Method for forming pattern using a photomask
First Claim
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1. A method for forming a pattern that uses a photomask, comprising the steps of:
- a) forming a resist film on a substrate;
b) irradiating the resist film with the exposure light via the photomask; and
c) developing the resist film irradiated with the exposure light so as to pattern the resist film,wherein the photomask comprises on a transparent substrate;
a semi-light-shielding portion having a light-shielding property with respect to the exposure light;
a light-transmitting portion surrounded by the semi-light-shielding portion and having a light-transmitting property with respect to the exposure light; and
a peripheral portion surrounded by the semi-light-shielding portion and positioned in a periphery of the light-transmitting portion,the semi-light-shielding portion and the light-transmitting portion transmit the exposure light in a same phase,the peripheral portion transmits the exposure light in a phase opposite to that of the semi-light-shielding portion and the light-transmitting portion, and is spaced apart from the light-transmitting portion by a predetermined distance,a surface of the transparent substrate in a formation region for the light-transmitting portion is exposed,a first phase shift film that transmits the exposure light in a phase opposite to that of the light-transmitting portion is formed on the transparent substrate in a formation region for the peripheral portion,the first phase shift film and a second phase shift film that transmits the exposure light in a phase opposite to that of the light-transmitting portion are laminated sequentially on the transparent substrate in a formation region for the semi-light-shielding portion, anda multilayered structure of the first phase shift film and the second phase shift film has a transmittance that allows the exposure light to be transmitted partially and transmits the exposure light in a same phase as that of the light-transmitting portion.
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Abstract
A photomask has a semi-light-shielding portion having a light-shielding property and a light-transmitting portion surrounded by the semi-light-shielding portion, and a peripheral portion positioned in the periphery of the light-transmitting portion. The semi-light-shielding portion and the light-transmitting portion transmit exposure light in the same phase, whereas the peripheral portion transmits exposure light in a phase opposite to that of the light-transmitting portion.
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Citations
31 Claims
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1. A method for forming a pattern that uses a photomask, comprising the steps of:
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a) forming a resist film on a substrate; b) irradiating the resist film with the exposure light via the photomask; and c) developing the resist film irradiated with the exposure light so as to pattern the resist film, wherein the photomask comprises on a transparent substrate; a semi-light-shielding portion having a light-shielding property with respect to the exposure light; a light-transmitting portion surrounded by the semi-light-shielding portion and having a light-transmitting property with respect to the exposure light; and a peripheral portion surrounded by the semi-light-shielding portion and positioned in a periphery of the light-transmitting portion, the semi-light-shielding portion and the light-transmitting portion transmit the exposure light in a same phase, the peripheral portion transmits the exposure light in a phase opposite to that of the semi-light-shielding portion and the light-transmitting portion, and is spaced apart from the light-transmitting portion by a predetermined distance, a surface of the transparent substrate in a formation region for the light-transmitting portion is exposed, a first phase shift film that transmits the exposure light in a phase opposite to that of the light-transmitting portion is formed on the transparent substrate in a formation region for the peripheral portion, the first phase shift film and a second phase shift film that transmits the exposure light in a phase opposite to that of the light-transmitting portion are laminated sequentially on the transparent substrate in a formation region for the semi-light-shielding portion, and a multilayered structure of the first phase shift film and the second phase shift film has a transmittance that allows the exposure light to be transmitted partially and transmits the exposure light in a same phase as that of the light-transmitting portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 28)
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8. A method for forming a pattern that uses a photomask, comprising the steps of:
