskite solar cell uses a piece of FTO conductive glass (1) as a substrate; a compact titanium dioxide layer (2), a porous titanium dioxide layer (3), a perovskite layer (4), a hole transport layer (5) and an electrode (6) are formed on the substrate successively. And the perovskite layer is made of caesium-doped formamidinium lead iodide. According to the invention, the prepared perovskite solar cell has high humidity stability and is suitable for practical application. In addition, compared with the solar cell without cesium ion doping, the prepared solar cell has high efficiency and high repeatability and is suitable for popularization and practical production.

Description

technical field [0001] The invention belongs to the technical field of solar cells. Background technique [0002] In recent years, the use of organic-inorganic hybrid halides with a perovskite structure as a light-absorbing layer to prepare solar cells has attracted widespread attention, and its photoelectric conversion efficiency has reached 20%. At present, the most commonly used perovskite-type light-absorbing layer material is methylamine lead iodide (CH 3 NH 3 PB 3 ), the light absorption range of this perovskite material is about 300-800nm. Another perovskite-type light-absorbing layer material is formamidine lead iodide (HC(NH 2 ) 2 PB 3 ), the light absorption range of this perovskite material can be extended to 850nm, and compared with methylamine lead iodide, it can utilize sunlight energy in a larger wavelength range. However, formamidine lead iodide will transform into another non-perovskite structure that cannot be used as a photovoltaic material due to t...

Claims

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Application Information

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IPC IPC(8): H01L51/42H01L51/46H01L51/48
CPCH10K71/12H10K85/30H10K30/151Y02E10/549H10K30/87H10K2102/101H10K85/50
Inventor 刘喜哲夏祥
Owner JILIN UNIV
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