A single-crystal visible doping device

Abstract

This utility model relates to the field of photovoltaic manufacturing technology, specifically to a single-crystal visible doping device, including a loading cavity for receiving a material scoop. An observation window for observing the material scoop is installed at the top of the loading cavity. The observation window is located at the top of the material scoop receiving cavity, and the top of the loading cavity also has a mounting component for easy installation and removal of the observation window. This utility model, by opening an observation window at one end of the loading cavity, allows for confirmation during the loading stage whether the alloy is accurately loaded into the scoop and whether any spillage has occurred. During the purification process, it directly monitors the dynamic changes of the antimony master alloy powder during vacuuming / gas filling, avoiding accidental losses due to airflow disturbances. The window's position allows the line of sight to be directly facing the scoop opening, enabling inspection of any residual alloy inside the scoop without the need for a push-out device. By disassembling the guide block, multiple push-out springs simultaneously push out the observation window, reducing the difficulty of disassembling and replacing the observation window.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic manufacturing technology, specifically to a single-crystal visible doping device. Background Technology

[0002] Currently, N-type silicon rods and wafers used in photovoltaic cells are mainly phosphorus-doped monocrystalline silicon. Phosphorus has a segregation coefficient of 0.35, resulting in a significant difference in resistivity between the beginning and end of the N-type monocrystalline silicon rod. Due to the segregation limitation of the dopant phosphorus, a narrower resistivity range is generally achieved by shortening the rod length, which increases the actual crystal pulling cost.

[0003] By controlling the concentration of antimony (segregation coefficient 0.023) in single-crystal silicon rods, it is possible to obtain single-crystal silicon rods with excellent resistivity range and resistivity concentration, maintaining resistivity uniformity even at longer rod lengths. The specific principle is that during the doping process, due to the difference in evaporation rates, both antimony and phosphorus dopants simultaneously influence the resistivity of the silicon ingot in the early stages of crystal pulling. As time progresses, the contribution of antimony decreases, and when antimony has completely evaporated (i.e., in the later stages of crystal pulling), only phosphorus dopant plays a role, making the resistivity at the head and tail of the ingot more similar, thus improving the uniformity of axial resistivity. Consequently, the resistivity uniformity in the silicon wafer is also improved. However, antimony evaporates rapidly in silicon solution, requiring multiple replenishment during the single-crystal silicon rod pulling process. Using existing replenishment equipment can lead to difficulties in timely monitoring of the alloy within the device. Existing equipment suffers from limitations due to the physical properties of antimony (rapid volatilization) and blind spots in equipment observation (inability to track the addition process and residues in real time), resulting in delayed doping, uncontrolled concentration, and excessive resistance, which are industry pain points for large-size antimony-doped single crystals.

[0004] Therefore, it is necessary to invent a single-crystal visible doping device to solve the above problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a single-crystal visual doping device, which solves the problems of blind spots in existing equipment during actual use, leading to delayed doping, uncontrolled concentration, and excessive resistance.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A single-crystal visual doping device includes a loading cavity for receiving a scoop, an observation window for observing the scoop is installed at the top of the loading cavity, the observation window is located at the top of the scoop receiving cavity, and the top of the loading cavity is also provided with a mounting component for easy installation and removal of the observation window.

[0008] As a preferred embodiment of this utility model, the observation window is provided with slots on both sides, and the mounting component includes a guide block, the end of the guide block facing the observation window extending into the slot.

[0009] As a preferred embodiment of this utility model, the mounting component further includes a locking block fixedly mounted on the top of the loading cavity. One end of the locking block is in contact with the end face of the guide block. The guide block is provided with an extension plate at the top of the locking block. The top of the extension plate is provided with a plurality of locking bolts that are threadedly connected to the bottom guide block.

[0010] As a preferred embodiment of this utility model, the locking block has a groove at the location of the second locking bolt, and a plurality of ejector springs are provided on the inner side of the groove, and the ejector springs are sleeved on the outer side of the second locking bolt.

[0011] As a preferred embodiment of this utility model, a sealing frame is fitted on the outer side of the observation window, and the inner end face of the sealing frame is in contact with the outer end face of the observation window.

[0012] As a preferred embodiment of this utility model, threaded holes are provided at both ends of the guide block, and multiple locking bolts that form a threaded connection with the threaded holes are provided on the outer side of the sealing frame.

[0013] As a preferred embodiment of this utility model, a limiting frame is fixedly installed at the top of the loading cavity, and the inner end face of the limiting frame is in contact with the end face of the sealing frame and the locking block.

[0014] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0015] In this invention, an observation window is provided at one end of the loading chamber. This window allows for the confirmation of whether the alloy is accurately loaded into the scoop and whether any spillage has occurred during the loading stage. During the purification process, the dynamic changes (dust, volatilization, agglomeration) of the antimony master alloy powder during vacuuming / gas filling are directly monitored, preventing accidental losses due to airflow disturbances. The window position allows for direct line of sight to the scoop opening, enabling inspection of any residual alloy in the scoop without the need for a push-out device. An installation component is provided on the outside of the observation window. This component allows for the simultaneous ejection of the observation window by disassembling the guide block and utilizing multiple ejection springs when the observation window is damaged, reducing the difficulty of disassembling and replacing the observation window. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the observation window structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the installation component structure of this utility model;

[0019] Figure 4 This utility model Figure 3 Enlarged structural diagram at point A in the middle;

[0020] Figure 5 This is an exploded view of the mounting components of this utility model.

