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Preparation method and application of all-inorganic CsPbI3 perovskite thin film

A technology of perovskite and thin film, which is applied in the field of preparation of all-inorganic calcium CsPbI3 titanium thin film, can solve the problems of decreased photoelectric conversion efficiency, narrow film component window, and easy phase transition, etc., and achieves high photoelectric conversion efficiency and deposition Wide rate window, simple and controllable effect

Inactive Publication Date: 2021-07-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the evaporation method, due to the limitation of the evaporation method itself, CsPbI 3 The composition window of the film is very narrow (R.Kottokkaran, H.A.Gaonkar, B.Bagheri, et al.Efficient p-i-n inorganic CsPbI 3 perovskite solar cell deposited using layer-by-layer vacuum deposition[J].J.Vac.Sci.Technol.A.,2018,36(4):041201), each evaporation source interacts with each other, and the evaporation rate varies with The evaporation time is constantly changing, it is difficult to accurately control the stoichiometric ratio of the film, and the properties of the prepared film are uneven and the repeatability is poor
In addition, the dark phase CsPbI 3 It is easy to undergo phase transition at room temperature, resulting in a significant drop in its photoelectric conversion efficiency
This is the preparation of high-performance all-inorganic CsPbI 3 Thin films and their intrinsic physical and optoelectronic properties present serious challenges

Method used

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  • Preparation method and application of all-inorganic CsPbI3 perovskite thin film
  • Preparation method and application of all-inorganic CsPbI3 perovskite thin film

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preparation example Construction

[0035] An all-inorganic CsPbI 3 The preparation method of perovskite thin film comprises the following steps:

[0036]Step 1. Place the substrate, cesium iodide and lead iodide two evaporation sources in the evaporation chamber, and then vacuumize;

[0037] Step 2. Wait until the vacuum degree of the chamber reaches 10 -4 When Pa is below, the substrate temperature is set to be 25-150°C, and the evaporation rate of lead iodide and cesium iodide is adjusted so that the molar ratio of the two is 1:1-1:1.4;

[0038] Step 3. After the evaporation source rate is stable, start to deposit the film, and keep the substrate rotating at a constant speed during the deposition process;

[0039] Step 4. After the deposition in step 3 is completed, take out the substrate, and then perform the first step of annealing the substrate in an air atmosphere to obtain an oxygen-passivated black phase CsPbI 3 Perovskite thin film;

[0040] Step 5. After the annealing reaction of step 4 is complet...

Embodiment 1

[0043] A preparation method for a perovskite solar cell, comprising the following steps:

[0044] Step 1. Clean the substrate: choose FTO conductive glass as the substrate, first use deionized water to rinse the FTO conductive glass several times, then use deionized water, acetone, and ethanol as solvents for ultrasonic treatment of the rinsed substrate, and The ultrasonically treated FTO conductive glass is blown dry with nitrogen, and then treated with oxygen plasma to enhance the bonding and adhesion of the substrate material surface;

[0045] Step 2. Prepare an electron transport layer on the cleaned substrate surface. The specific process is: dissolving tetrabutyl titanate in ethanol to prepare a tetrabutyl titanate ethanol solution as the preparation of TiO 2 The precursor solution of thin film, wherein, the volume percent of tetrabutyl titanate in the precursor solution is 10%; The precursor solution is deposited on the FTO conductive glass substrate that obtains throug...

Embodiment 2

[0056] Prepare perovskite solar cells according to the preparation method of Example 1, only adjust the molar ratio of cesium iodide and lead iodide in step 3.2 to 1:0.8, 1:1, 1:1.2, 1:1.4 and 1:1.6 (Correspondingly, the lead iodide evaporation rate is , the evaporation rates of cesium iodide were 0.98, 1.23, 1.48, 1.73 and ), and the rest of the steps remain unchanged.

[0057] The efficiency distribution of the device under different molar ratios of lead iodide and cesium iodide is obtained as Figure 4 shown. It can be seen that in this embodiment, high efficiency can be obtained in the molar ratio of lead iodide to cesium iodide in the range of 1:1 to 1:1.4.

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Abstract

The invention provides a preparation method and application of an all-inorganic CsPbI3 perovskite thin film, and belongs to the field of perovskite solar cells. According to the preparation method, a vacuum evaporation mode is adopted, the full-inorganic thin film with the high thin film quality is prepared by setting the evaporation rates of two evaporation sources, depositing the thin film and performing two-step annealing treatment, introduction of any organic ions is avoided in the preparation process, and it is ensured that the final CsPbI3 thin film components are pure inorganic; and the deposition rate ratio of lead iodide to cesium iodide ranges from 1: 1 to 1: 1.4, the stoichiometric ratio does not need to be strictly controlled, the deposition rate window is wide, the operation is simple and controllable, the repeatability is high, and industrial large-scale production is facilitated.

Description

technical field [0001] The invention belongs to the field of perovskite solar cells, in particular to an all-inorganic calcium CsPbI 3 Preparation method and application of titanite thin film. Background technique [0002] In the 21st century, we are facing severe environmental challenges, such as energy shortages and environmental pollution. Solar energy is environmentally friendly, low in price and abundant in reserves. It is known as the renewable clean energy with the greatest potential to replace fossil energy in the future. Therefore, the research and development of solar cells has received increasing attention. Since the development of solar cells, it has experienced the first generation of crystalline silicon solar cells, the second generation of thin film solar cells, and the third generation of new materials and new technologies currently being researched, such as dye-sensitized cells, quantum dot cells, organic Solar cells and perovskite solar cells (Perovskites...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L21/02H01L51/42H01L51/46
CPCH01L21/02521H01L21/02631H01L21/02694H10K30/15H10K2102/00Y02E10/549Y02P70/50
Inventor 刘明侦黄清荣李发明
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA