Semiconductor device, semiconductor element and method for producing same
First Claim
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1. A semiconductor device comprising:
- a semiconductor substrate;
a plurality of first diffusion layers having a low impurity density, said first diffusion layers being formed on the surface of said semiconductor substrate;
a plurality of second diffusion layers having a high impurity density, said second diffusion layers being formed on the surface of said semiconductor substrate;
a plurality of first contacts, each of which contacts said first diffusion layers and each of which is formed of a semiconductor; and
a plurality of second contacts, each of which contacts said second diffusion layers and each of which is formed of a metal.
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Abstract
A semiconductor device comprises: a semiconductor substrate; a plurality of first diffusion layers having a low impurity density, the first diffusion layers being formed on the surface of the semiconductor substrate; a plurality of second diffusion layers having a high impurity density, the second diffusion layers being formed on the surface of the semiconductor substrate; a plurality of first contacts, each of which contacts the first diffusion layers and each of which is formed of a semiconductor; and a plurality of second contacts, each of which contacts the second diffusion layers and each of which is formed of a metal.
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Citations
27 Claims
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1. A semiconductor device comprising:
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a semiconductor substrate;
a plurality of first diffusion layers having a low impurity density, said first diffusion layers being formed on the surface of said semiconductor substrate;
a plurality of second diffusion layers having a high impurity density, said second diffusion layers being formed on the surface of said semiconductor substrate;
a plurality of first contacts, each of which contacts said first diffusion layers and each of which is formed of a semiconductor; and
a plurality of second contacts, each of which contacts said second diffusion layers and each of which is formed of a metal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for producing a semiconductor device having a semiconductor filled contact or a metal filled contact for a plurality of diffusion layers, said method comprising the steps of:
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forming a plurality of contact holes;
filling a semiconductor in each of said first contact holes;
carrying out a thermal treatment;
forming a plurality of second contact holes; and
filling a metal in each of said second contact holes. - View Dependent Claims (8, 9, 10)
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11. A semiconductor device comprising:
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a memory cell part having a plurality of non-volatile memory cells, each of which has a floating gate electrode, a control gate and an insulating film arranged therebetween;
a peripheral circuit having a plurality of peripheral transistors each having a gate electrode made of the material of said floating gate electrode;
a plurality of cell gate contacts, each of which contacts a corresponding one of said control gate electrodes for activating a corresponding one of said memory cells; and
a plurality of peripheral gate contacts, each of which contacts a corresponding one of said floating gate electrodes for activating a corresponding one of said peripheral circuits, each of said peripheral gate contacts being electrically connected to both of said corresponding one of said floating gate electrodes and said corresponding one of said control gate electrodes. - View Dependent Claims (12, 13, 14)
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15. A method for producing a semiconductor device which comprises a memory cell part having a plurality of non-volatile memory cells, each of which has a floating gate electrode, a control gate and an insulating film arranged therebetween;
- a peripheral circuit having a plurality of peripheral transistors each having a gate electrode made of the material of said floating gate electrode;
a plurality of cell gate contacts, each of which contacts a corresponding one of said control gate electrodes for activating a corresponding one of said memory cells; and
a plurality of peripheral gate contacts, each of which contacts a corresponding one of said floating gate electrodes for activating a corresponding one of said peripheral circuits, each of said peripheral gate contacts being electrically connected to both of said corresponding one of said floating gate electrodes and said corresponding one of said control gate electrodes, said method comprising the steps of;
simultaneously etching said floating gate electrodes and said insulating films to form contact holes; and
filling a contact material in said contact holes to form said peripheral gate contacts. - View Dependent Claims (16)
- a peripheral circuit having a plurality of peripheral transistors each having a gate electrode made of the material of said floating gate electrode;
- 17. A semiconductor device comprising a memory cell array including memory transistors having a double-layer gate structure, and select gate transistors serving as gates for transmitting and receiving data to and from said memory transistors, wherein contacts with the gate electrodes of said select gate transistors are formed of a polysilicon.
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20. A semiconductor high resistive element formed in a semiconductor substrate, in said substrate double-layer electrode type transistors are formed by sequentially forming at least four layers of a first gate insulating film, a first gate electrode, a second gate insulating film and a second gate electrode,
wherein a pair of contact holes are formed in at least a material layer of said second gate electrode and a material layer of said second gate insulating film of said four layers at regular intervals, a wiring material is filled in each of said pair of contact holes so as to be electrically connected to a material layer of said first gate electrode, and an insulating material is arranged on an inner surface of each of said pair of contact holes to electrically isolate said wiring material from said material layer of said second gate electrode, so that said material layer of said first gate electrode is used as a resistive material.
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21. A semiconductor high resistive element formed in a semiconductor substrate, in said substrate double-layer electrode type transistors are formed by sequentially forming at least four layers of a first gate insulating film, a first gate electrode, a second gate insulating film and a second gate electrode,
wherein a pair of contact holes are formed in at least a material layer of said second gate electrode and a material layer of said second gate insulating film of said four layers at regular intervals, a wiring material is filled in each of said pair of contact holes so as to be electrically connected to a material layer of said first gate electrode, and said material layer of said second gate electrode is electrically cut at least one place between said pair of contact holes, so that said material layer of said first gate electrode is used as a resistive material.
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22. A method for producing a semiconductor element in a semiconductor substrate, in said substrate double-layer electrode type transistors are by sequentially forming at least four layers of a first gate insulating film, a first gate electrode, a second gate insulating film and a second gate electrode on said semiconductor substrate, said method comprising the steps of:
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forming an insulating film in a specific region on said semiconductor substrate;
sequentially forming three layers of a material layer of said first gate electrode, a material layer of said second gate insulating film, and a material layer of said second gate electrode, on said insulating film;
etching said material layer of said second gate electrode and said material layer of said gate insulating layer to form at least a pair of contact holes for exposing said material layer of said first gate electrode functioning as a resistive element material;
selectively forming another insulating film on side walls of said contact holes; and
filling a wiring material in said contact holes so that said wiring material is electrically insulated from said material layer of said second gate electrode by said another insulating film although said wiring material is electrically conducted to said material layer of said first gate electrode. - View Dependent Claims (23, 24)
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25. A method for producing a semiconductor element in a semiconductor substrate, in said substrate double-layer electrode type transistors are by sequentially forming at least four layers of a first gate insulating film, a first gate electrode, a second gate insulating film and a second gate electrode on said semiconductor substrate, said method comprising the steps of:
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forming an insulating film in a specific region on said semiconductor substrate;
sequentially forming three layers of a material layer of said first gate electrode, a material layer of said second gate insulating film, and a material layer of said second gate electrode, on said insulating film;
etching, removing and cutting said material layer of said second gate electrode between a pair of contact hole intended regions to form a cut portion;
etching said material layer of said second gate electrode and said material layer of said gate insulating layer to form at least a pair of contact holes for exposing said material layer of said first gate electrode functioning as a resistive element material; and
filling a wiring material in said contact holes so that said wiring material is electrically conducted to said material layer of said first gate electrode. - View Dependent Claims (26, 27)
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Specification