Preparation method of flexible iodide film

Abstract

The invention provides a preparation method of a flexible iodide film. The preparation method comprises the following steps: 1) iodide powder is dried in a vacuum drying oven to remove adsorption moisture; 2) the dried iodide powder is put into a steel mould to be pressed into a compact circular blocky evaporation source by a hydraulic press; 3) the cleaned flexible plastic film is installed on arigid support substrate; and 4) the evaporation source is placed in a round graphite crucible in the vacuum cavity, a rigid supporting base plate provided with the flexible plastic film is installed on a carrying plate, the evaporation source is bombarded by electron beams in a high-vacuum environment, the evaporation power is controlled, and the evaporation time is controlled to obtain the flexible iodide film. The preparation method is high in controllability, simple in process, environment-friendly, low in cost and capable of realizing large-scale preparation.

Description

technical field [0001] The invention belongs to the technical field of compound thin film preparation methods, relates to iodide thin films, and in particular to a preparation method of flexible iodide thin films. Background technique [0002] Flexible iodide thin films have a wide range of application values ​​in the field of flexible optoelectronic devices, and are the core key materials for flexible thin film solar cells, flexible photodetectors, and flexible light-emitting devices. [0003] Most of the existing preparation technologies use solution spin coating method, thermal evaporation method, and chemical vapor deposition method to prepare iodide thin films. The preparation of iodide thin films by solution spin coating has the disadvantages of low crystallinity, poor thickness controllability, low uniformity, toxicity and difficulty in preparing large-area thin films. The thermal evaporation method has severe fractionation of compound elements, deviation of the film...

AI Technical Summary

Problems solved by technology

The preparation of iodide films by solution spin coating has the disadvantages of low crystallinity of film materials, poor thickness controllability, low uniformity, toxicity and difficulty in preparing large-area films.

The thermal evaporation method has severe fractionation of compound elements, deviation of the film material composition, and heat radiation from the evaporation source to the film deposition substrate during the evaporation process, resulting in an increase in the substrate temperature; for the preparation of iodide films on plastic film substrates using this method When the substrate temperature rises, there will be severe thermal expansion and contraction, resulting in the low quality of the prepared iodide film and easy peeling and peeling.

Toxic, flammable, and explosive metal-organic sources are used in the preparation of iodide thin films by chemical vapor deposition, which has the disadvantages of complex process control, environmental protection, and high cost.