A slit coating knife head

Abstract

The utility model discloses a slit coating knife head, comprising an upper die head, a first gasket and a lower die head that cooperate with each other, an inert gas outlet device that cooperates with the upper die head is arranged on the upper die head, the interior of the inert gas outlet device includes an outlet hole, a gas guide groove that guides the gas to the outside of the coating end of the coating head is arranged between the upper die head and the inert gas outlet device, and the outlet hole inside the inert gas outlet device is connected to the gas guide groove. The utility model focuses on the slit coating knife head, optimizes the knife head structure design, adopts a multi-cavity structure design, makes the precursor liquid keep the liquid film in an inert gas protection environment during the coating process, and then cooperates with the air knife process to complete the preparation of narrow bandgap perovskite film in the air.

Description

Technical Field

[0001] The utility model belongs to the technical field of slit coating, and in particular relates to a slit coating cutter head. Background Art

[0002] With the explosive growth of the photovoltaic industry, the efficiency of N-type silicon battery modules has exceeded 24%, approaching the efficiency limit of crystalline silicon batteries. As a new favorite in the photovoltaic industry, perovskite batteries have emerged with an efficiency exceeding 26%. At the same time, the efficiency of perovskite / perovskite stacked batteries (full calcium stacked) has exceeded 28.0%, surpassing the record of 26.7% set by single-crystal silicon batteries.

[0003] Although small-area all-calcium stacked cells have achieved impressive results, with the acceleration of the large-scale industrialization of perovskites, the stability of the perovskite cell preparation process has limited its competition with traditional crystalline silicon cells in the field of photovoltaic power stations. Large-area perovskite films are mainly prepared by slit coating and wet coating. The bottleneck of preparing all-calcium stacks is how to prepare large-area narrow band gaps in the air. The traditional solution is to place the coating equipment under inert gas protection and optimize the narrow band gap formula, but it still cannot solve the problems of oxidation in the air and difficult operation. Summary of the invention

[0004] In order to solve the problems of oxidation and operation difficulty in preparing a large-area narrow-bandgap perovskite film in air, the utility model provides a slit coating knife head.

[0005] A slit coating knife head comprises an upper die head, a first gasket and a lower die head which cooperate with each other, wherein an inert gas outlet device which cooperates with the upper die head is arranged on the upper die head, the interior of the inert gas outlet device comprises outlet holes, a gas guide groove which guides gas to the outside of the coating end of the coating head is arranged between the upper die head and the inert gas outlet device, and the outlet holes inside the inert gas outlet device are communicated with the gas guide groove.

[0006] Furthermore, the inert gas outlet device, the upper die head and the lower die head are fastened by fastening bolts.

[0007] Furthermore, a second gasket is provided between the inert gas outlet device and the upper die head.

[0008] Furthermore, the gas guide groove is a groove arranged on any surface where the inert gas outlet device and the upper die head are connected.

[0009] The slit coating knife head provided by the utility model includes a lower die head, a first gasket, an upper die head and an inert gas outlet device from bottom to top, wherein the lower die head, the first gasket, the upper die head and the inert gas outlet device are tightly fixed by bolts, wherein any one side between the upper die head and the inert gas outlet device is used to open a groove to form a gas guide groove, and the other side is kept flat for gas direction diversion, and the shape of the gas guide groove can be consistent with the traditional coating head or multiple openings can be gathered in one groove for air outlet, and a gasket can also be arranged between the upper die head and the inert gas outlet device to improve the uniformity of the inert gas outlet. The upper die head or the inert gas outlet device needs to open a hole inside and connect the gas guide groove for gas transportation.

[0010] When the slit coating knife head provided by the utility model is coating, the position of the inert gas outlet device is the same as the coating direction, and the position of the lower die head is opposite to the coating direction. The direction needs to be paid attention to during coating. The inert gas can be a mixture of helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon. The method of using the narrow band gap coating is as follows: (a) before formal coating, a certain amount of inert gas is introduced and a continuous airflow is maintained (b) during coating, the amount of inert gas is adjusted and the air knife is turned on (c) during the coating return stroke, the air knife is turned off, and (d) after the return stroke is completed, the inert gas flow is turned off.

