METHODS FOR FABRICATING A SEMICONDUCTOR DEVICE AND SEMICONDUCTOR DEVICES FABRICATED BY THE SAME
First Claim
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1. A method for fabricating a semiconductor device, the method comprising:
- sequentially forming an etch target layer, a lower mold layer, and an intermediate mold layer on a substrate, the etch target layer including a separation region;
forming first mold patterns on the intermediate mold layer;
forming first spacers on sidewalls of the first mold patterns;
etching the intermediate mold layer using the first spacers as etch masks to form second mold patterns;
forming second spacers on sidewalls of the second mold patterns;
etching the lower mold layer using the second spacers as etch masks to form third mold patterns;
forming a fourth mold pattern that at least partially covers at least one of the third mold patterns, the fourth mold pattern vertically overlapping the separation region;
etching the etch target layer using the fourth mold pattern and ones of the third mold patterns that are exposed by the fourth mold pattern as etch masks to form insulating patterns; and
forming conductive lines in spaces between the insulating patterns.
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Abstract
The inventive concepts provide methods for fabricating a semiconductor device and semiconductor devices fabricated by the same. According to the method, conductive lines having a fine pitch smaller than the minimum pitch realized by an exposure process may be formed using two or three photolithography processes and two spacer formation processes. In addition, node separation regions of the conductive lines may be easily formed without a misalignment problem.
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Citations
54 Claims
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1. A method for fabricating a semiconductor device, the method comprising:
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sequentially forming an etch target layer, a lower mold layer, and an intermediate mold layer on a substrate, the etch target layer including a separation region; forming first mold patterns on the intermediate mold layer; forming first spacers on sidewalls of the first mold patterns; etching the intermediate mold layer using the first spacers as etch masks to form second mold patterns; forming second spacers on sidewalls of the second mold patterns; etching the lower mold layer using the second spacers as etch masks to form third mold patterns; forming a fourth mold pattern that at least partially covers at least one of the third mold patterns, the fourth mold pattern vertically overlapping the separation region; etching the etch target layer using the fourth mold pattern and ones of the third mold patterns that are exposed by the fourth mold pattern as etch masks to form insulating patterns; and forming conductive lines in spaces between the insulating patterns. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18-50. -50. (canceled)
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51. A method for fabricating a semiconductor device, the method comprising:
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forming an etch target layer on a substrate, the etch target layer including a separation region; forming a lower mold layer on the etch target layer opposite the substrate; forming an intermediate mold layer on the lower mold layer opposite the etch target layer; forming first mold patterns on the intermediate mold layer; forming first spacers on sidewalls of the first mold patterns, wherein a first of the first spacers that is on a sidewall of a first of the first mold patterns has a maximum width that is about one third a maximum width of the first of the first mold patterns; etching the intermediate mold layer using the first spacers as etch masks to form second mold patterns, wherein a first of the second mold patterns has a width that is substantially equal to the maximum width of the first of the first spacers; forming second spacers on sidewalls of the second mold patterns, wherein a first of the second spacers has a width that is substantially equal to the maximum width of the first of the first spacers; etching the lower mold layer using at least the second spacers as etch masks to form third mold patterns; etching the etch target layer using at least some of the third mold patterns as etch masks to form etch target layer patterns; and forming conductive lines in spaces between the etch target layer patterns. - View Dependent Claims (52, 53)
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54-57. -57. (canceled)
Specification