Semiconductor thin film formed on a supporting substrate
First Claim
1. A semiconductor substrate comprising:
- a single crystal semiconductor thin film layer having an element region which includes at least a portion of a first surface thereof;
an element smoothing layer formed on the element region of the single crystal semiconductor thin film layer; and
a supporting substrate laminated to the element smoothing layer by a resin adhesive layer such that a rough surface formed by a circuit element formed on the first surface of the single crystal semiconductor thin film layer is smoothed by the element smoothing layer to avoid separation of the semiconductor thin film layer and the supporting substrate.
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Accused Products
Abstract
A semiconductor substrate is provided which has a semiconductor on insulator structure but in which can be formed a thin film integrated circuit having electrical characteristics and microstructure equal to or of greater density than a silicon integrated circuit formed using a bulk single crystal silicon wafer. The semiconductor substrate has a structure which is formed of a sequentially layered single crystal silicon thin film sandwiched between a thermally oxidized silicon film and a silicon oxide or silicon nitride film, an element smoothing layer, a fluoro-epoxy series resin adhesive layer, and a supporting substrate. The single crystal silicon thin film can have integrated circuit devices formed in a sub-micron geometry similar to that of a bulk single crystal silicon. A transparent glass or a bulk single crystal silicon wafer can be used as a supporting substrate. Therefore the semiconductor thin film can integrate a highly fine, dense and compact semiconductor integrated circuit or semiconductor optical element. The semiconductor thin film element has a transparent optical detection region or optical modulation region with 100 million pixels or more.
185 Citations
49 Claims
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1. A semiconductor substrate comprising:
- a single crystal semiconductor thin film layer having an element region which includes at least a portion of a first surface thereof;
an element smoothing layer formed on the element region of the single crystal semiconductor thin film layer; and
a supporting substrate laminated to the element smoothing layer by a resin adhesive layer such that a rough surface formed by a circuit element formed on the first surface of the single crystal semiconductor thin film layer is smoothed by the element smoothing layer to avoid separation of the semiconductor thin film layer and the supporting substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 40, 41)
- a single crystal semiconductor thin film layer having an element region which includes at least a portion of a first surface thereof;
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17. A liquid crystal light valve comprising:
- a drive substrate having a drive electrode and a drive circuit for electrically exciting the drive electrode;
an opposite substrate opposing the drive substrate; and
a liquid crystal layer formed between the drive substrate and the opposite substrate;
wherein the drive substrate comprises a single crystal semiconductor thin film layer, an element smoothing layer formed on the single crystal semiconductor thin film layer, a supporting substrate laminated on the element smoothing layer by a resin adhesive layer and a semiconductor circuit element formed in a surface of the single crystal semiconductor thin film layer contacting the element smoothing layer, such that the element smoothing layer is effective to smooth a rough surface formed by the semiconductor circuit element to avoid separation of the semiconductor thin film layer and the supporting substrate; and
wherein the drive circuit comprised of the semiconductor circuit element and the drive electrode is arranged integrally on the single crystal semiconductor thin film layer, whereby an optical transmittance through the light valve is controlled by applying a voltage across the liquid crystal layer when the drive electrode is electrically excited by the drive circuit. - View Dependent Claims (18, 19)
- a drive substrate having a drive electrode and a drive circuit for electrically exciting the drive electrode;
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20. A semiconductor optical detector comprising:
- a semiconductor optical detecting element; and
a drive electrode connected to and exciting the semiconductor optical detecting element in accordance with a predetermined signal;
wherein the semiconductor optical detecting element and the drive electrode are formed in a drive substrate comprising a single crystal semiconductor thin film bonded to a supporting substrate;
the semiconductor optical detecting element being formed in the single crystal semiconductor thin film, and the drive electrode being formed integrally on the single crystal semiconductor thin film, whereby an optical detection signal is controlled by activating the optical detecting element when the drive electrode is excited by a drive circuit. - View Dependent Claims (21)
- a semiconductor optical detecting element; and
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22. A semiconductor substrate comprising:
- a semiconductor thin film having a first device region;
a smoothing layer formed on the semiconductor thin film and contacting the first device region to smooth a rough surface formed by a circuit element formed in the first device region; and
a supporting substrate laminated to the smoothing layer by an adhesive layer such that separation of the semiconductor thin film and the supporting substrate is prevented by the smoothing layer. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
- a semiconductor thin film having a first device region;
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42. A semiconductor substrate comprising:
- a first semiconductor thin film layer having a first element region which includes at least a portion of a first surface thereof;
a first element smoothing layer formed over the first element region;
a second semiconductor thin film layer having a second element region which includes at least a portion of a first surface thereof;
a second element smoothing layer formed over the second element region;
a first adhesive film layer for bonding the first semiconductor thin film layer and the first element smoothing layer to the second semiconductor thin film layer and the second element smoothing layer to form a multilayer circuit; and
a supporting substrate bonded to the multilayer circuit by a second adhesive layer;
wherein the first element smoothing layer is effective to smooth a rough surface formed by a circuit element formed in the first element region of the first semiconductor thin film, and the second element smoothing layer is effective to smooth a rough surface formed by a circuit element formed in the second element region of the second semiconductor thin film to thereby avoid separation of the first and second semiconductor thin film layers and the supporting substrate.
- a first semiconductor thin film layer having a first element region which includes at least a portion of a first surface thereof;
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43. A semiconductor substrate comprising:
- a semiconductor thin film layer having a first element region which includes at least a first surface thereof;
a first element smoothing layer formed on the first element region;
a supporting substrate for supporting the semiconductor thin film layer; and
an adhesive layer for bonding the supporting substrate and the semiconductor thin film layer on the side having the first element smoothing layer;
wherein the first element smoothing layer is effective to smooth a rough surface caused by a circuit element formed in the first element region to avoid separation of the semiconductor thin film layer and the supporting substrate. - View Dependent Claims (44, 45, 46, 47, 48, 49)
- a semiconductor thin film layer having a first element region which includes at least a first surface thereof;
Specification