[0021] Explanation of reference numerals in the attached drawings: 1. Scoop; 2. Loading cavity; 3. Observation window; 301. Slot; 4. Mounting component; 401. Guide block; 402. Locking block; 403. Limiting frame; 404. Sealing frame; 405. Locking bolt one; 406. Ejection spring; 407. Locking bolt two; 408. Groove; 409. Extension plate. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0023] This utility model provides, for example Figure 1-5 The single-crystal visual doping device shown includes a loading cavity 2 for receiving a scoop 1. An observation window 3 for observing the scoop 1 is installed at the top of the loading cavity 2. The observation window 3 is located at the top of the scoop 1 receiving cavity. A mounting component 4 is also provided at the top of the loading cavity 2 to facilitate the installation and removal of the observation window 3. The observation window 3 is made of gold-plated glass to be designed for and adapted to high-temperature, high-radiation environments; the gold film can isolate and reflect most of the heat radiation.

[0024] The observation window 3 has slots 301 on both sides. The mounting component 4 includes a guide block 401, with one end of the guide block 401 facing the observation window 3 extending into the slot 301. The guide block 401 is inserted into both sides of the slot 301. During the installation of the observation window 3, the locking block 402 can guide the guide block 401 with the observation window 3, making it easier to install in the designated position and reducing the difficulty of positioning.

[0025] The mounting component 4 also includes a locking block 402 fixedly mounted on the top of the loading cavity 2. One end of the locking block 402 is abutted against the end face of the guide block 401. The guide block 401 has an extension plate 409 at the top of the locking block 402. The top of the extension plate 409 has multiple locking bolts 407 that are threadedly connected to the bottom guide block 401. When the extension plate 409 is abutted against the top of the locking block 402, the position of the slot 301 is abutted against the top plane of the loading cavity 2, improving the sealing of the observation window 3.

[0026] The locking block 402 has a groove 408 at the location of the second locking bolt 407. Multiple ejector springs 406 are provided inside the groove 408, and these ejector springs 406 are sleeved on the outside of the second locking bolt 407. The ejector springs 406 are designed to simultaneously push out the observation window 3 during disassembly, reducing the difficulty of disassembly.

[0027] A sealing frame 404 is fitted around the outer side of the observation window 3, and the inner end face of the sealing frame 404 fits against the outer end face of the observation window 3. The sealing frame 404 is provided to protect multiple end faces of the observation window 3 and prevent the corners of the observation window 3 from being damaged by impact.

[0028] The guide block 401 has threaded holes at both ends, and the outer side of the sealing frame 404 is provided with multiple locking bolts 405 that are threadedly connected to the threaded holes. The sealing frame 404 is installed with the guide block 401 by locking bolts 407. When the inner side of the observation window 3 is contaminated by dust particles, the observation window 3 can be directly disassembled by removing the locking bolts 405, making it easy to wipe the inner side of the observation window 3.

[0029] A limiting frame 403 is fixedly installed at the top of the loading cavity 2. The inner end face of the limiting frame 403 is in contact with the end faces of the sealing frame 404 and the locking block 402. The limiting frame 403 is provided to seal the two end faces of the sealing frame 404. A sealing ring is provided on the side of the limiting frame 403 facing the sealing frame 404 to improve the sealing effect of the device.

[0030] This invention features an observation window 3 at one end of the loading chamber 2. This window allows for monitoring during the loading stage to ensure the alloy is accurately placed into the scoop and that no spillage occurs. During the purification process, it directly monitors the dynamic changes of the antimony master alloy powder during vacuuming / gas filling, preventing dust, volatilization, and agglomeration, thus avoiding accidental losses due to airflow disturbances. The window position allows for direct viewing of the scoop opening, eliminating the need for a push-out device to check for residual alloy inside the scoop 1. An installation component 4 is located on the outside of the observation window 3. This component allows for easy removal and replacement of the observation window 3 by disassembling the guide block 401 and simultaneously using multiple push-out springs 406 if the observation window 3 is damaged.

[0031] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A single crystal visual compensating doping apparatus, characterized by: It includes a loading cavity (2) for storing a spoon (1), and an observation window (3) for observing the spoon (1) is installed at the top of the loading cavity (2). The observation window (3) is located at the top of the receiving cavity of the spoon (1). The top of the loading cavity (2) is also provided with a mounting component (4) for easy installation and removal of the observation window (3).

2. A single crystal visual up-dopant device according to claim 1, wherein: The observation window (3) has slots (301) on both sides, and the mounting component (4) includes a guide block (401). The end of the guide block (401) facing the observation window (3) extends into the slot (301).

3. A single crystal visual up-dopmg device according to claim 2, wherein: The mounting component (4) also includes a locking block (402) fixedly mounted on the top of the loading cavity (2). One end of the locking block (402) is in contact with the end face of the guide block (401). The guide block (401) is provided with an extension plate (409) at the top of the locking block (402). The top of the extension plate (409) is provided with a plurality of locking bolts (407) that are threadedly connected to the bottom guide block (401).

4. A single crystal visual up-dopmg device as defined in claim 3, wherein: The locking block (402) has a groove (408) at the location of the second locking bolt (407). Multiple ejector springs (406) are provided on the inner side of the groove (408), and the ejector springs (406) are sleeved on the outer side of the second locking bolt (407).

5. A single crystal visual upconversion device as claimed in claim 2, characterized in that: A sealing frame (404) is fitted on the outside of the observation window (3), and the inner end face of the sealing frame (404) is in contact with the outer end face of the observation window (3).

6. A single crystal visual upconversion device as claimed in claim 5, characterized in that: The guide block (401) has threaded holes at both ends, and the outer side of the sealing frame (404) is provided with a plurality of locking bolts (405) that are threadedly connected to the threaded holes.

7. A single crystal visual upconversion device according to claim 6, wherein: A limiting frame (403) is fixedly installed at the top of the loading cavity (2), and the inner end face of the limiting frame (403) is in contact with the end face of the sealing frame (404) and the locking block (402).

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