Drawer type annealing furnace for perovskite solar cell

Abstract

The utility model belongs to the technical field of annealing equipment, and relates to a drawer type annealing furnace for perovskite solar cells, which comprises a heating furnace body and a plurality of drawer supports, the heating furnace body is hollow, the front side surface of the heating furnace body is provided with feed ports with the same number as the drawer supports, and the drawer supports are arranged at the feed ports in a drawing manner; the heating furnace body is internally provided with heating plates located below the drawer support, the upper portion of the heating furnace body is provided with an air draft mechanism, gaps are reserved between the drawer support and the heating plates to form channels for air to flow horizontally, one side of the middle of each channel is provided with an air inlet, and all the heating plates are arranged up and down. The drawer support comprises a group of supporting plate assemblies used for supporting the perovskite substrate, and the supporting plate assemblies enter and exit from the heating furnace body. The annealing furnace is compact in size, small in occupied area, good in heating uniformity and high in temperature rising speed.

Description

Technical Field

[0001] The utility model relates to the technical field of annealing equipment, and particularly relates to a drawer-type annealing furnace for perovskite solar cells. Background Art

[0002] Perovskite annealing refers to the growth of perovskite grains by heating and controlling the temperature of the perovskite film layer, removing some impurities and defects, which is a key factor affecting the quality of perovskite solar cells. The annealing requires a fast heating rate and good temperature uniformity. The conventional annealing methods for large-area perovskite solar cells mainly include static heating by a flat hot plate or dynamic heating by a tunnel-type infrared lamp tube.

[0003] The static heating of the flat hot plate mainly relies on the hot plate for heating, and there are two ways of substrate contact and non-contact. The contact method will cause warping around the edges due to uneven heating of the glass itself (the heat dissipation around the glass is faster than that at the center position), resulting in inconsistent overall crystallization speed of the perovskite, and will preferentially crystallize from the center to the periphery step by step, generating circular stripes; the non-contact method can avoid the generation of circular stripes, but this heating method relying on thermal radiation leads to too low a heating rate of the perovskite substrate, resulting in poor crystallization effect of the perovskite film layer.

[0004] The dynamic heating of the tunnel-type infrared lamp tube mainly relies on the infrared lamp tube and circulating hot air to heat the substrate. However, due to the distance between the lamp tubes, the temperature uniformity on the surface of the substrate is poor. The dynamic movement of the glass can weaken this effect of temperature non-uniformity, but this results in a relatively long overall size of this annealing equipment and a large floor area.

[0005] Therefore, it is necessary to improve the structure of the annealing furnace to solve the above problems. Summary of the Utility Model

[0006] The main purpose of the utility model is to provide a drawer-type annealing furnace for perovskite solar cells, which has a compact volume, a small floor area, good heating uniformity, and a fast heating rate.

[0007] The utility model realizes the above purpose through the following technical solutions: A drawer-type annealing furnace for perovskite solar cells includes a heating furnace body and a plurality of drawer supports. The heating furnace body is hollow and has a feeding port on the front side with the same number as the drawer supports. The drawer supports are slidably arranged at the feeding port; a heating plate is arranged in the heating furnace body below the drawer supports, and an air extraction mechanism is arranged at the upper part of the heating furnace body. A gap is left between the drawer supports and the heating plate to form a channel for horizontal air flow. An air inlet is arranged on one side of the middle of each channel, and all the heating plates are arranged up and down; the drawer support includes a set of tray assemblies for supporting the perovskite substrate, and the tray assemblies enter and exit the heating furnace body.

[0008] Specifically, an auxiliary heating film is horizontally laid on the upper surface of the heating plate.

[0009] Specifically, the drawer bracket further includes a handle panel and a pair of sliding rods. The inner side of the handle panel faces the feeding port. The pallet assembly is fixed to the inner side of the handle panel. A pair of sliding rods are vertically fixed to the inner side of the handle panel and are located on both sides of the pallet assembly. The sliding rods horizontally pass through the outer wall of the heating furnace body, and the handle panel always moves outside the heating furnace body.

[0010] Furthermore, the projection range of the handle panel along the axis of the sliding rod is larger than the range of the feeding port.

[0011] Furthermore, the pallet assembly includes a pair of supporting rods vertically fixed to the inner side of the handle panel and four L-shaped supporting blocks respectively fixed to the two supporting rods in a group of two. An L-shaped stepped surface is recessed downward on the inner side of the corner of the L-shaped supporting block.

[0012] Specifically, the pallet assembly includes a pair of supporting rods vertically fixed to the inner side of the handle panel and a U-shaped bracket connecting the two supporting rods. A U-shaped stepped surface is provided on the inner edge of the U-shaped bracket.

