Process for production of semiconductor substrate
First Claim
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1. A process for producing a semiconductor substrate comprising steps of:
- forming a nonporous monocrystalline semiconductor layer on a porous layer of a first substrate having the porous layer;
bonding the nonporous monocrystalline layer onto a second substrate;
separating the bonded substrates at the porous layer;
removing the porous layer on the second substrate; and
removing the porous layer constituting the first substrate.
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Abstract
A method for making a thin film semiconductor. The method includes the steps of making a semiconductor substrate having one or more layers of different porosity, and subsequently separating the layers along a line of relative weakness. This method is particularly well adapted to manufacturing Silicon-on-Insulator (SOI) structures.
162 Citations
73 Claims
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1. A process for producing a semiconductor substrate comprising steps of:
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forming a nonporous monocrystalline semiconductor layer on a porous layer of a first substrate having the porous layer;
bonding the nonporous monocrystalline layer onto a second substrate;
separating the bonded substrates at the porous layer;
removing the porous layer on the second substrate; and
removing the porous layer constituting the first substrate. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 14, 15, 16, 17, 18, 19, 20, 21)
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2. A process for producing a semiconductor substrate, comprising steps of:
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forming a nonporous monocrystalline semiconductor layer on a porous layer of a first substrate having the porous layer;
bonding the nonporous monocrystalline layer onto a second substrate with interposition of an insulative layer;
separating the bonded substrates at the porous layer;
removing the porous layer on the second substrate; and
removing the porous layer constituting the first substrate. - View Dependent Claims (12, 13)
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22. A semiconductor substrate producing method comprising:
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a porous-forming step for forming a porous Si layer on at least a surface of an Si substrate; and
a large porosity layer forming step for forming large porosity layer at a constant depth from a surface of said porous Si in said porous Si layer. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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47. A semiconductor substrate comprising:
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a porous Si layer formed at a surface layer of an Si substrate; and
a large porosity layer formed in said porous Si layer wherein said large porosity layer exists in a region located at a constant depth from a surface of said porous Si layer. - View Dependent Claims (48)
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49. A fabrication process of semiconductor substrate comprising:
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a step of bonding a principal surface of a first substrate to a principal surface of a second substrate, said first substrate being an Si substrate in which at least one layer of non-porous thin film is formed through a porous Si layer;
a step of exposing said porous Si layer in a side surface of a bonding substrate comprised of said first substrate and said second substrate;
a step of dividing said bonding substrate in said porous Si layer by oxidizing said bonding substrate; and
a step of removing a porous Si and oxidized porous Si layer on said second substrate separated by the division of said bonding substrate in said porous Si layer. - View Dependent Claims (51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73)
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50. A fabrication process of semiconductor substrate comprising:
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a step of bonding a principal surface of a first substrate to a principal surface of a second substrate, said first substrate being an Si substrate in which at least one layer of non-porous thin film is formed through a porous Si layer and in which said porous Si layer is exposed in a side surface thereof;
a step of dividing said bonding substrate in said porous Si layer by oxidizing a bonding substrate comprised of said first substrate and said second substrate; and
a step of removing a porous Si and oxidized porous Si layer on said second substrate separated by the division of said bonding substrate in said porous Si layer.
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Specification