Abstract:
The inventive concept provides apparatuses and methods for monitoring semiconductor fabrication processes in real time using polarized light. In some embodiments, the apparatus comprises a light source configured to generate light, a beam splitter configured to reflect the light toward the wafer being processed, an objective polarizer configured to polarize the light reflected toward the wafer and to allow light reflected by the wafer to pass therethrough, a blaze grating configured to separate light reflected by the wafer according to wavelength, an array detector configured to detect the separated light and an analyzer to analyze the three-dimensional profile of the structure/pattern being formed in the wafer.
Abstract:
An apparatus for fabricating semiconductor devices is provided. The apparatus includes a process equipment in which a process is performed and a transfer system attached to the process equipment to supply a substrate to the process equipment. The transfer system includes a transfer robot for moving the substrate and a light supplier for supplying ultraviolet rays to the substrate. Methods of fabricating the semiconductor devices using the apparatus are also provided.
Abstract:
A method for selecting reference images, a method and an apparatus for inspecting patterns on a wafer, and a method for dividing a wafer into application regions. In a method for inspecting patterns according to at least one exemplary embodiment of the present invention, a plurality of reference dies may be selected and a difference in gray levels of images of the references dies may be determined. The reference dies may include a first die substantially centrally located on the wafer and at least one second die located at an edge portion of the wafer. One reference image is selected if the difference in gray levels is within a permitted tolerance and more than one reference image may be selected if the difference in gray levels is not within the permitted tolerance. A pattern inspection may be performed using the reference images.
Abstract:
According to a method of optimizing a focus of an optical inspection apparatus, a first light is irradiated onto a substrate. Then, the first light is reflected on the substrate to form a second light. The second light is sensed with various foci to form image information corresponding to each of the foci. Then, a relation between foci of the optical inspection apparatus and gain value corresponding to the image information is obtained. Then, the focus corresponding to a minimum gain value is set up as an optimized focus. Thus, a focus of an optical inspection apparatus is accurately adjusted to enhance efficiency of defecting defects, so that defects of semiconductor apparatus are more accurately detected.
Abstract:
A method of in-line monitoring for shallow pits formed on a semiconductor substrate using an electron beam. The electron beam is scanned across exposed pads on the semiconductor substrate and relative concentrations of secondary electrodes are examined to identify shallow pits.
Abstract:
An apparatus for detecting particles located on an object includes an emitter for irradiating lights to the particles. The object is disposed on a stage in a direction substantially parallel to a surface of the object. The apparatus further includes a driver for generating a relative motion between the emitter and the object for scanning the surface of the object with the lights and a detector for detecting the lights emitted from the emitter or lights scattered from the particle. With embodiments of the present invention, the particles can be quickly detected.
Abstract:
A light is irradiated on a wafer including a plurality of pixels. Image information corresponding to each pixel is measured by sensing the light reflected by the wafer surface. A raw datum is calculated by subtracting the image information of a corresponding pixel from the image information of a target pixel. The target pixel is a subject pixel for detecting a defect. The corresponding pixel is a pixel located in a first device unit and corresponds to the target pixel. The first device unit is located adjacent to a second device unit that includes the target pixel. The threshold region is preset to have at least one pair of upper and lower limits. The target pixel is marked as a defective pixel when the raw datum thereof is included in the threshold region. Accordingly, the killer defect can be detected separate from the non-killer defects that are usually detected together with the killer defects.
Abstract:
A method for forming a semiconductor wafer such as a standard semiconductor wafer used in a surface analysis system. Openings may be formed by partially etching a semiconductor substrate, and an insulation film may be formed on the openings. Contact holes may be formed to expose portions of the semiconductor substrate and the insulation film in the openings. The contact holes may be inspected by the surface analysis system, and the reliability of data obtained from the surface analysis system may be more precisely discriminated.
Abstract:
The present invention provides apparatus and methods for detecting defects in a semiconductor device. The semiconductor device includes a plurality of conductive pads, which may be formed, for example, between insulating layers for insulating the conductive pads from conductive lines formed between ones of the conductive pads. Electrons and/or holes are accumulated in ones of the conductive pads, for example, on the surface of the conductive pads. A contrast associated with one of the conductive pads is detected based on secondary electron emissions from the ones of the conductive pads after accumulation of the electrons and/or holes. The presence of defects is determined based on the detected contrast.
Abstract:
Methods of inspecting integrated circuit substrates include the steps of directing a beam of electrons into a first conductive plug located within a first contact hole on an integrated circuit substrate and then measuring a quantity of electrons emitted from the first conductive plug to determine an absence or presence of an electrically insulating residue in the first contact hole. The quantity of electrons emitted from the first conductive plug by secondary electron emission can be measured in order to determine whether electrons are being accumulated within the conductive plug because an insulating residue is blocking passage of the electrons into an underlying conductive portion of the substrate. If an electrically insulating residue is present, then sufficient repulsive forces between the accumulated electrons will result in the secondary emission of excess electrons from an upper surface of the conductive plug as the conductive plug is being irradiated with the electron beam. A detector can then be used to measure the quantity of the emitted electrons against a threshold level, in order determine whether the quantity of electrons emitted by secondary emission is sufficient to indicate that an insulating residue is present in the contact hole.