Search

CN-122003005-A - Method for improving illumination stability of perovskite solar cell

CN122003005ACN 122003005 ACN122003005 ACN 122003005ACN-122003005-A

Abstract

The invention relates to a method for improving illumination stability of a perovskite solar cell, which sequentially comprises a conductive substrate layer, a first transmission layer, a three-dimensional perovskite layer, a second transmission layer and a back electrode layer from bottom to top, wherein the first transmission layer is an electron transmission layer or a hole transmission layer, the second transmission layer is a hole transmission layer or an electron transmission layer, and the upper part and the lower part of the three-dimensional perovskite layer are respectively provided with the electron transmission layer and the hole transmission layer correspondingly. The method for improving the illumination stability of the perovskite solar cell comprises the steps of preparing a lower two-dimensional perovskite layer between a first transmission layer and a three-dimensional perovskite layer, preparing an upper two-dimensional perovskite layer between the three-dimensional perovskite layer and a second transmission layer, wherein the preparation materials of the upper two-dimensional perovskite layer and the lower two-dimensional perovskite layer are respectively alkali metal chlorides, and the alkali metal chlorides are at least one of cesium chloride, potassium chloride, sodium chloride and rubidium chloride. The invention improves the illumination stability of the perovskite solar cell.

Inventors

  • Request for anonymity
  • Request for anonymity
  • Request for anonymity

Assignees

  • 杭州纤纳光电科技股份有限公司

Dates

Publication Date
20260508
Application Date
20241101

Claims (6)

  1. 1. The method for improving the illumination stability of the perovskite solar cell is characterized in that the internal structure of the perovskite solar cell sequentially comprises a conductive substrate layer, a first transmission layer, a three-dimensional perovskite layer, a second transmission layer and a back electrode layer from bottom to top, wherein the first transmission layer is an electron transmission layer or a hole transmission layer, the second transmission layer is a hole transmission layer or an electron transmission layer, and the upper part and the lower part of the three-dimensional perovskite layer are respectively provided with the electron transmission layer and the hole transmission layer correspondingly, and the method for improving the illumination stability of the perovskite solar cell is characterized in that: and preparing a lower two-dimensional perovskite layer between the first transmission layer and the three-dimensional perovskite layer, wherein the preparation material of the lower two-dimensional perovskite layer is alkali metal chloride, and the alkali metal chloride is at least one of cesium chloride, potassium chloride, sodium chloride and rubidium chloride.
  2. 2. The method for improving the illumination stability of the perovskite solar cell according to claim 1, wherein the preparation method of the lower two-dimensional perovskite layer is characterized in that alkali metal chloride is dissolved in a solvent to prepare a solution with the mass concentration of 0.5 mg/mL-4 mg/mL, the solution is coated on the surface of the first transmission layer, and then the solution is annealed for 1 minute at the temperature of 100 ℃, in the atmosphere or in the inert gas atmosphere, wherein the solvent is any one of ethanol, isopropanol, methanol and ethylene glycol formamidine, and the coating method is any one of a doctor-blading method, a spin-coating method and a spraying method.
  3. 3. The method for improving the illumination stability of the perovskite solar cell is characterized in that the internal structure of the perovskite solar cell sequentially comprises a conductive substrate layer, a first transmission layer, a three-dimensional perovskite layer, a second transmission layer and a back electrode layer from bottom to top, wherein the first transmission layer is an electron transmission layer or a hole transmission layer, the second transmission layer is a hole transmission layer or an electron transmission layer, and the upper part and the lower part of the three-dimensional perovskite layer are respectively provided with the electron transmission layer and the hole transmission layer correspondingly, and the method for improving the illumination stability of the perovskite solar cell is characterized in that: and preparing an upper two-dimensional perovskite layer between the three-dimensional perovskite layer and the second transmission layer, wherein the preparation material of the upper two-dimensional perovskite layer is alkali metal chloride, and the alkali metal chloride is at least one of cesium chloride, potassium chloride, sodium chloride and rubidium chloride.
  4. 4. The method for improving the illumination stability of the perovskite solar cell according to claim 3, wherein the preparation method of the upper two-dimensional perovskite layer is characterized in that alkali metal chloride is dissolved in a solvent to prepare a solution with the mass concentration of 0.5 mg/mL-4 mg/mL, the solution is coated on the surface of the three-dimensional perovskite layer, and then the solution is annealed for 1 minute at the temperature of 150 ℃, in the atmosphere or in the inert gas atmosphere, wherein the solvent is any one of ethanol, isopropanol, methanol and ethylene glycol formamidine, and the coating method is any one of a doctor-blading method, a spin-coating method and a spraying method.
  5. 5. The method for improving the illumination stability of the perovskite solar cell is characterized in that a lower two-dimensional perovskite layer is prepared between the first transmission layer and the three-dimensional perovskite layer, an upper two-dimensional perovskite layer is prepared between the three-dimensional perovskite layer and the second transmission layer, the preparation materials of the upper two-dimensional perovskite layer and the lower two-dimensional perovskite layer are respectively alkali metal chlorides, and the alkali metal chlorides are at least one of cesium chloride, potassium chloride, sodium chloride and rubidium chloride.
  6. 6. The method for improving the illumination stability of the perovskite solar cell according to claim 5, wherein the preparation method of the lower two-dimensional perovskite layer is characterized in that alkali metal chloride is dissolved in a solvent to prepare a solution with the mass concentration of 0.5 mg/mL-4 mg/mL, the solution is coated on the surface of the first transmission layer, and then the solution is annealed for 1 minute at the temperature of 100 ℃, in the atmosphere or in the inert gas atmosphere, wherein the solvent is any one of ethanol, isopropanol, methanol and ethylene glycol formamidine, and the coating method is any one of a doctor-blading method, a spin-coating method and a spraying method; The preparation method of the upper two-dimensional perovskite layer comprises the steps of dissolving alkali metal chloride in a solvent to prepare a solution with the mass concentration of 0.5-4 mg/mL, coating the solution on the surface of the three-dimensional perovskite layer, and annealing for 1 minute at the temperature of 150 ℃ in the atmosphere or in the inert gas atmosphere, wherein the solvent is any one of ethanol, isopropanol, methanol and ethylene glycol formamidine, and the coating method is any one of a knife coating method, a spin coating method and a spraying method.

