Handle substrates of composite substrates for semiconductors
First Claim
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1. A handle substrate of a composite substrate for a semiconductor;
- said handle substrate comprising a translucent ceramic,said handle substrate comprising a surface region on a side of a bonding face of said handle substrate, said surface region comprising pores having a size of 0.5 to 3.0 μ
m at an average density of 50 counts/mm2 or smaller, andsaid handle substrate comprising a region formed therein comprising pores having a size of 0.5 to 3.0 μ
m at an average density of 100 counts/mm2 or larger,wherein said translucent ceramic has an average grain size of 5 to 60 μ
m,wherein said translucent ceramic has a relative density of 98 percent or higher, andwherein a ratio of said average density of said pores in said surface region on a side of said bonding face to an average density of said pores in a region through which a central line of said substrate in a direction of thickness passes is 1;
2 to 1;
40.
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Abstract
A handle substrate 1 is made of a translucent ceramics. An average density of pores having a size of 0.5 to 3.0 μm included in a surface region 2A on the side of a bonding face 1a of the handle substrate 1 is 50 counts/mm2 or smaller. It is formed a region 3, whose average density of pores having a size of 0.5 to 3.0 μm is 100 counts/mm2 or larger, in the handle substrate 1. The translucent ceramics has an average grain size of 5 to 60 μm.
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11 Claims
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1. A handle substrate of a composite substrate for a semiconductor;
- said handle substrate comprising a translucent ceramic,
said handle substrate comprising a surface region on a side of a bonding face of said handle substrate, said surface region comprising pores having a size of 0.5 to 3.0 μ
m at an average density of 50 counts/mm2 or smaller, andsaid handle substrate comprising a region formed therein comprising pores having a size of 0.5 to 3.0 μ
m at an average density of 100 counts/mm2 or larger,wherein said translucent ceramic has an average grain size of 5 to 60 μ
m,wherein said translucent ceramic has a relative density of 98 percent or higher, and wherein a ratio of said average density of said pores in said surface region on a side of said bonding face to an average density of said pores in a region through which a central line of said substrate in a direction of thickness passes is 1;
2 to 1;
40. - View Dependent Claims (2, 3, 4, 5, 6)
- said handle substrate comprising a translucent ceramic,
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7. A handle substrate of a composite substrate for a semiconductor;
- said handle substrate comprising a translucent ceramic,
said handle substrate comprising a surface region on a side of a bonding face of said handle substrate, said surface region comprising pores having a size of 0.5 to 3.0 μ
m at an average density of 50 counts/mm2 or smaller, andsaid handle substrate comprising a region formed therein comprising pores having a size of 0.5 to 3.0 μ
m at an average density of 100 counts/mm2 or larger,wherein said translucent ceramic has an average grain size of 5 to 60 μ
m,wherein said translucent ceramic has a relative density of 98 percent or higher, wherein a microscopic central line average surface roughness Ra of said bonding face of said handle substrate is 3.0 nm or smaller, and wherein an in-line transmittance of a light having a wavelength of 650 nm is 60 percent or lower. - View Dependent Claims (8, 9, 10, 11)
- said handle substrate comprising a translucent ceramic,
Specification