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Lead-free perovskite film, and preparation method and application thereof

A lead-free perovskite and thin film technology, which is applied in the field of solar cells, can solve the problems of unfavorable industrialization development and low coverage of perovskite thin films, and achieve the effects of facilitating large-scale production, environmental protection, and smooth thin films

Inactive Publication Date: 2016-06-15
HEBEI UNIVERSITY
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Problems solved by technology

[0005] The second object of the present invention is to provide a method for preparing a lead-free perovskite film. The method adopts organic-inorganic alternating co-evaporation to prepare a lead-free perovskite film, which can solve the problem of the existing liquid-phase one-step method. The low coverage of perovskite films and the problems that are not conducive to the development of industrialization

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  • Lead-free perovskite film, and preparation method and application thereof
  • Lead-free perovskite film, and preparation method and application thereof
  • Lead-free perovskite film, and preparation method and application thereof

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Embodiment Construction

[0027] The general chemical formula of the lead-free perovskite film provided by the present invention is CH 3 NH 3 wxya 3 ; Wherein, X is Cl, Br or I. The preparation method of the lead-free perovskite film is as follows:

[0028] a. Weigh SnX 2 Powder and CH 3 NH 3 X powder, X is Cl, Br or I.

[0029] b. The weighed SnX 2 and CH 3 NH 3 X is placed in the chamber of the co-evaporation equipment as two evaporation sources, and the substrate (or substrate, base) is placed in the chamber of the co-evaporation equipment at the same time; the co-evaporation equipment can be a multi-source co-evaporation equipment.

[0030] c. Vacuum the chamber of the co-evaporation equipment; generally, it can be vacuumed to 5×10 -5 Pa~30×10 -5 Pa.

[0031] d. First, the evaporation source SnX 2 is heated so that the SnX 2 Evaporated and deposited on the substrate; then stop the evaporation source SnX 2 heating, and then the evaporation source CH 3 NH 3 X is heated so that CH 3 ...

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Abstract

The invention provides a lead-free perovskite film and a preparation method and an application thereof. The preparation method of the lead-free perovskite film comprises the steps of: weighing SnX2 and CH3NH3X as two evaporator sources, wherein the X is C1, Br or I; putting the two evaporator sources and a substrate into a cavity of a coevaporation device, and vacuumizing the cavity; heating SnX2 so as to enable SnX2 to evaporate and be deposited on the substrate; stopping heating SnX2, heating CH3NH3X so as to enable CH3NH3X to evaporate and be deposited on the substrate, and accomplishing a circulation of the alternate evaporation of SnX2 and CH3NH3X; accomplishing a second circulation of the alternate evaporation of SnX2 and CH3NH3X; and finally, taking the substrate out and performing an annealing process. According to the invention, the perovskite film is prepared by the organic and inorganic alternate coevaporation method, the film with high quality is obtained, the problem of lead pollution is solved, and the industrial development is realized.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a lead-free perovskite film, its preparation method and application. Background technique [0002] Solar cells can directly convert solar energy into electrical energy. Since solar energy is an inexhaustible clean energy source, solar cells are an important countermeasure for human beings to cope with the energy crisis and seek sustainable development. Currently, crystalline silicon solar cells account for 89% of the photovoltaic market share. However, expensive raw materials and cumbersome cell processes limit the long-term development of crystalline silicon solar cells. In the past decade, thin-film solar cells include silicon-based thin-film, Cu(In,Ga)Se 2-x S x And CdTe batteries have also begun to achieve large-scale industrialization. As an outstanding representative of the third generation of solar cells, perovskite solar cells are a new type of all-solid-state org...

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Application Information

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IPC IPC(8): H01L51/00H01L51/42H01L51/46
CPCH10K71/164H10K85/30H10K30/151Y02E10/549
Inventor 范建东沈艳娇刘冲张星李红亮陈荣荣麦耀华
Owner HEBEI UNIVERSITY
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