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Inorganic lead-free double perovskite thin film, solar cell and preparation method thereof

A lead-free double perovskite and double perovskite technology, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of battery device performance degradation, incompleteness, composition deviation, etc., and achieve good photoluminescence response, The effect of high crystallinity

Pending Publication Date: 2021-02-05
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide an inorganic lead-free double perovskite film, a solar cell and a preparation method thereof, aiming at solving the problem of Cs prepared by the existing one-step spin coating method. 2 AgBr 6 The problem of uneven film and incomplete reaction of the two-step spin coating method, while avoiding the problem of composition deviation caused by the dual-source thermal evaporation method, which leads to the degradation of the performance of the battery device

Method used

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  • Inorganic lead-free double perovskite thin film, solar cell and preparation method thereof
  • Inorganic lead-free double perovskite thin film, solar cell and preparation method thereof
  • Inorganic lead-free double perovskite thin film, solar cell and preparation method thereof

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Embodiment 1

[0051] In this example, FTO glass was used as the substrate, and double perovskite Cs with smooth, dense, high crystallinity, good photoluminescence response and ideal stoichiometric ratio was prepared by vacuum single-source thermal evaporation method. 2 AgBr 6 film.

[0052] The synthesized Cs 2 AgBr 6 powder into the figure 2 Cs is directly heated in the vacuum single-source thermal evaporation device shown 2 AgBr 6 powder, the powder is vaporized and deposited directly on the FTO glass substrate to form Cs 2 AgBr 6 film. Its specific preparation process is as follows:

[0053] First, clean the FTO glass substrate and weigh 0.40g Cs 2 AgBr 6 powder, put the powder into the evaporation boat, the distance between the substrate and the evaporation source is 25cm, and vacuumize the reaction chamber until the vacuum degree reaches 5.0×10 -4 After Pa, heat the substrate to 100°C, adjust the substrate speed to 20r / min, then turn on the evaporation power supply, gradual...

Embodiment 2

[0059] In this embodiment, the double perovskite thin-film solar cell adopts a flat solar cell structure such as: FTO / cl-TiO 2 / Cs 2 AgBr 6 / Spiro-OMeTAD / Ag, the FTO glass was cleaned first, and the dense TiO 2 Spin-coat on the FTO glass substrate (3000r / 30s), put it in a muffle furnace for sintering at 450°C for 1 hour, cool down to room temperature for later use; 2 The substrate of the film is transferred to the reaction chamber of the vacuum single-source thermal evaporation device, adopting the same Cs as in Example 1 2 AgBr 6 Thin film preparation method on dense TiO 2 Preparation of Cs on film 2 AgBr 6 film; then in Cs 2 AgBr 6 Spiro-OMeTAD (3000r / 30s) was spin-coated on the film, and finally the Ag electrode was evaporated to form a device structure of FTO / cl-TiO 2 / Cs 2 AgBr 6 / Spiro-OMeTAD / Ag solar cells. The performance of the solar cell prepared in this embodiment is as follows:

[0060] 1. Under AM1.5 simulated sunlight conditions, the double perovskit...

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Abstract

The invention discloses an inorganic lead-free double perovskite thin film, a solar cell and a preparation method of the solar cell. The preparation method of the inorganic lead-free double perovskitethin film comprises the following steps: synthesizing double perovskite Cs2AgBiBr6 crystal powder; putting the double perovskite Cs2AgBiBr6 crystal powder into an evaporation boat of a reaction chamber, vacuumizing the reaction chamber, heating a substrate to a preset temperature, heating the double perovskite Cs2AgBiBr6 crystal powder until the double perovskite Cs2AgBiBr6 crystal powder is evaporated, and preliminarily forming an initial Cs2AgBiBr6 film on the substrate; and transferring the initial Cs2AgBiBr6 thin film into a nitrogen glove box, and placing the nitrogen glove box on a heating plate for annealing treatment to finally obtain the inorganic lead-free double perovskite thin film. The inorganic lead-free double perovskite thin film which is flat, compact, high in crystallinity and good in photoluminescence response and accords with an ideal stoichiometric ratio is prepared by adopting a vacuum single-source thermal evaporation method.

Description

technical field [0001] The invention relates to the field of perovskite thin film solar cells, in particular to an inorganic lead-free double perovskite thin film, a solar cell and a preparation method thereof. Background technique [0002] The chemical formula of traditional perovskite materials can be expressed as APbX 3 , where A represents the ammonium ion (CH 3 NH 3 + ,(NH 2 ) 2 CH + ), X represents a halide ion (Cl - , Br - , I - ). Although the conversion efficiency of traditional perovskite solar cells has reached more than 25%, which is comparable to that of silicon solar cells, two major problems still need to be solved in order to realize large-scale commercialization of traditional perovskite solar cells, namely, lead toxicity and stability. sex. At present, high-efficiency perovskite batteries generally contain the toxic element lead (Pb). Large-scale use of Pb will cause great harm to the environment and human health; on the other hand, traditional p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L21/02H01L51/42H01L51/46H01L51/48
CPCH01L21/02521H01L21/02631H01L21/02694H10K30/151H10K30/10H10K2102/00Y02E10/549Y02P70/50
Inventor 范平彭欢信梁广兴郑壮豪
Owner SHENZHEN UNIV
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