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Method for improving crystallinity of perovskite

A perovskite and crystalline technology, applied in the field of solar cells, can solve the problems of unsatisfactory crystalline properties of perovskite thin films, and achieve the effects of broad industrial application prospects, low energy consumption, and low energy consumption.

Inactive Publication Date: 2016-11-16
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0005] In order to solve the problem of unsatisfactory crystallization properties of perovskite thin films in the background technology, the purpose of the present invention is to provide an annealing method that can improve the crystallinity of perovskite: solvent annealing under dimethyl sulfoxide atmosphere

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  • Method for improving crystallinity of perovskite
  • Method for improving crystallinity of perovskite
  • Method for improving crystallinity of perovskite

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with accompanying drawing and example.

[0020] The glass substrate covered with ITO was ultrasonically washed with detergent, acetone, and ethanol for 30 minutes, and dried with a nitrogen gun. Preparation of CH3NH3PbI with a thickness of 300nm by spin coating 3-x Cl x Perovskite light absorbing layer. Heat at 100°C for 5 minutes. The pre-annealed samples were transferred to a heating stage at 100°C. Place a crucible with a diameter of 1 cm on the heating stage, use a pipette gun to draw 10 μl of dimethyl sulfoxide dropwise into the crucible, and then quickly cover the sample and the crucible with a glass cover. The crucible is heated, and the solvent inside turns into steam and evaporates, forming a dimethyl sulfoxide solvent atmosphere in the lid. The solvent annealing time was 30min. Such as figure 1 shown.

[0021] The principle of annealing under dimethyl sulfoxide solvent atmosphere is a...

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Abstract

The invention discloses a method for improving crystallinity of perovskite. According to the method for improving crystallinity of perovskite, annealing is carried out under a dimethyl sulfoxide solvent atmosphere in the preparation process of perovskite; and in the annealing process, a perovskite sample is put in the dimethyl sulfoxide atmosphere to promote grain growth so as to generate a perovskite thin film with excellent thin film crystallinity and low defect density. By adoption of the thin film, the carrier recombination of a perovskite solar cell can be reduced, and the performance of the perovskite solar cell can be improved; and compared with the commonly-used vapor, dimethyl formamide and other solvent used in annealing, the dimethyl sulfoxide has lower vapor pressure and higher boiling point, so that the dimethyl sulfoxide has higher advantage in improving the crystallinity of the perovskite.

Description

technical field [0001] The invention relates to a solar cell based on an organic-inorganic hybrid perovskite material, in particular to an annealing method for improving the crystallinity of the perovskite. Background technique [0002] Solar photovoltaic technology is an important part of green energy. Among the current types of solar cells, perovskite solar cells have attracted many scientific researches due to their high absorbency, high carrier mobility, low cost, and simple process. The concern of personnel, and is considered to be a new type of photovoltaic cell with great development prospects. At present, the conversion efficiency of perovskite photovoltaic cells has reached more than 20%, which has reached the same level as commercial silicon cells. [0003] At present, perovskite materials are mainly prepared by one-step spin coating method, two-step method, and co-evaporation method. However, these preparation methods are difficult to prepare highly crystalline ...

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Application Information

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IPC IPC(8): H01L21/324
CPCH01L21/324
Inventor 郭小伟柳邦周勇李绍荣
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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