Integrated circuit devices having buffer layers therein which contain metal oxide stabilized by heat treatment under low temperature
First Claim
1. An integrated circuit capacitor, comprising:
- a first capacitor electrode;
a first high dielectric layer on said first capacitor electrode;
a second capacitor electrode on said first high dielectric layer, opposite said first capacitor electrode;
an electrically insulating layer on said first high dielectric layer; and
an aluminum oxide buffer layer formed by atomic layer deposition and stabilized by heat treatment at a temperature in a range between about 350°
C. and 600°
C., extending between said first high dielectric layer and said electrically insulating layer.
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Accused Products
Abstract
Integrated circuit devices include a first dielectric layer, an electrically insulating layer on the first dielectric layer and an an aluminum oxide buffer layer formed by atomic layer deposition (ALD) and stabilized by heat treatment at a temperature of less than about 600° C., between the first dielectric layer and the electrically insulating layer. The first dielectric layer may comprise a high dielectric material such as a ferroelectric or paraelectric material. The electrically insulating layer may also comprise a material selected from the group consisting of silicon dioxide, borophosphosilicate glass (BPSG) and phosphosilicate glass (PSG). To provide a preferred integrated circuit capacitor, a substrate may be provided and an interlayer dielectric layer may be provided on the substrate. Here, a metal layer may also be provided between the interlayer dielectric layer and the first dielectric layer. The metal layer may comprise a material selected from the group consisting of Pt, Ru, Ir, and Pd.
440 Citations
17 Claims
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1. An integrated circuit capacitor, comprising:
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a first capacitor electrode; a first high dielectric layer on said first capacitor electrode; a second capacitor electrode on said first high dielectric layer, opposite said first capacitor electrode; an electrically insulating layer on said first high dielectric layer; and an aluminum oxide buffer layer formed by atomic layer deposition and stabilized by heat treatment at a temperature in a range between about 350°
C. and 600°
C., extending between said first high dielectric layer and said electrically insulating layer. - View Dependent Claims (2, 3, 4, 5)
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6. An integrated circuit capacitor, comprising:
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a first electrically insulating layer; a first metal layer pattern on said first electrically insulating layer; a first high dielectric layer on said first metal layer pattern, opposite said first electrically insulating layer; a second metal layer pattern on said first high dielectric layer, opposite said first metal layer pattern; an aluminum oxide buffer layer formed by atomic layer deposition and stabilized by heat treatment at a temperature in a range between about 350°
C. and 600°
C., on exposed surfaces of said first metal layer pattern, said first high dielectric layer and said second metal layer pattern; anda second electrically insulating layer on said buffer layer. - View Dependent Claims (7, 8, 9)
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10. An integrated circuit capacitor, comprising:
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a semiconductor substrate; a first capacitor electrode on said semiconductor substrate and electrically connected thereto; a capacitor dielectric layer on said first capacitor electrode; a second capacitor electrode on said capacitor dielectric layer, opposite said first capacitor electrode; an aluminum oxide layer formed by atomic layer deposition on said second capacitor electrode, said aluminum oxide layer stabilized by heat treatment at a temperature in a range between about 350°
C. and 600°
C.; anda first conductive layer pattern formed on said aluminum oxide layer.
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11. An integrated circuit capacitor, comprising:
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a semiconductor substrate; a first capacitor electrode on said semiconductor substrate and electrically connected thereto; a capacitor dielectric layer on said first capacitor electrode; a second capacitor electrode on said capacitor dielectric layer, opposite said first capacitor electrode; an aluminum oxide buffer layer formed by atomic layer deposition on said second capacitor electrode, said aluminum oxide buffer layer stabilized by heat treatment at a temperature in a range between about 350°
C. and 600°
C.; anda first conductive layer pattern formed on said aluminum oxide buffer layer.
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12. The capacitor of 11, wherein said aluminum oxide buffer layer has a thickness in a range between about 10 and 250 Å
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13. The capacitor of 11, wherein said aluminum oxide buffer layer is formed by atomic layer deposition at a temperature in a range between about 250 and 450°
- C.
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14. An integrated circuit capacitor, comprising:
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a first electrically insulating layer; a first metal layer pattern on said first electrically insulating layer; a first high dielectric layer on exposed surfaces of said first metal layer pattern and on said first electrically insulating layer, said first high dielectric layer being patterned in cell block units; a second metal layer on said first high dielectric layer, opposite said first metal layer pattern, said second metal layer being patterned in cell block units simultaneously with said first high dielectric layer; an aluminum oxide buffer layer formed by atomic layer deposition and stabilized by heat treatment at a temperature in a range between about 350°
C. and 600°
C., on said second metal layer; anda second electrically insulating layer on said buffer layer. - View Dependent Claims (15)
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16. An integrated circuit capacitor, comprising:
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lower and upper capacitor electrodes; a capacitor dielectric layer extending between said lower and upper capacitor electrodes; an aluminum oxide buffer layer on an upper surface of said upper capacitor electrode, said aluminum oxide buffer layer formed by atomic layer deposition and stabilized by heat treatment at a temperature in a range between about 350°
C. and 600°
C. - View Dependent Claims (17)
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Specification