Semiconductor device formed using a catalyst element capable of promoting crystallization
First Claim
1. A semiconductor device comprising at least first and second thin film transistors formed over a substrate, each of said thin film transistors having a crystalline semiconductor film added with a catalyst for promoting a crystallization thereof, wherein a concentration of said catalyst in the semiconductor film of said first thin film transistor is different from that in the semiconductor film of the second thin film transistor.
0 Assignments
0 Petitions
Accused Products
Abstract
A semiconductor device using a crystalline semiconductor film is manufactured. The crystalline semiconductor film is formed by providing an amorphous silicon film with a catalyst metal for promoting a crystallization thereof and then heated for performing a thermal crystallization, following which the crystallized film is further exposed to a laser light for improving the crystallinity. The concentration of the catalyst metal in the semiconductor film and the location of the region to be added with the catalyst metal are so selected in order that a desired crystallinity and a desired crystal structure such as a vertical crystal growth or lateral crystal growth can be obtained. Further, active elements and driver elements of a circuit substrate for an active matrix type liquid crystal device are formed by such semiconductor devices having a desired crystallinity and crystal structure respectively.
-
Citations
17 Claims
- 1. A semiconductor device comprising at least first and second thin film transistors formed over a substrate, each of said thin film transistors having a crystalline semiconductor film added with a catalyst for promoting a crystallization thereof, wherein a concentration of said catalyst in the semiconductor film of said first thin film transistor is different from that in the semiconductor film of the second thin film transistor.
-
4. A semiconductor device comprising at least first and second thin film transistors formed over a substrate, each of said thin film transistors having a crystalline semiconductor film added with a catalyst for promoting a crystallization thereof,
wherein a concentration of said catalyst in the semiconductor film of said first thin film transistor is different from that in the semiconductor film of the second thin film transistor, and wherein the semiconductor film of said first transistor has crystals extending in a direction perpendicular to the substrate while the semiconductor film of said second transistor has crystals extending in a direction parallel with the substrate.
-
7. An electro-optical device comprising:
-
a substrate having an insulated surface; a peripheral circuit region having a first thin film transistor formed over said substrate, wherein said thin film transistor has a crystalline semiconductor film added with a catalyst for promoting a crystallization of said semiconductor film at a first concentration; and a pixel circuit region having a second thin film transistor formed over said substrate, wherein said thin film transistor has a crystalline semiconductor film added with a catalyst for promoting a crystallization of said semiconductor film at a second concentration which is different from said first concentration. - View Dependent Claims (8, 9, 10, 11, 12, 13)
-
-
14. An active matrix display device comprising:
-
a plurality of first thin film transistors arranged in a matrix form and formed on a substrate; and a driving circuit comprising second thin film transistors formed on said substrate, said driving circuit including at least one of a correction memory, an input-port, a memory and a CPU, wherein a channel region in both of said first and second thin film transistors comprises a crystallized semiconductor added with a catalyst element, which is capable of promoting crystallization of silicon. - View Dependent Claims (15)
-
-
16. An active matrix display device comprising:
- a plurality of first thin film transistors arranged in a matrix form and formed on a substrate; and
a driving circuit comprising second thin film transistors formed on said substrate, said driving circuit including at least one of a correction memory, an input-port, a memory and a CPU, wherein a channel region in both of said first and second thin film transistors comprises a crystallized semiconductor added with a catalyst element, which is capable of promoting crystallization of silicon, and wherein the channel region in the second thin film transistor has a crystalline structure in which crystals extend in a direction parallel with a surface of said substrate.
- a plurality of first thin film transistors arranged in a matrix form and formed on a substrate; and
-
17. An active matrix display device comprising:
-
a plurality of first thin film transistors arranged in a matrix form and formed on a substrate; and a driving circuit comprising second thin film transistors formed on said substrate, said driving circuit including at least one of a correction memory, an input-port, a memory and a CPU, wherein a channel region in both of said first and second thin film transistors comprises a crystallized semiconductor added with a catalyst element, which is capable of promoting crystallization of silicon, and wherein the channel region in the second thin film transistor has a crystalline structure in which crystals extend in a direction perpendicular to a surface of said substrate.
-
Specification