[0013] The beneficial effects of the technical solution of the present utility model are as follows:

[0014] 1. In order to make better use of the space inside the heating furnace body, multiple drawer brackets can be arranged up and down here. Perovskite substrates are placed on each drawer bracket, so that multiple perovskite substrates can be annealed at one time, making the processing efficiency higher. It is compact in volume and small in floor area.

[0015] 2. Inside the heating furnace body is a heating cavity that is basically in a sealed state. The heat therein is provided by the heating plate. After the perovskite substrate is fed into this heating cavity, a ventilation space with uniform height will be partitioned inside. The air extraction mechanism can suck air from the air inlet and generate circulation by passing through the ventilation space. The heating plate is often heated by electric heating tubes, and the auxiliary heating film can conduct the heat of the heating plate to the entire surface. Then, on the one hand, it heats the lower surface of the perovskite substrate by thermal radiation, and on the other hand, it transfers the heat to the upper surface of the perovskite substrate through air circulation. The heating uniformity is good and the heating rate is fast. Description of the Drawings

[0016] Figure 1 It is a perspective view of the drawer-type annealing furnace in Embodiment 1;

[0017] Figure 2 It is Figure 1 a partial enlarged view of position A in

[0018] Figure 3 It is a cross-sectional view of the drawer-type annealing furnace;

[0019] Figure 4 It is the top view of the pallet assembly in Embodiment 1;

[0020] Figure 5 It is the top view of the pallet assembly in Embodiment 2.

[0021] The numbers in the figure represent:

[0022] 1 - Drawer - type annealing furnace,

[0023] 11 - Heating furnace body, 111 - Heating plate, 1111 - Auxiliary heating film, 112 - Exhaust mechanism, 113 - Feeding port, 114 - Air inlet,

[0024] 12 - Drawer support, 121 - Handle panel, 122 - Slide bar, 123 - Pallet assembly, 1231 - Support rod, 1232 - L - shaped support block, 12321 - L - shaped step surface, 1233 - U - shaped bracket, 12322 - U - shaped step surface;

[0025] 2 - Perovskite substrate. Specific embodiments

[0026] The following further describes the present utility model in detail with reference to specific embodiments.

[0027] Embodiment 1:

[0028] As Figure 1 shown, the drawer - type annealing furnace 1 for perovskite solar cells of the present utility model includes a heating furnace body 11 and a plurality of drawer supports 12. The heating furnace body 11 is hollow and has feeding ports 113 with the same number as the drawer supports 12 on the front side. The drawer supports 12 are slidably arranged at the feeding ports 113.

[0029] As Figure 3 shown, a heating plate 111 is arranged in the heating furnace body 11 below the drawer supports 12. An exhaust mechanism 112 is arranged at the upper part of the heating furnace body 11. An auxiliary heating film 1111 is horizontally laid on the upper surface of the heating plate 111. A gap is left between the drawer support 12 and the heating plate 111 to form a channel for horizontal air flow, and an air inlet 114 is arranged on one side of the middle of each channel. When the number of heating plates 111 is greater than 1, all heating plates 111 are arranged vertically.

[0030] Inside the heating furnace body 11 is a heating cavity that is basically in a sealed state. The heat therein is provided by the heating plate 111. After the perovskite substrate 2 is sent into this heating cavity, the cavity will be partitioned into a ventilation space with a uniform height. The air extraction mechanism 112 can suck air in from the air inlet 114 and pass through the ventilation space to generate circulation. The heating plate 111 is often heated by electric heating tubes, and the auxiliary heating film 1111 can conduct the heat of the heating plate 111 to the entire surface. Then, on the one hand, it heats the lower surface of the perovskite substrate 2 by thermal radiation, and on the other hand, it transfers the heat to the upper surface of the perovskite substrate 2 through air circulation. It has good heating uniformity and a fast heating rate. In order to make better use of the space inside the heating furnace body 11, multiple drawer brackets 12 can be arranged up and down here. Each drawer bracket 12 is placed with a perovskite substrate 2, so that multiple perovskite substrates 2 can be annealed at one time, making the processing efficiency higher. It has a compact volume and a small floor area.

[0031] As Figures 2 to 4 shown, the drawer bracket 12 includes a handle panel 121, a pair of sliding rods 122 and a set of tray components 123. The inner side of the handle panel 121 faces the feeding port 113. The tray components 123 are fixed to the inner side of the handle panel 121 and are used to support the perovskite substrate 2. A pair of sliding rods 122 are vertically fixed to the inner side of the handle panel 121 and are located on both sides of the tray components 123. The sliding rods 122 horizontally pass through the outer wall of the heating furnace body 11 to enable the tray components 123 to enter and exit the heating furnace body 11, and the handle panel 121 always moves outside the heating furnace body 11.

