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Alpha-FAPbI3 powder, preparation method thereof and perovskite solar cell

A solar cell and perovskite technology, which is applied in semiconductor/solid-state device manufacturing, circuits, photovoltaic power generation, etc., can solve problems such as methods to be improved, unfavorable for amplification, and long precipitation time, so as to solve the problem of irreproducible photovoltaic performance, Conducive to large-scale production and application, the effect of reducing production costs

Pending Publication Date: 2021-07-23
WUXI UTMOST LIGHT TECH CO LTD
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  • Claims
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AI Technical Summary

Problems solved by technology

Preparation of α-FAPbI as described above 3 The method has the following disadvantages: (1) heating in an oil bath is used, and the reaction conditions are relatively severe; (2) it takes a long time to precipitate using the retrograde method, and only the saturated part is separated out to cause α-FAPbI 3 The productive rate is lower; (3) the raw material purity requirement used is high, and this method is unfavorable for amplifying in practice, is difficult to produce in large quantities; (4) use above-mentioned method to prepare α-FAPbI 3 Unstable in the air, it will change from black α phase to yellow δ phase after a period of time
[0004] Therefore, the existing preparation of α-FAPbI 3 The method of powder needs to be improved

Method used

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  • Alpha-FAPbI3 powder, preparation method thereof and perovskite solar cell

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preparation example Construction

[0033] Preparation of α-FAPbI according to an embodiment of the present invention 3 The powder method obtains a mixed solution by mixing lead iodide, formamidine iodide and a solvent, wherein lead iodide and formamidine iodide can be synthesized in a laboratory, avoiding the use of high-purity reaction raw materials, thereby reducing costs, After normal temperature anti-solvent precipitation and solid-liquid separation, the FAPbI 3 Crystals are precipitated from the solution and a filter cake is obtained, thereby increasing the yield. Finally, the filter cake is heated at a temperature range of 110-150°C to prepare α-FAPbI 3 powder. Thus, adopt the preparation α-FAPbI of the present application 3 The powder method has the following advantages: (1) avoids the use of high-purity reaction raw materials, thereby reducing costs; (2) adopts antisolvent to separate out FAPbI at room temperature 3 Crystal, mild reaction conditions; (3) avoiding the use of a large amount of toxic so...

Embodiment 1

[0041] (1) Weigh 2.11g of iodoformamidine synthesized in the laboratory and 5.67g of lead iodide synthesized in the laboratory, then add 10mL of γ-butyrolactone in a 100mL single-necked flask to prepare 1.23mol / L of FAPbI 3 Precursor solution, place the flask in an ultrasonic cleaner and sonicate until the raw materials are completely dissolved and the solution turns into a bright yellow clear liquid;

[0042] (2) Put the rotor in the flask, stir vigorously on the magnetic stirrer, and slowly add 30mL of ethyl acetate to the flask, observe the formation of yellow powder precipitation, then filter the above solution to obtain yellow FAPbI 3 filter cake;

[0043] (3) Transfer the filter cake to an evaporating dish and put it on a heating plate for drying. When the temperature of the heating plate is 90°C, dry bright yellow δ-FAPbI can be obtained 3 Powder, dried at 150°C for a period of time to obtain dry bright black α-FAPbI 3 powder;

[0044] (4) Treatment of α-FAPbI in an ...

Embodiment 2

[0046] (1) Weigh 2.58g of iodoformamidine synthesized in the laboratory and 6.92g of lead iodide synthesized in the laboratory, then add 10mL of 2-methoxyethanol to a 100mL single-necked flask to prepare 1.5mol / L of FAPbI 3 Precursor solution, place the flask in an ultrasonic cleaner and sonicate until the raw materials are completely dissolved and the solution turns into a bright yellow clear liquid;

[0047] (2) Put the rotor in the flask, stir vigorously on a magnetic stirrer, and slowly add 50mL of ether to the flask, observe the formation of yellow powder precipitation, then filter the above solution to obtain yellow FAPbI 3 filter cake;

[0048] (3) Transfer the filter cake to an evaporating dish and put it on a heating plate for drying. When the temperature of the heating plate is 85° C., dry bright yellow δ-FAPbI can be obtained 3 Powder, dried at 150°C for a period of time to obtain dry bright black α-FAPbI 3 powder;

[0049] (4) Contains NH at 100°C 4 Treatment o...

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Abstract

The invention discloses alpha-FAPbI3 powder, a preparation method thereof and a perovskite solar cell. The method for preparing the alpha-FAPbI3 powder comprises the steps: (1) mixing lead iodide, iodoformamidine and a solvent to obtain a mixed solution; (2) mixing the mixed solution with an anti-solvent, and carrying out solid-liquid separation to obtain a filter cake; and (3) heating the filter cake at the temperature of 110 DEG C to 150 DEG C to obtain the alpha-FAPbI3 powder. Therefore, according to the preparation method, high-purity reaction raw materials are not used, so that the cost is reduced; FAPbI3 crystals are separated out by adopting an anti-solvent at room temperature, and the reaction conditions are mild; use of a lot of toxic solvents is avoided, and the method is suitable for green and safe production; and moreover, the yield of the alpha-FAPbI3 powder is improved. Therefore, when the alpha-FAPbI3 powder obtained by the method is used for preparing the perovskite cell, the production cost can be reduced, the problem that the photovoltaic performance of the perovskite cell in the prior art is not repeatable can be solved, and large-scale production and application are facilitated.

Description

technical field [0001] The invention belongs to the field of perovskite solar cells, in particular to an α-FAPbI 3 Powder and method for its preparation and perovskite solar cell. Background technique [0002] With the development of photovoltaic technology, optoelectronic materials have been continuously developed by researchers to improve the efficiency of battery devices. At present, more researches are perovskite solar cells and organic solar cells. Organic-inorganic hybrid all-solid-state perovskite solar cells (PSCs) are currently attracting more and more researchers' attention due to their low cost and high performance. where FAPbI 3 It is currently one of the most promising perovskite materials for high-efficiency solar cells, with an optimal bandgap of 1.47eV and a high absorption coefficient of over 104cm -1 , the carrier diffusion length is several hundred micrometers. The photoelectric conversion efficiency of perovskite solar cells reported so far exceeds 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C257/12C01G21/16H01L51/42
CPCC07C257/12C01G21/16H10K85/00H10K30/00Y02E10/549Y02P70/50
Inventor 樊新召李佳锋
Owner WUXI UTMOST LIGHT TECH CO LTD
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