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a) forming a resist film on a substrate; b) irradiating the resist film with the exposure light via the photomask; and c) developing the resist film irradiated with the exposure light so as to pattern the resist film, wherein the photomask comprises on a transparent substrate; a semi-light-shielding portion having a light-shielding property with respect to the exposure light; a light-transmitting portion surrounded by the semi-light-shielding portion and having a light-transmitting property with respect to the exposure light; and a peripheral portion surrounded by the semi-light-shielding portion and positioned in a periphery of the light-transmitting portion, the semi-light-shielding portion and the light-transmitting portion transmit the exposure light in a same phase, the peripheral portion transmits the exposure light in a phase opposite to that of the semi-light-shielding portion and the light-transmitting portion, and is spaced apart from the light-transmitting portion by a predetermined distance, a surface of the transparent substrate in a formation region for the light-transmitting portion is exposed, a semi-light-shielding film that has a transmittance allowing the exposure light to be transmitted partially and transmits the exposure light in a same phase as that of the light-transmitting portion is formed on the transparent substrate in the semi-light-shielding portion formation region, and the semi-light-shielding film with a reduced thickness is formed on the transparent substrate in a formation region for the peripheral portion, the thickness being such an extent that the exposure light is transmitted in a phase opposite to that of the light-transmitting portion. - View Dependent Claims (9, 10, 11, 12, 13, 29)
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14. A method for forming a pattern that uses a photomask, comprising the steps of:
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a) forming a resist film on a substrate; b) irradiating the resist film with the exposure light via the photomask; and c) developing the resist film irradiated with the exposure light so as to pattern the resist film, wherein the photomask comprises on a transparent substrate; a semi-light-shielding portion having a light-shielding property with respect to the exposure light; a light-transmitting portion surrounded by the semi-light-shielding portion and having a light-transmitting property with respect to the exposure light; and a peripheral portion surrounded by the semi-light-shielding portion and positioned in a periphery of the light-transmitting portion, the semi-light-shielding portion and the light-transmitting portion transmit the exposure light in a same phase, the peripheral portion transmits the exposure light in a phase opposite to that of the semi-light-shielding portion and the light-transmitting portion, a surface of the transparent substrate in a formation region for the light-transmitting portion is exposed, a semi-light-shielding film that has a transmittance that allows the exposure light to be transmitted partially and transmits the exposure light in a same phase as that of the light-transmitting portion is formed on the transparent substrate in the semi-light-shielding portion, and the transparent substrate in a formation region for the peripheral portion is dug down such that a thickness thereof is such an extent that the exposure light is transmitted in a phase opposite to that of the light-transmitting portion. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 30)
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23. A method for forming a pattern that uses a photomask, comprising the steps of:
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a) forming a resist film on a substrate; b) irradiating the resist film with the exposure light via the photomask; and c) developing the resist film irradiated with the exposure light so as to pattern the resist film, wherein the photomask comprises on a transparent substrate; a semi-light-shielding portion having a light-shielding property with respect to the exposure light; a light-transmitting portion surrounded by the semi-light-shielding portion and having a light-transmitting property with respect to the exposure light; and a peripheral portion surrounded by the semi-light-shielding portion and positioned in a periphery of the light-transmitting portion, the light-transmitting portion has a polygonal shape, the peripheral portion is composed of a plurality of rectangular regions, each region being positioned so as to face each side of the light-transmitting portion, the semi-light-shielding portion and the light-transmitting portion transmit the exposure light in a same phase, the peripheral portion transmits the exposure light in a phase opposite to that of the semi-light-shielding portion and the light-transmitting portion, a surface of the transparent substrate in a formation region for the light-transmitting portion is exposed, a first phase shift film that transmits the exposure light in a phase opposite to that of the light-transmitting portion is formed on the transparent substrate in a formation region for the peripheral portion, the first phase shift film and a second phase shift film that transmits the exposure light in a phase opposite to that of the light-transmitting portion are laminated sequentially on the transparent substrate in a formation region for the semi-light-shielding portion, and a multilayered structure of the first phase shift film and the second phase shift film has a transmittance that allows the exposure light to be transmitted partially and transmits the exposure light in a same phase as that of the light-transmitting portion. - View Dependent Claims (24, 25, 26, 27, 31)
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Specification