Low Pressure Diffusion System
Low Pressure Diffusion System
Brief Description
N-TOP Con has become one of the mainstream technical routes for the industrialization of N-type batteries. Boron diffusion is mainly used to make PN junctions on the front side in battery manufacturing, which is one of the key processes.
Categories PV Industry
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Main Features
The furnace body is specially designed for high temperature process (900~1100 ℃), which can effectively prevent the deformation of the furnace body and prolong the service life of the furnace body;
 Rapid cooling furnace body: The latest patented technology makes the furnace body temperature drop to the required temperature quickly, the cooling rate is increased by more than 25%, and the temperature uniformity in the furnace tube is obviously improved;
Advanced cascade temperature control and intelligent cooling technology, improve temperature stability and temperature control accuracy, and reduce temperature setting time;
The advanced fully closed-loop pressure control system can accurately detect and control the air pressure in the process chamber in real time;
Efficient exhaust gas treatment system, dry and wet separation, automatic discharge, greatly extend the maintenance cycle, reduce maintenance costs, and ensure the operating rate and process stability;
Innovative non-landing process method, the quartz boat is suspended during the process, which can effectively reduce the stress and deformation of the quartz tube, reduce the stickiness between the quartz devices, and prolong the service life;
The unique furnace door sealing design realizes the isolation of the metal and the reaction chamber, reduces heat loss, greatly prolongs the service life of the sealing ring, and ensures the stability of the pressure;
Stable source piping design reduces square resistance fluctuation caused by disturbance of environmental factors;
MES/CCRM system with complete architecture and outstanding performance.

Main Parameters
Item Technical Parameter
Process Method Closed tube low pressure diffusion
Effective inner diameter of reaction tube Ø430mm
Loading capacity Vertical loading method1600pcs/batch (166mm), 1400pcs/batch (182mm), 1200pcs/batch (210mm), 1200pcs/batch (230mm)
Horizontal loading method: 2600 tablets/batch (166mm), 2000 tablets/batch (182mm), 1800 tablets/batch (210mm), 1600 tablets/batch (230mm)
Square resistance and uniformity Intra-chip≤5% Inter-chip≤5% Lot-to-batch≤3% ( 50~110ohm/sq )
heating temperature Rt 1250°C
range of working temperature 600 ~ 1100°C
Temperature Control 6-point temperature control, internal and external dual-mode control
Heating method Automatic slope heating and fast constant temperature function
Cooling method The latest patented technology, 6 temperature zone section control active cooling furnace body
Maximum cooling rate ≥7℃/min (1100~900 ℃),≥6℃/min(900~700 ℃)
Accuracy and length of constant temperature zone ≤±0 . 5 ℃/2200m m (600 ~ 1 100℃)
Single point temperature stability ≤±0.5℃/4h(880℃)
Feeding method Adopt SiC cantilever propeller to automatically feed the film horizontally, the boat speed is continuously adjustable from 20 to 1000mm/min; the positioning accuracy is ≤±1 mm;
The ultimate vacuum of the system 20mbar
System air leak rate The rate of pressure rise after the pump is stopped and the valve is closed:< 2 mbar /min .
Pressure control method Closed loop fully automatic
Process control method Fully automatic, PLC + industrial computer, touch screen operation
Human-computer interface LCD display, touch operation, process editing, online monitoring, authority management, team management, networking function
MES optional
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