Preparation method of black-edge-free high-efficiency polycrystalline silicon ingot
A technology for polycrystalline silicon ingots without black borders, applied in polycrystalline material growth, chemical instruments and methods, crystal growth, etc., can solve problems such as high production costs, easy sticking, and large black border width, and achieve photoelectric conversion efficiency. The effect of reducing manufacturing costs and reducing the proportion of low-efficiency leakage
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[0032] Example 1
[0033] A method for preparing high-efficiency polycrystalline silicon ingots without black edges, the method steps are as follows:
[0034] 1) Prepare high-purity quartz sand slurry, using high-purity quartz sand for single crystal crucible with a particle size of 100 mesh and purity of 99.995% and high-purity quartz sand for polycrystalline crucible with a particle size of 250 mesh and purity of 99.99%. :1 weight ratio is mixed uniformly to obtain quartz sand; the content of Fe element is 4ppm deionized water as the binder; then the quartz sand and the binder are mixed according to the weight ratio of 1:2 and uniformly stirred to obtain high purity quartz Mortar
[0035] 2)Prepare high-purity fine mortar, use a polycrystalline crucible with a particle size of 600 mesh and a purity of 99.99%, mix high-purity quartz sand and binder water at a weight ratio of 1:2, and mix well to obtain high-purity fine mortar material;
[0036] 3) Prepare silicon nitride slurry, mi...
Example Embodiment
[0044] Example two
[0045] A method for preparing high-efficiency polycrystalline silicon ingots without black edges, the method steps are as follows:
[0046] 1) Prepare high-purity quartz sand slurry, using high-purity quartz sand for single crystal crucible with a particle size of 150 mesh and purity of 99.995% and high-purity quartz sand for polycrystalline crucible with a particle size of 400 mesh and purity of 99.99%. : The weight ratio of 5 is mixed uniformly to obtain quartz sand; the content of Fe element is 4.5ppm deionized water as the binder; the quartz sand and the binder are mixed at a weight ratio of 1:4, and the mixture is uniformly stirred to obtain high purity Quartz sand slurry;
[0047] 2) Preparing high-purity fine mortar, using a polycrystalline crucible with a particle size of 600 mesh and a purity of 99.99%, mixing high-purity quartz sand and binder water in a weight ratio of 1:4, and mixing uniformly to obtain high-purity fine mortar material;
[0048] 3) P...
Example Embodiment
[0056] Example three
[0057] A method for preparing high-efficiency polycrystalline silicon ingots without black edges, the method steps are as follows:
[0058] 1) Preparing high-purity quartz sand slurry, using high-purity quartz sand for single crystal crucible with a particle size of 130 mesh and purity of 99.995% and high-purity quartz sand for polycrystalline crucible with a particle size of 330 mesh and purity of 99.999%. :4.5 The weight ratio is mixed uniformly to obtain quartz sand; the content of Fe element is 4.5ppm deionized water as the binder; the quartz sand and the binder are mixed at a weight ratio of 1:3.5 and mixed evenly to obtain high purity Quartz sand slurry;
[0059] 2) Prepare high-purity fine mortar, use a polycrystalline crucible with a particle size of 660 mesh and a purity of 99.99%. Mix the high-purity quartz sand and the binder water at a weight ratio of 1:3, and mix well to obtain high-purity fine mortar. material;
[0060] 3) Prepare silicon nitride...
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