A kind of reduce the method for oxygen content bottom polycrystalline silicon ingot casting

A kind of reduce the method for oxygen content bottom polycrystalline silicon ingot casting

  • CN 106,087,048 A
  • Filed: 08/19/2016
  • Published: 11/09/2016
  • Est. Priority Date: 08/19/2016
  • Status: Active Application
First Claim
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1. one kind is reduced the method for oxygen content bottom polycrystalline silicon ingot casting, it is characterised in that the method comprises the following steps:

  • Prepared by step one, crucible bottom coating, process is as follows;

    Step 101, coating spraying liquid are prepared;

    by organic cementing agent, deionized water and boron nitride by 1;

    (2~

    2.5);

    (0.8~

    1.2) mass ratio uniformly mixes, and obtains coating spraying liquid;

    Step 102, spraying;

    use spraying equipment by the inside of the even application of coating spraying liquid described in step 101 to crucible (1)On bottom surface, 1m in described crucible (1) inner bottom surface2In region, in the described coating spraying liquid of spraying, the quality of contained boron nitride is100g~

    200g;

    Described crucible (1) is quartz crucible for polycrystalline ingot furnace;

    Step 103, drying;

    crucible described in step 102 (1) is placed horizontally in drying plant, and uses described drying to setIt is standby and under 80 DEG C~

    100 DEG C of temperature conditionss, the described coating spraying liquid being sprayed in crucible (1) inner bottom surface is dried,Obtain base coat (2);

    Step 2, polycrystalline silicon ingot casting;

    use polycrystalline silicon ingot or purifying furnace, and utilize the crucible (1) of band base coat (2) in step one to enterRow polycrystalline silicon ingot casting.

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