Patent ID: 7909931
Filing Date: 2011-03-22
Classification: C30B,Y10S,Y10T

Abstract:
1. A silica glass crucible having a container shape, comprising: a transparent layer located at an inner periphery of the crucible, an opaque layer having a large number of bubbles located at an outer periphery of the crucible, wherein the crucible is configured such that a polycrystalline silicon material is filled up in an internal space of the container, heated, and melted so that a silicon melt is accommodated, and a silicon single crystal is manufactured by the Czochralski method, a first substantially bubble-free layer having a thickness of 100 μm-450 μm located at an inner periphery side of an initial melt line zone, which has a height of 10 mm-30 mm, a bubble-containing layer having a thickness of 100 μm or more and including bubbles with an average diameter of 20 μm-60 μm, wherein the bubble-containing layer is located outside said first substantially bubble-free layer, and said transparent layer and said opaque layer are further located outside said bubble-containing layer, and a second substantially bubble-free layer having a thickness of 300 μm or more located on the inner periphery side in a region lower than said initial melt line zone, wherein said transparent layer and said opaque layer are further formed outside said second substantially bubble-free layer.