Description

Method for improving illumination stability of perovskite solar cell Technical Field The invention belongs to the technical field of perovskite solar cell preparation, and particularly relates to a method for improving illumination stability of a perovskite solar cell. Background An important challenge faced by current perovskite solar cells is the light stability. The formation of a two-dimensional perovskite structure through interface modification is an important method for improving the stability of perovskite, however, at present, organic alkylamines are generally adopted to modify perovskite with a three-dimensional structure to form a two-dimensional/three-dimensional perovskite structure so as to improve the stability of perovskite. This method can only be applied to the treatment of the upper surface of perovskite, and cannot form a two-dimensional structure on the lower surface. Meanwhile, because the organic material is introduced, the ultraviolet stability is poor, so that the illumination stability of the device is difficult to be improved substantially. Studies have shown that two-dimensional (2D) perovskite structures have excellent photo-wet-thermal stability relative to three-dimensional (3D) perovskite structures. However, the perovskite film layer with a simple 2D structure has larger resistance and low carrier mobility, and the device using 2D perovskite as an absorption layer has relatively low efficiency, so that the commercial requirement can not be met. In view of this, an important method for achieving both efficiency and stability of perovskite solar cells is to prepare a layer of halide film containing long-chain alkylamine on the surface of 3D perovskite, rebuild the surface of 3D perovskite into 2D perovskite by means of cation exchange on the surface of 3D perovskite, form 2D/3D perovskite structure, and use photo-wet-thermal stability of 2D perovskite as a protective layer of 3D perovskite. The 2D structure formed on the surface of the 3D perovskite is very thin, so that the efficiency of the device is not affected, and meanwhile, the photo-wet-thermal stability of the 2D structure of the thin layer can prevent external water and oxygen from eroding into the bottom perovskite, so that the purpose of improving the stability of the device is achieved. However, there are two problems associated with current techniques. On one hand, due to the problem of mutual dissolution, the 2D structure can only be applied to the upper surface of the 3D perovskite, and the 2D structure can not be formed on the lower surface of the perovskite, which greatly limits the further improvement of the stability of the device. On the other hand, the stability of the device is improved by adopting a 2D structure, namely, a layer of organic amine substances is prepared on the surface of the 3D perovskite, and the 2D perovskite formed in the way is still of an organic-inorganic hybridization perovskite structure. Due to the presence of organic structures, the stability to uv light is still poor, and thus it is difficult to essentially solve the light stability of the device. Because the inorganic material has more excellent ultraviolet stability than the organic material, if the inorganic 2D structure can be prepared to be used as a protective layer of the 3D perovskite, the stability of the device can be well improved. In view of the above analysis, in combination with the stability of the perovskite of the 2D structure and the special stability of the inorganic material, it is possible to develop an inorganic 2D perovskite structure that can be applied to both the upper surface and the lower surface, and thus it is possible to enhance the stability of the perovskite. Disclosure of Invention The technical problem to be solved by the invention is to provide the method for improving the illumination stability of the perovskite solar cell, wherein the two-dimensional perovskite layer is arranged on and/or below the three-dimensional perovskite layer of the perovskite solar cell, the inorganic alkali chloride is used as a raw material for forming the two-dimensional perovskite, and the inorganic alkali chloride reacts with the three-dimensional perovskite to form a stable two-dimensional structure, so that the illumination stability of the perovskite solar cell is greatly improved. The traditional 2D perovskite is of an organic-inorganic hybrid structure, and still faces the problem that an organic structural unit is decomposed under the ultraviolet light condition, and the ultraviolet instability problem of the organic 2D perovskite structure can be solved by using the inorganic 2D perovskite structure. The invention utilizes the inorganic 2D perovskite structure to be applied to the 3D perovskite structure to form a 2D/3D perovskite structure, thereby greatly improving the ultraviolet stability of the current perovskite solar cell. The invention is realized in such a way, and provides a method for improvin