Chemical bath deposition method and CIGS photovoltaic module preparation method

Abstract

The invention relates to a chemical bath deposition method and a CIGS photovoltaic module preparation method. The chemical bath deposition method comprises the steps that a substrate is provided; a first functional layer and a composite material layer are respectively formed on opposite sides of the substrate, and the composite material layer comprises polymer hydrogel and magnetic nanoparticles mixed in the polymer hydrogel; the substrate with the first functional layer and the composite material layer is placed in a deposition solution, and the solution is deposited on the first functional layer to form a second functional layer; and the composite material layer is separated from the substrate. The chemical bath deposition method is adopted to the CIGS photovoltaic module preparation method. According to the chemical bath deposition method, the composite material layer is formed on one side of the substrate to be a protection layer, so that the side of the substrate is not in contact with the deposition solution; and meanwhile, the polymer hydrogel in the composite material layer swells in the reaction liquid, so that the circulation of the reaction liquid on the side of the substrate is reduced, invalid deposition of the second functional layer on the composite material layer is avoided, and the composite material layer is convenient to remove.

Description

technical field [0001] The invention relates to a chemical water-bath deposition method, in particular to an improved immersion-type chemical water-bath deposition method and using the method to prepare CIGS photovoltaic modules. Background technique [0002] The chemical bath deposition method, that is, chemical bath deposition (CBD), has the advantages of low cost, low film forming temperature, suitable for preparing large-area thin films, easy to realize continuous production, no pollution, and less material consumption, and is greatly favored by people. focus on. For example, in the structure of CIGS thin-film solar cells with high conversion efficiency, the cadmium sulfide (CdS) semiconductor thin film prepared by chemical water bath deposition method plays an important role as a buffer layer. Generally speaking, the chemical water bath deposition method of CdS film mainly includes the pre-mixing of cadmium sulfate, ammonia water, and pure water, adding thiourea, and C...

AI Technical Summary

Problems solved by technology

Therefore, the main problem of the immersion CBD process is that before the substrate enters, the generation of CdS particles has already started in the reaction solution and is suspended in the liquid, which has a negative impact on the coating process

The unpreheated substrate will be slowly heated by the solution, and the deposition rate of CdS is low in the early stage, resulting in a low utilization rate of the chemical solution.

In addition, in the immersion CBD process, both the front and back of the substrate will be deposited by CdS, and in the end only the CdS on the front is the effective film layer of the module, and the CdS film on the back will have to be cleaned, and the design of the back cleaning machine is also There are many technical challenges, which have become the bottleneck of the industrialization of infused CBD

[0004] In order to ensure the uniformity of the coating, the industry often tends to use rocking CBD, but the price of rocking CBD is high

Due to the low coating uniformity of immersion CBD, the cost of equipment will be greatly reduced compared with swing CBD, and it is also used in many industries

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