How is molybdenum heater applied in PERC cell sintering process?
Background of the Development of PERC Cell Technology
PERC cells are the most prevalent kind of solar panel technology today. They can convert more than 25% of solar light into power. Initially, the primary cause of PERC cells functioning so effectively is a unique layer on the back. Another film helps keep more of the energy generated by daylight from being wasted. Another causes the cells generate greater energy. The procedure of curing PERC cells is very crucial because it influences how efficiently they perform and how long they endure.
Core Requirements of PERC Cell Sintering Process
01
High-temperature sintering environment
The sintering process of PERC cell usually needs to be carried out at a temperature range of 800-900°C to achieve a good contact between the aluminum paste and the silicon wafer and an alloying reaction.
02
Precise temperature control
Minor fluctuations in sintering temperature may affect the sintering effect of the aluminum paste and subsequently the conversion efficiency of the battery. Therefore, temperature control accuracy within ±5°C is required.
03
Uniform heating distribution&Fast heating and cooling
The uniformity of the temperature on the surface of the cell directly affects the performance consistency of the cell. It is required to achieve a temperature uniformity within ±2°C.To improve production efficiency, fast heating (up to 50°C/second) and cooling rates are required to shorten the sintering cycle.
Technical Advantages of Molybdenum Heater in PERC Cell Sintering
High-temperature stability
The molybdenum heater functions effectively at high temperatures, from 800 to 900°C. It doesn't warp or cease working correctly.
Because molybdenum remains durable and doesn't corrode readily when it's very elevated, it can be employed for a long time in intense, corroded places. Certain helps the machinery endure for a greater duration.
Precise temperature control
The molybdenum heater adopts an advanced temperature control system, which can achieve a temperature control accuracy of ±1°C, meeting the strict requirements of the PERC battery sheet sintering process.
The rapid heating rate and precise temperature regulation capability can realize complex sintering process curves, optimizing the performance of the battery sheet.
Uniform heating distribution
The structural design of the molybdenum heater has been optimized to achieve uniform heating distribution on the surface of the battery sheet, ensuring consistent sintering effects in all areas of the battery sheet.
The use of a multi-zone heating design, through independent control of the heating power in different zones, further improves temperature uniformity.
Low pollution characteristics
The solar photovoltaic industry has extremely high requirements for the cleanliness of battery sheets. The high purity and low vapor pressure characteristics of the molybdenum heater ensure that no impurities are released to the battery sheet during high-temperature heating, avoiding contamination of the battery sheet.
The chemical stability of molybdenum ensures that it does not produce volatile substances in the high-temperature oxidation environment, further guaranteeing the cleanliness of the battery sheet.
Comparing Molybdenum Heating elements to Alternative Heating devices
Molybdenum heating units are superior for the PER battery sheet fusion procedure compared to other warmers. Once, here's why:
Can manage high temperatures
Molybdenum warming devices work well at 800-900°C. Originally, more radiators, such as stainless steel ones, have the ability to go up to 600°C.
Molybdenum remains durable and doesn't corrode effortlessly at high temperatures. It means it is capable of being used in warm, humid environments for a long time. Simultaneously, various thermal units are permitted to warp or oxidize in high temperatures.
Exact heat level regulation
Molybdenum heating elements are able to manage the thermal state very exactly, within ±1°C. Separate heating devices are capable of merely govern degree in the range of ±5°C.
Molybdenum heating units elevate temperature quickly and have the ability to be modified accurately. Lately, that lets them withstand challenging melting phases. Alternative warmers cannot perform the aforementioned as well.
Chemical stability
The high purity and low vapor pressure characteristics of the molybdenum heater ensure that no impurities are released to the battery sheet during high-temperature heating, while other types of heaters may release impurities during high-temperature heating, contaminating the battery sheet.
The chemical stability of molybdenum ensures that it is not prone to volatile substances in the high-temperature oxidation environment, while other types of heaters are prone to volatile substances in the high-temperature environment, contaminating the battery sheet.
Future Development Trends
Demand for Larger Wafer Sizes
With the continuous advancement of semiconductor technology, wafer sizes are expected to further increase (such as 18 inches). The molybdenum heater needs to be continuously optimized for design to meet the annealing requirements for larger wafer sizes.
Higher Temperature Requirements
Future semiconductor manufacturing processes may require higher annealing temperatures to achieve more advanced device performance. The molybdenum heater needs to further enhance its high-temperature stability and oxidation resistance to adapt to the process requirements of higher temperatures.
Summary
Intelligence and Automation
With the development of Industry 4.0, semiconductor manufacturing equipment will move towards the direction of intelligence and automation. The molybdenum heater needs to integrate more sensors and control systems to achieve more precise temperature control and remote monitoring.
Through an in-depth analysis of the application of molybdenum heaters in the sintering process of PERC solar cell wafers, we can observe the significant position and broad application prospects of molybdenum heaters in the solar photovoltaic industry. With the continuous advancement of photovoltaic technology, molybdenum heaters will continue to demonstrate their unique advantages and provide reliable technical support for the efficient manufacturing of solar cells.
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Ava
