US5429897A
Expired / Lapsed
US
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Attenuating type phase shifting mask and method of manufacturing thereof
Assignee: Renesas Electronics Corp
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Filing: 1994-02-10
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Granted: 1995-07-04
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Expires: 2014-02-10
Abstract
Abstract An attenuating type phase shifting mask according to the present invention includes an attenuating type phase shifting pattern, and an attenuating type auxiliary phase shifting pattern having a transmitting portion and a phase shifter portion formed at a predetermined position at the periphery of attenuating type phase shifting pattern, wherein attenuating type auxiliary phase shifting pattern includes a pattern having a resolution smaller than a limit of resolution of an exposure apparatus. Whereby, exposure of the region around a normal exposure region is prevented, and also exposure of the region adjacent to the exposure region is prevented when conducting exposure successively with a substrate moved.
Inventors
- 👤 Nobuyuki Yoshioka
- 👤 Junji Miyazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:32
CPC Classifications
G; G03; G03F; G03F1/00; G03F1/26; G03F1/32
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
73 words
An attenuating type phase shifting mask, comprising: an attenuating type phase shifting pattern formed at a predetermined position on a photomask substrate; and an attenuating type auxiliary phase shifting pattern including a transmitting portion and a phase shifter formed at a predetermined position at the periphery of said attenuating type phase shifting pattern, said attenuating type auxiliary phase shifting pattern having a resolution smaller than the limit of resolution of the exposure apparatus.
Claim 2
Dependent Claim
73 words
An attenuating type phase shifting mask, comprising: an attenuating type phase shifting pattern formed at a predetermined position on a photomask substrate; and an attenuating type auxiliary phase shifting pattern including a transmitting portion and a phase shifter formed at a predetermined position at the periphery of said attenuating type phase shifting pattern, said attenuating type auxiliary phase shifting pattern having a resolution smaller than the limit of resolution of the exposure apparatus.
Claim 3
Dependent Claim
109 words
The attenuating type phase shifting mask according to claim 1, wherein in said attenuating type auxiliary phase shifting pattern, values of (a) planar area of said transmitting portion, (b) planar area of said phase shifter, and (c) transmittance of said phase shifter are set such that the light intensity on the exposed material resulting from the light transmitting through said transmitting portion and the light intensity on the exposed material from the light transmitting through said phase shifter being canceled with each other to an extent that intensity is reduced to not more than 3% of the light intensity before transmitting through said transmitting portion and said phase shifter.
Claim 4
Dependent Claim
53 words
The attenuating type phase shifting mask according to claim 2, wherein ratio of planar area of said transmitting portion to planar area of said phase shifter represented as S O /S H of said attenuating type auxiliary phase shifting pattern is approximately equal to a value √T of transmittance of said phase shifter.
Claim 5
Dependent Claim
31 words
The attenuating type phase shifting mask according to claim 1, wherein said attenuating type auxiliary phase shifting pattern is provided at the entire periphery of said attenuating type phase shifting pattern.
Claim 6
Dependent Claim
45 words
The attenuating type phase shifting mask according to claim 1, wherein the shape of said attenuating type phase shifting pattern is rectangular, and said attenuating type auxiliary phase shifting pattern is provided in the vicinity of four corners of said attenuating type phase shifting pattern.
Claim 7
Dependent Claim
28 words
The attenuating type phase shifting mask according to claim 1, wherein the planar shape of said transmitting portion of said attenuating type auxiliary phase shifting pattern is rectangular.
Claim 8
Dependent Claim
31 words
The attenuating type phase shifting mask according to claim 1, wherein said transmitting portion and said phase shifter of said attenuating type auxiliary phase shifting pattern are linear and arranged alternately.
Claim 9
Independent Claim
127 words
A method of manufacturing an attenuating type phase shifting mask, comprising the steps of: forming an attenuating type phase shifter film having a light transmittance of 5-20% on a transparent substrate for shifting a phase of a transmitted light by 180°; forming on said attenuating type phase shifter film a resist film including an attenuating type phase shifting pattern region and an attenuating type auxiliary phase shifting pattern region formed at a predetermined position at the periphery of the attenuating type phase shifting pattern region; and patterning said attenuating type phase shifter film by etching using said resist film as a mask; wherein said attenuating type auxiliary phase shifting pattern region includes a pattern having a resolution smaller than a limit of resolution of an exposure apparatus.
Claim 10
Independent Claim
127 words
A method of manufacturing an attenuating type phase shifting mask, comprising the steps of: forming an attenuating type phase shifter film having a light transmittance of 5-20% on a transparent substrate for shifting a phase of a transmitted light by 180°; forming on said attenuating type phase shifter film a resist film including an attenuating type phase shifting pattern region and an attenuating type auxiliary phase shifting pattern region formed at a predetermined position at the periphery of the attenuating type phase shifting pattern region; and patterning said attenuating type phase shifter film by etching using said resist film as a mask; wherein said attenuating type auxiliary phase shifting pattern region includes a pattern having a resolution smaller than a limit of resolution of an exposure apparatus.
Claim 11
Dependent Claim
54 words
A method of manufacturing an attenuating type phase shifting mask according to claim 8, wherein said step of forming the attenuating type phase shifter film includes the steps of: forming a semi-light shielding film having a light transmittance of 5-20%; and forming a phase shifter film shifting a phase of transmitted light by 180°.
Claim 12
Dependent Claim
49 words
A method of manufacturing an attenuating type phase shifting mask according to claim 9, wherein said step of forming the semi-light shielding film includes the step of forming a chromium film, and said step of forming the phase shifter film includes the step of forming a silicon oxide film.
Claim 13
Dependent Claim
59 words
A method of manufacturing an attenuating type phase shifting mask according to claim 8, wherein said step of forming the attenuating type phase shifter film includes the step of forming a film of a kind selected from a group comprising chromium oxide, chromium nitride oxide, nitride carbide oxide of chromium, molybdenum silicide oxide, and nitride oxide of molybdenum silicide.
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