Hitachi-high-technologies Corporation

Other

Kenji Mitomo

Takashi Okawa

Kenji Oka

Minori Noguchi

Hidetoshi Nishiyama

Akira Hamamatsu

Yoshimasa Ohshima

Shinichi Suzuki

Kenichiro Komeda

While an illumination optical system is irradiating the surface of a contaminated standard wafer with illumination light, this illumination light is scanned over the surface of the contaminated standard wafer, then detectors of a detection optical system each detect the light scattered from the surface of the contaminated standard wafer, next a predefined reference value in addition to detection results on the scattered light is used to calculate a compensation parameter 'Comp' for detection sensitivity correction of photomultiplier tubes of the detectors, and the compensation parameter 'Comp' is separated into a time-varying deterioration parameter &#x201c;P&#x201d;, an optical characteristics parameter &#x201c;Opt&#x201d;, and a sensor characteristics parameter &#x201c;Lr&#x201d;, and correspondingly managed. This makes is easy to calibrate the detection sensitivity.

Surface inspecting apparatus and method for calibrating same

This application relates to an inspection apparatus including: a stage which holds a specimen; an illumination optical system which illuminates a surface of the specimen held on the stage, with illumination light; a dark-field optical system which detects scattered light generated by the illumination light with which the specimen is illuminated; a photoelectric converter which converts the scattered light detected by the dark-field optical system, into an electric signal; an A/D converter which converts the electric signal obtained by conversion by the photoelectric converter, into a digital signal; a judgement unit which determines the dimension of a foreign substance on the surface of the specimen on the basis of a magnitude of the scattered light from the foreign substance; and a signal processor which determines an inspection condition by use of information on the scattered light from the specimen surface.

Inspection method and inspection apparatus

When measuring an edge region, a photo detector with an angle not influenced by the diffracted light, the diffracted light causing noise, is selected to thereby allow for inspection that minimizes the sensitivity reduction. This allows for the management of foreign matters in the outer peripheral portion, which conventionally could not be measured, and this also eliminates the oversight of critical defects on the wafer, thus leading to reduction of failures of IC.

Surface inspection method and surface inspection apparatus

An apparatus and method for detecting foreign particle and defect on an object in detection by means of a laser beam, in which the laser beams of different wavelengths are irradiated onto the surface of the object in detection from different angles and the state of foreign particle and defect is separately detected according to the output level of the scattered light reflected from that surface. Further, it is arranged such that the scattered light reflected from the object onto which the laser beam is irradiated from the sole source or the plurality of sources is detected in plural directions, which detecting result is compared for the detection of the directivity of said scattered light in reflection.

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Hitachinaka, Japan

Kenji Mitomo