[0032] The drawer bracket 12 is equivalent to a tooling that remains connected to the heating furnace body 11. It is horizontally telescoped by the sliding rods 122. The tray components 123 are used to place and position the perovskite substrate 2, and the handle panel 121 is used to connect the sliding rods 122 and the tray components 123 and facilitate the operator to push and pull. The above connection relationship can ensure that the supporting surface of the tray components 123 faces upward, so that when the perovskite substrate 2 is sent into the chamber of the heating furnace body 11, it can maintain a parallel relationship with the heating plate 111, thus ensuring the uniformity of the heating condition.

[0033] As Figure 3 shown, the projection range of the handle panel 121 along the axis of the sliding rod 122 is larger than the range of the feeding port 113.

[0034] When the handle panel 121 is close to the feeding port 113, it can basically block it, which can reduce the escape of heated air and is beneficial to maintaining the annealing temperature.

[0035] As Figures 2 to 4As shown in the figure, the pallet assembly 123 includes a pair of pallet rods 1231 vertically fixed to the inner side of the handle panel 121, and four L-shaped pallet blocks 1232 fixed to the two pallet rods 1231 in a group of two. A stepped surface 12321 recessed downward is provided on the inner side of the corner of the L-shaped pallet block 1232.

[0036] The L-shaped stepped surface 12321 is the supporting surface on the L-shaped pallet block 1232. The outer side of the L-shaped pallet block 1232 is higher than the L-shaped stepped surface 12321, which can form a limit on the corners of the perovskite substrate 2 and also enable the perovskite substrate 2 to be closer to the upper surface of the heating plate 111, thereby improving the energy efficiency of thermal radiation.

[0037] Embodiment 2:

[0038] As Figure 5 shown, the difference from Embodiment 1 is that the four L-shaped pallet blocks 1232 are replaced by a U-shaped bracket 1233 connecting the two pallet rods 1231, and a U-shaped stepped surface 12331 is provided on the inner edge of the U-shaped bracket 1233.

[0039] The L-shaped pallet blocks 1232 can only hold the four corners of the perovskite substrate 2. If the area of the perovskite substrate 2 is relatively large, edge bending is likely to occur due to gravity. This U-shaped bracket 1233 can support three sides of the perovskite substrate 2, with a larger support range. Therefore, Embodiment 2 is more suitable for use on large-area perovskite substrates. Here, the U-shaped stepped surface 12331 can also play a role in limiting the corners of the perovskite substrate 2 and improving the energy efficiency of thermal radiation.

[0040] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the creative concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A drawer-type annealing furnace for perovskite solar cells, characterized in that: It comprises a heating furnace body and a plurality of drawer brackets, wherein the heating furnace body is hollow and the front side is provided with feeding ports of the same number as the drawer brackets, and the drawer brackets are drawable and arranged at the feeding ports; a heating plate is arranged in the heating furnace body and located below the drawer bracket, and an exhaust mechanism is arranged on the upper part of the heating furnace body, and a gap is left between the drawer bracket and the heating plate to form a channel for horizontal air flow, and an air inlet is arranged on one side of the middle part of each channel, and all the heating plates are arranged up and down; the drawer bracket comprises a group of support plate assemblies for supporting the perovskite substrate, and the support plate assemblies enter and exit the heating furnace body.

2. The drawer-type annealing furnace according to claim 1, characterized in that: An auxiliary heating film is horizontally laid on the upper surface of the heating plate.

3. The drawer-type annealing furnace according to claim 1, characterized in that: The drawer bracket also includes a handle panel and a pair of sliding rods, the inner side of the handle panel faces the feed port, the support plate assembly is fixed to the inner side of the handle panel, a pair of sliding rods are vertically fixed to the inner side of the handle panel and are located on both sides of the support plate assembly, the sliding rods horizontally pass through the outer wall of the heating furnace body, and the handle panel always moves outside the heating furnace body.

4. The drawer-type annealing furnace according to claim 3, characterized in that: The projection range of the handle panel along the axis of the slide rod is larger than the range of the feeding port.

5. The drawer-type annealing furnace according to claim 3, characterized in that: The support plate assembly includes a pair of support rods vertically fixed to the inner side of the handle panel and four L-shaped support blocks fixed to the two support rods in groups of two. The inner side of the corner of the L-shaped support block is provided with an L-shaped step surface recessed downward.

6. The drawer-type annealing furnace according to claim 3, characterized in that: The support plate assembly comprises a pair of support rods vertically fixed to the inner side of the handle panel and a U-shaped support bracket connecting the two support rods, and the inner edge of the U-shaped support bracket is provided with a U-shaped step surface.

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