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Light absorption material constructed by A and X site coordinated regulation as well as preparation method and application thereof

A light-absorbing material, cubic phase technology, applied in the preparation of organic compounds, the preparation of amino compounds, chemical instruments and methods, etc., can solve the problems of structural phase transition, ion migration, poor stability, etc., and achieve high photoelectric conversion efficiency and large applications. Value, good thermal stability

Active Publication Date: 2021-11-26
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the methylamine lead iodide perovskite is a tetragonal phase at room temperature, and the phase transition from the tetragonal phase to the cubic phase occurs above 56 ° C, but the ABX represented by methylamine lead iodine 3 Type organic-inorganic hybrid perovskites have poor intrinsic stability, and are prone to ion migration and structural phase transitions within the material due to the influence of light and temperature; the interaction with water / oxygen can easily degrade the material, which limits the service life of the device

Method used

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  • Light absorption material constructed by A and X site coordinated regulation as well as preparation method and application thereof
  • Light absorption material constructed by A and X site coordinated regulation as well as preparation method and application thereof
  • Light absorption material constructed by A and X site coordinated regulation as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) PbI 2 (0.70~0.90mmol), Pb(SCN) 2 (0.10~0.30mmol), CH 3 NH 3 I (0.70~0.95mmol) and (CH 3 ) 2 NH 2 I (0.05-0.30 mmol) was dissolved in a mixed solvent of dimethyl sulfoxide and pyrrolidone (volume ratio 8:1) to obtain a yellow transparent solution (ie, the precursor solution);

[0039] (2) Coating the precursor solution to form a film by a liquid phase method, and then performing surface treatment with 0.5-2.0 mL cyclohexane solution to obtain a precursor film;

[0040] (3) Place the precursor thin film in a nitrogen atmosphere, and perform annealing treatment (crystallization) on a hot stage at 70-110° C. for 0.5 hours to obtain a perovskite thin film (light-absorbing layer). The chemical formula of the gained light absorbing layer is (CH 3 NH 3 ) 0.70～0.95 ((CH 3 ) 2 NH 2 ) 0.30～ 0.05 PB 2.40～2.80 SCN 0.60～0.20 , with a thickness of about 500 nm.

[0041] Carry out X-ray diffraction test with the obtained perovskite thin film of present embodiment 1...

Embodiment 2

[0046] (1) PbI 2 (1.0mmol), CH 3 NH 3 I (0.70~0.90mmol), CH 3 NH 3 BF 4 (0.05~0.15mmol) and (CH 3 ) 2 NH 2 I (0.05~0.15mmol) and ionic liquid (0.02~0.05mmol) were dissolved in a mixed solvent of dimethyl sulfoxide and N,N-dimethylformamide (10:1) to obtain a yellow transparent solution;

[0047] (2) Coating the yellow transparent solution into a film by liquid phase to obtain a precursor film;

[0048] (3) Place the obtained precursor thin film directly on a hot stage at 70-110° C. for 0.5 hour annealing treatment in a nitrogen atmosphere to obtain a cubic phase perovskite thin film. The chemical formula of the gained light absorbing layer is (CH 3 NH 3 ) 0.85～0.95 ((CH 3 ) 2 NH 2 ) 0.15～ 0.05 PB 2.85～2.95 (BF 4 ) 0.15～0.05 , with a thickness of about 600nm.

[0049] Refer to Example 1 for the material selection and preparation process of other layers of the solar cell in Example 2. The photoelectric conversion efficiency of the solar cell obtained reaches ...

Embodiment 3

[0051] (1) PbI 2 (1.0mmol), CH 3 NH 3 I (0.60~0.80mmol), CH 3 NH 3 BF 4 (0.10~0.20mmol) and (CH 3 CH 2 )NH 3 I (0.10~0.20mmol) was dissolved in a mixed solvent of dimethyl sulfoxide and N,N-dimethylformamide (5:1) to obtain a yellow transparent solution;

[0052] (2) Coating the yellow transparent solution into a film through the liquid phase, and placing it in methylamine vapor for 10 minutes to obtain a precursor film;

[0053](3) Place the obtained precursor thin film directly on a hot stage at 70-110°C in dry air for 0.5 hour annealing treatment to obtain a cubic phase perovskite thin film. The chemical formula of the gained light absorbing layer is (CH 3 NH 3 ) 0.80～0.90 (CH 3 CH 2 NH 3 ) 0.20～ 0.10 PB 2.80～2.90 (BF 4 ) 0.20～0.10 , with a thickness of about 700nm.

[0054] The solar cell structure in this embodiment 3 is FTO conductive glass substrate / SnO 2 / Perovskite / spiro-MeOTAD / Au. where SnO 2 Prepared by atomic layer deposition process, the thi...

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Abstract

The invention relates to a light absorption material constructed by A and X site coordinated regulation as well as a preparation method and application thereof. The light absorption material is halogen perovskite with a cubic phase structure, and the chemical formula of the light absorption material is AyA '1-yBXzX' 3-z, wherein A is CH3NH < 3 + >, A'is at least one of (NH2) 2CH < + >, (CH3) 2NH2 < + >, (CH3) 3NH < + >, (CH3CH2) NH3 < + > and (CH3CH2) 2NH2 < + >, B is at least one of Sn < 2 + >, Sr < 2 + > and Ca < 2 + > and Pb < 2 + > or Pb < 2 + >, X is I-, X'is at least one of SCN <->, BF4 <->, HCOO <-> and CN <->, y is larger than or equal to 0.7 and smaller than 1.0, and z is larger than or equal to 2.5 and is smaller than 3.0.

Description

technical field [0001] The invention relates to a light-absorbing material with a perovskite structure constructed by coordinated regulation of the A and X positions and its preparation method and application. The stable cubic phase perovskite structure is used to realize the unity of high efficiency and high stability of perovskite solar cells. It belongs to the field of solar cell energy. Background technique [0002] With the increasingly severe global energy and environmental problems, China has upgraded the new energy industry, including solar energy, to a national strategic industry. Solar photovoltaic technology uses the principle of photovoltaics to convert abundant solar energy into electrical energy, and has become one of the most potential ways to solve the energy crisis of mankind. Metal halide perovskites have become a class of photovoltaic materials with great application prospects due to their excellent light absorption and carrier transport properties, abund...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C211/04C07C211/05C07C211/09C07C209/00C09K3/00H01L51/42H01L51/46
CPCC07C211/04C07C211/05C07C211/09C07C209/00C09K3/00H10K85/20H10K30/10Y02E10/549
Inventor 黄富强秦鹏邵峰张国庆
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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