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Full-inorganic tin-lead binary perovskite absorbing material and preparation method thereof

An absorption material, perovskite technology, applied in electrical components, final product manufacturing, sustainable manufacturing/processing, etc., can solve the problems of unstable perovskite absorption materials, inability to prepare at low temperature, etc., to inhibit iodine migration, optoelectronics Performance improvement, the effect of expanding the light absorption edge

Active Publication Date: 2021-07-16
ZHENGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems that existing perovskite absorbing materials are not stable and cannot be prepared at low temperature, the object of the present invention is to provide a kind of All-inorganic tin-lead binary perovskite light-absorbing material for high-efficiency devices and its preparation method

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  • Full-inorganic tin-lead binary perovskite absorbing material and preparation method thereof
  • Full-inorganic tin-lead binary perovskite absorbing material and preparation method thereof
  • Full-inorganic tin-lead binary perovskite absorbing material and preparation method thereof

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Embodiment 1

[0044] An all-inorganic tin-lead binary perovskite absorber material CsPb 1-x sn x I 2 The preparation method of Br, the steps are as follows:

[0045] (1) Synthesis of CsPb 1-x sn x I 2 Br precursor solution: CsI:PbI 2 : PbBr 2 : SnI 2 : SnBr 2 :SnF 2 Dissolve in dimethyl sulfoxide (DMSO) and N,N- In an organic mixed solvent composed of dimethylformamide (DMF) with a volume ratio of 7:3, the reaction was stirred at room temperature for 12 h to obtain CsPb 1-x sn x I 2 Br precursor solution;

[0046] (2) Preparation of CsPb 1-x sn x I 2 Br film: filter the CsPb obtained in step (1) using a 0.22 μm microporous polytetrafluoroethylene filter 1-x sn x I 2 Br precursor solution, the precursor solution was coated by the spin method, and the perovskite layer was deposited on the substrate: spin coating at 1000 rpm for 10 s and 3000 rpm for 30 s in a nitrogen glove box, respectively, and in In the last 5 s of the second step of spin coating, 100 μL of ethyl acetat...

Embodiment 2

[0068] An all-inorganic tin-lead binary perovskite absorber material CsPb 0.55 sn 0.45 I 2 The preparation method of Br-CsCl, the steps are as follows:

[0069] (1) Synthesis of CsPb 0.55 sn 0.45 I 2 Br-CsCl precursor solution: CsI:PbI 2 : PbBr 2 : SnI 2 : SnBr 2 :SnF 2 According to the molar ratio of 2: 0.55: 0.55: 0.45: 0.45: 0.1, dissolve in the organic mixed solvent composed of dimethyl sulfoxide (DMSO) and N,N-dimethylformamide (DMF) with a volume ratio of 7:3 , Stir the reaction at room temperature for 12 h; then add cesium chloride (CsCl) to the above solution, the amount of cesium chloride CsCl added is CsI, PbI 2 , PbBr 2 , SnI 2 , SnBr 2 , SnF 2 1 wt% of the total mass, stirred for 2 h, and finally got CsPb 0.55 sn 0.45 I 2 Br-CsCl precursor solution;

[0070] (2) Preparation of CsPb 0.55 sn 0.45 I 2 Br-CsCl thin film: use a 0.22 μm microporous polytetrafluoroethylene filter to filter the CsPb obtained in step (1) 1-x sn x I 2 Br-CsCl precurso...

Embodiment 3

[0074] An all-inorganic tin-lead binary perovskite absorber material CsPb 0.55 sn 0.45 I 2 The preparation method of Br-CsCl-S, the steps are as follows:

[0075] (1) Synthesis of CsPb 0.55 sn 0.45 I 2 Br-CsCl precursor solution: CsI:PbI 2 : PbBr 2 : SnI 2 : SnBr 2 :SnF 2 According to the molar ratio of 2: 0.55: 0.55: 0.45: 0.45: 0.1, dissolve in the organic mixed solvent composed of dimethyl sulfoxide (DMSO) and N,N-dimethylformamide (DMF) with a volume ratio of 7:3 , Stir the reaction at room temperature for 12 h; then add cesium chloride (CsCl) to the above solution, the amount of cesium chloride CsCl added is the above CsI, PbI 2 , PbBr 2 , SnI 2 , SnBr 2 , SnF 2 1 wt% of the mass, stirred for 2 h, and finally got CsPb 0.55 sn 0.45 I 2 Br-CsCl precursor solution;

[0076] (2) Preparation of CsPb 0.55 sn 0.45 I 2 Br-CsCl thin film: use a 0.22 μm microporous polytetrafluoroethylene filter to filter the CsPb obtained in step (1) 1-x sn x I 2Br-CsCl pre...

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Abstract

The invention belongs to the technical field of perovskite absorbing materials, and discloses a full-inorganic tin-lead binary perovskite absorbing material and a preparation method thereof. The molecular formula of the compound is CsPb1-xSnxI2Br, CsPb1-xSnxI2Br-CsCl or CsPb1-xSnxI2Br-CsCl-S, wherein x is greater than 0 and less than 1. The preparation method comprises the following steps: (1) synthesizing a CsPb1-xSnxI2Br precursor solution: dissolving CsI, PbI2, PbBr2, SnI2, SnBr2 and SnF2 into an organic mixed solvent according to a molar ratio of 2: (1-x): (1-x): x: x: 0.1, and stirring and reacting at room temperature for 10-12 hours to obtain the CsPb1-xSnxI2Br precursor solution; and (2) preparing the CsPb1-xSnxI2Br film: filtering the CsPb1-xSnxI2Br precursor solution obtained in the step (1), depositing the CsPb1-xSnxI2Br precursor solution on a substrate through a solution deposition technology in an inert atmosphere, dropwise adding ethyl acetate within 5-10 seconds of final deposition, and then annealing the substrate with the deposited film at the temperature of more than or equal to 60 DEG C for more than or equal to 40 seconds to obtain the CsPb1-xSnxI2Br film. The high-quality thin film is obtained through a simple process; and the energy bands of the materials are better matched by regulating and controlling the proportion of tin-lead alloy elements, and the light absorption edge of the perovskite thin film is expanded.

Description

technical field [0001] The invention belongs to the technical field of perovskite absorbing materials, and in particular relates to an all-inorganic tin-lead binary perovskite absorbing material and a preparation method thereof. Background technique [0002] Since the 21st century, due to the needs of industrial development and the surge of population pressure, a serious greenhouse effect has been formed, leading to a series of serious problems such as global warming. Therefore, human beings urgently need a new type of energy with high efficiency and low pollution for current and future use. needs. In recent years, perovskite solar cells have attracted widespread attention due to their excellent photoelectric conversion performance and low-cost solution processing, and are considered to be an outstanding representative of the new generation of thin-film solar cell technology. At present, the photoelectric conversion efficiency of perovskite solar cells has rapidly increased...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0264H01L31/032H01L31/18
CPCH01L31/0264H01L31/0324H01L31/18Y02P70/50
Inventor 张懿强陈刚树宋延林李鹏伟马家乐金泽雷诺郭峰吴振华
Owner ZHENGZHOU UNIV