[0011] Before coating narrow bandgap perovskite or single junction narrow bandgap perovskite in full calcium stack, the inert gas outlet is adjusted to make the atmosphere in a small area become inert gas before the coating knife is lowered, which not only isolates oxygen but also reduces humidity, which is beneficial to the preservation of the precursor liquid in the coating head. Before coating, the inert gas outlet is reduced and the wind knife is turned on to promote the crystallization of perovskite. In this way, the inert gas drainage in the front and the inert gas in the back can keep the precursor liquid under the protection of the inert gas at a lower coating height. When the coating action completes the process of returning to zero, the wind knife is turned off, and the inert gas flow is turned off after reaching zero. Under the triple protection, Sn in the narrow bandgap perovskite precursor can be guaranteed. 2+ Oxidized to Sn 4+ At the same time, it reduces the amount of inert gas used, which saves costs, and then completes the preparation of large-area all-calcium stacks and narrow-bandgap perovskite cells in the air. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of the slit coating blade provided by the utility model;

[0013] Figure 2 This is a working schematic diagram of the slit coating knife head provided by the utility model.

[0014] Among them, 1 is an upper die head, 2 is a first gasket, 3 is a lower die head, 4 is an inert gas outlet device, 41 is an outlet hole, 5 is a gas guide groove, 6 is a fastening bolt, 7 is a narrow-band precursor liquid, 8 is an air knife, 9 is a substrate, and 10 is a narrow-band precursor liquid film. DETAILED DESCRIPTION

[0015] The slit coating blade provided by the utility model is further described below in conjunction with the accompanying drawings.

[0016] like Figure 1 and Figure 2 As shown, a slit coating knife head provided in an embodiment of the utility model comprises an upper die head 1, a first gasket 2 and a lower die head 3 which cooperate with each other, an inert gas outlet device 4 which cooperates with the upper die head 1 is arranged on the upper die head 1, the interior of the inert gas outlet device 4 comprises an outlet hole 41, a gas guide groove 5 which guides the gas to the outside of the coating end of the coating head is arranged between the upper die head 1 and the inert gas outlet device 4, and the outlet hole 41 inside the inert gas outlet device 4 is connected with the gas guide groove 5. The inert gas outlet device 4, the upper die head 1 and the lower die head 3 are fastened by fastening bolts 6. The gas guide groove 5 is a groove arranged on any surface where the inert gas outlet device 4 and the upper die head 1 are connected.

[0017] In some other embodiments of the present invention, a second gasket may be provided between the inert gas outlet device 4 and the upper die head 1 to make the air outlet more uniform.

[0018] During the operation of the slit coating knife head provided by the utility model, the outlet position of the inert gas outlet device is the same as the coating direction, and the position of the lower die head is opposite to the coating direction. The direction needs to be paid attention to during coating. The inert gas can be a mixture of helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon. Method of use for narrow bandgap coating: (a) introduce a certain amount of inert gas before formal coating and maintain continuous airflow; (b) adjust the amount of inert gas and turn on the air knife during coating; (c) turn off the air knife during the coating return stroke; (d) turn off the inert gas flow after the return stroke is completed.

[0019] Through the above technical scheme, before coating narrow bandgap perovskite or single junction narrow bandgap perovskite in full calcium stack, by adjusting the inert gas outlet, the atmosphere in a small area is changed to inert gas before the coating knife is lowered, which not only plays a role in isolating oxygen but also plays a role in reducing humidity, which is beneficial to the preservation of the precursor liquid in the coating head. Before coating, the inert gas outlet is reduced and the wind knife is turned on to promote the crystallization of perovskite. In this way, the inert gas drainage in the front and the inert gas in the back wind knife can keep the precursor liquid under the protection of the inert gas at a lower coating height throughout the whole process. The wind knife is turned off when the coating action completes the process of returning to zero point, and the inert gas flow is turned off after reaching zero point. Under the triple protection, Sn in the narrow bandgap perovskite precursor can be guaranteed. 2+ Oxidized to Sn 4+ At the same time, it reduces the amount of inert gas used, which saves costs, and then completes the preparation of large-area all-calcium stacks and narrow-bandgap perovskite cells in the air.

Claims

1. A slit coating blade, characterized in that: The invention comprises an upper die head (1), a first gasket (2) and a lower die head (3) which cooperate with each other, and is characterized in that an inert gas outlet device (4) which cooperates with the upper die head (1) is arranged on the upper die head (1), the interior of the inert gas outlet device (4) comprises an outlet hole (41), a gas guide groove (5) which guides the gas to the outside of the coating end of the coating head is arranged between the upper die head (1) and the inert gas outlet device (4), and the outlet hole (41) inside the inert gas outlet device (4) is connected to the gas guide groove (5).

2. The slit coating blade according to claim 1, characterized in that: The inert gas outlet device (4), the upper die head (1) and the lower die head (3) are fastened by fastening bolts (6).

3. The slit coating blade according to claim 1, characterized in that: A second gasket is provided between the inert gas outlet device (4) and the upper die head (1).

4. The slit coating blade according to claim 1, characterized in that: The gas guide groove (5) is a groove arranged on any surface where the inert gas outlet device (4) and the upper die head (1) are connected.

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