LR03 battery.Small knowledge and technical requirements for polycrystalline silicon materials in solar energy

　　A. Solar grade polysilicon material

　　skills requirement:

　　Overall requirements: Silicon content 99.9999% Boron content: <0.20ppba Phosphorus content: <0.90ppba Carbon content: <1.00ppba Metal content: <30.00ppba Metal surface content: <30.00ppba Size requirements: 25mm---250mm Polycrystalline type: p-type resistivity: >0.50OhmcmB, broken semiconductor grade silicon wafer

　　skills requirement:

　　Semiconductor-grade silicon wafers are in the shape of arc-shaped chips. The thickness of the chip is >=400um. The model is p-type. Resistivity: >0.50OhmcmC, small polysilicon.

　　skills requirement

　　1. The model is N type, the resistivity is greater than 50ohmcn, the carbon content is less than 5*1016/cm3, and the fluorine content is less than 5*1017/cm3

　　2. The block size is 4mm

　　3. There should be no oxide interlayers and infusible materials, and it is best to use wash-free materials.

　　D. Czochralski polysilicon

　　skills requirement

　　1. The phosphorus detector is N-type, with a resistivity greater than 100ohmcm, and the boron detector is p-type, with a resistivity greater than 1000ohmcm. The carrier lifetime is 100um longer, the carbon content is less than 1016cm3, and the oxygen content is less than 1017cm3

　　2. The block is less than 30mm

　　3. There should be no oxide interlayers and infusible materials, and it is best to use wash-free materials.

　　E. Zone melting head and tail material

　　skills requirement

　　1.N type, resistivity is greater than 50chmom and minority carrier lifetime is greater than 100μm

　　2. The block is larger than 30mm

　　3. There should be no bubbles in the zone melting head and tail materials, no contamination caused by contact with the coil, and no flowing silicon or infusible matter from the zone melting process.

　　4. Preferably no-wash material

　　F. Straight-pull head and tail materials (IC materials), preferably no-wash materials

　　1.N type, resistivity is greater than 10ohmom

　　2.p type, resistivity greater than 0.5ohmom

　　3. The block is larger than 30mm and the thickness is larger than 0.5mm.

　　4. There should be no air bubbles or infusible matter in the straight-pull head and tail materials.

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