Ulvac Coating Corporation

Other

Mitsubishi Denki Kabushiki Kaisha

Renesas Technology Corp.

Mitsubishi Electric Corporation

Dai Nippon Printing Co., Ltd.

Mitsubishi Electric Company

Ulcoat (ulvac Coating Corporation)

Susumu Kawada

Nobuyuki Yoshioka

Akihiko Isao

Tsuneo Yamamoto

Kazuyuki Maetoko

Atsushi Hayashi

Junji Miyazaki

Ryoichi Kobayashi

Akira Chiba

Jun Amano

Yoshihiro Saito

Shuichiro Kanai

In the formation of a halftone type phase shift mask, a reactive gas introduction inlet and an inert gas introduction inlet are provided so as to introduce the respective gases separately and by using a reactive low throw sputtering method a molybdenum silicide based phase shifter film is formed. Thereby, it becomes possible to provide a halftone type phase shift mask, which is applicable to an ArF laser or to a KrF laser, by using molybdenum silicide based materials.

Phase shifter film and process for the same

A uniform thin phase-shifting photomask blank can be formed by depositing a thin film on a substrate by a reactive sputtering technique while passing, at least four times, the substrate over a sputtering target. In the formation of the blank, NO gas is used as the reactive gas, a target composed of a mixture of molybdenum and silicon is used as the sputtering target and a transparent substrate is used as the thin film-forming substrate to form, on the transparent substrate, a light-transmitting film capable of transmitting light rays having an intensity, which cannot substantially contribute to the exposure. In addition, the film is formed, on the substrate, through an opening having a sufficiently enlarged length along the substrate-conveying direction so that even regions whose deposition rate of the target component is not more than 90% of the maximum level thereof also contribute to the film-formation. The phase-shifting photomask blank thus prepared is subjected to a patterning treatment to form a phase-shifting photomask.

Phase-shifting photomask blank, phase-shifting photomask, method for producing them and apparatus for manufacturing the blank

A phase-shift photo mask blank comprises a half tone phase-shift film, wherein the half tone phase-shift film consists of at least two layers and in the case of two layers, the refractive index of the upper layer of the film is smaller than that of the lower layer thereof; in the case of three layers, the refractive index of the intermediate layer is smaller than those observed for the upper and lower layers or the refractive index of the upper layer is smaller than that of an intermediate layer; in the case of at least 4 layers, the refractive index of the upper most layer is smaller than that of the layer immediately below the upper most layer. The photo mask blank permits the production of a phase-shift photo mask having a high transmittance at an exposure wavelength and a low reflectance as well as a low transmittance at a defect-inspection wavelength. The photo mask in turn permits the fabrication of a semiconductor device having a fine pattern.

Phase-shift photo mask blank, phase-shift photo mask and method for fabricating semiconductor devices

A phase-shifting photomask blank is made by sputtering a target of molybdenum suicide with a sputtering gas to which nitric monoxide is added in a ratio of 2.65-6.47% by volume. A nitrided-oxide film of molybdenum silicide as a phase-shifting film is formed on a transparent substrate. A base phase-shifting film may be formed on a transparent substrate and then a nitrided-oxide film of molybdenum silicide as a surface layer may be formed on top of the base phase-shifting film by sputtering a target of molybdenum silicide with a sputtering gas to which nitric monoxide is added in a ratio of 0.59-6.47% by volume. The transparent substrate on which the nitrided-oxide film of molybdenum slicide is formed may be subjected to a heat treatment at a temperature of 200.degree. C. or more.

Phase-shifting photomask blank and method of manufacturing the same as

A phase-shifting photomask blank is made by sputtering a target of molybdenum silicide with a sputtering gas to which nitric monoxide is added in a ratio of 2.65-6.47% by volume. A nitrided-oxide film of molybdenum silicide as a phase-shifting film is formed on a transparent substrate. A base phase-shifting film may be formed on a transparent substrate and then a nitrided-oxide film of molybdenum silicide as a surface layer may be formed on top of the base phase-shifting film by sputtering a target of molybdenum silicide with a sputtering gas to which nitric monoxide is added in a ratio of 0.59-6.47% by volume. The transparent substrate on which the nitrided-oxide film of molybdenum slicide is formed may be subjected to a heat treatment at a temperature of 200.degree. C. or more.

Method of manufacturing phase-shifting photomask blank

A phase-shifting photomask blank has a transparent substrate, a phase-shifting film deposited on the transparent substrate, the phase-shifting film including a transversely central composition which results in a reduced rate of side etching, and a patterned photoresist film masking the phase-shifting film. When the phase-shifting film is dry-etched through the patterned photoresist film into a desired circuit pattern, transversely different rates of side etching of the phase-shifting film are substantially equalized due to the reduced rate of side etching resulting from the transversely central composition. The circuit pattern includes openings defined by removal of the phase-shifting film and shifters left between the openings. The shifters have respective side surfaces free of steps and extending substantially perpendicularly from the transparent substrate. If the phase-shifting film comprises a film of molybdenum silicide oxide nitride deposited by sputtering, then the proportion of a nitrogen mono oxide gas in a sputtering gas is adjusted to control the transversely central composition of the phase-shifting film.

Phase-shifting photomask blank, phase-shifting photomask, and method of

A phase shift mask of the present invention includes a quartz substrate transmitting exposure light, a transmitting film having a predetermined transmittance formed on the main surface of quartz substrate, a light transmitting portion from which quartz substrate is exposed is formed in a predetermined region, and a phase shifter portion formed of a single material on light transmitting film converting the phase angle by approximately 180.degree. and having a transmittance of 3-20% with respect to the exposure light transmitted through light transmitting portion. As a result, a defect generated in the phase shifter portion can be easily detected with an ordinary defect inspection apparatus without deteriorating the phase shifter portion as a phase shift mask.

Growing community of inventors

Saitama, Japan

Susumu Kawada