摘要:
A lithographic apparatus comprises an illumination system, an array of individually controllable elements, a projection system, a substrate table, and a sensor system. The illumination system supplies a beam of radiation. The array of individually controllable elements patterns the beam. The projection system projects the patterned beam onto a target plane, the patterned beam comprising an array of radiation spots. The substrate table supports a substrate, such that a target surface of the substrate is substantially coincident with the target plane. The sensor system comprises an array of detector elements arranged to receive at least one of the spots. The sensor system measures an energy of the or each received spot and provides an output signal indicative of the energy of the or each received spot.
摘要:
A system and method for use in a lithographic environment include an illumination system for supplying a projection beam of radiation, an array of individually controllable elements for patterning the beam, a projection system for projecting the patterned beam onto a target plane, and a substrate table for supporting a substrate such that a target surface of the substrate is coincident with the target plane. The projection system comprises at least one component, including at least an array of lenses arranged so that each lens receives and focuses a respective portion of the patterned beam. The array of lenses projects a radiation pattern onto the target plane. The apparatus also includes a sensor system arranged to detect an intensity distribution of the projected radiation pattern and to provide a corresponding intensity signal, and a positioning system controllable to adjust a position and/or an orientation of at least one of the following: the array of elements; a component of the projection system; and the illumination system. The apparatus also includes a control system which controls the array of elements to pattern the beam, and which also to receives the intensity signal and controls the positioning system according to the detected intensity distribution to adjust the projected radiation pattern, for example to align the patterned beam with the lens array.
摘要:
An imprint lithography apparatus is disclosed which has a needle, and a substrate table arranged to hold a substrate to be imprinted, wherein the needle is moveable between a first position and a second position, the first position being such that in use the needle penetrates a layer of imprintable material on the substrate, and the second position being such that in use the needle is disengaged from the imprintable material on the substrate, the substrate table and the needle arranged such that one may be scanned relative to the other.
摘要:
An optical element is placed in the alignment beam during alignment. The optical element serves to focus the alignment beam onto the substrate alignment mark when it is at a different focal length from the front surface of the substrate.
摘要:
A lithographic projection apparatus is provided with an optical system built into the wafer table for producing an image of a wafer mark that is provided on the back side of the wafer. The image is located at the plane of the front side of the wafer and can be viewed by an alignment system from the front side of the wafer. Simultaneous alignment between marks on the back and front of the wafer and a mask can be performed using a pre-existing alignment system. The lithographic projection apparatus is further provided with immersion system for providing a fluid between the lens and the substrate.
摘要:
In one embodiment, front to back side alignment optics are used to project a mark on the back side of a substrate. The front to back side alignment optics are arranged such that the image projected into the image window of the front to back side alignment optics is a translational replica of the mark on the back side of the substrate. One potential advantage of such an arrangement is that any slight inaccuracies in the location of the optical axis do not result in inaccuracies in the image of the substrate mark. The translational replica image can be used for alignment of the substrate.
摘要:
To calibrate a front-to-backside alignment system a transparent calibration substrate with reference markers on opposite sides is used. A plane plate is inserted to displace the focal position of the alignment system from the top to bottom surface of the calibration substrate.
摘要:
In a direct electron detector, backscattering of electrons into the detector volume from below the sensor is prevented. In some embodiments, an empty space is maintained below the sensor. In other embodiments, a structure below the sensor includes geometry, such as multiple high aspects ratio channels, either extending to or from the sensor to trap electrons, or a structure of angled surfaces to deflect the electrons that pass through the sensor.
摘要:
An imprint lithography apparatus is disclosed which has a needle, and a substrate table arranged to hold a substrate to be imprinted, wherein the needle is moveable between a first position and a second position, the first position being such that in use the needle penetrates a layer of imprintable material on the substrate, and the second position being such that in use the needle is disengaged from the imprintable material on the substrate, the substrate table and the needle arranged such that one may be scanned relative to the other.
摘要:
The invention relates to a device manufacturing method comprising identifying a substrate to be processed, performing a manufacturing step of a patterned layer on the substrate, and storing a substrate process history for the substrate. The history may comprise a correction map comprising position errors caused by the manufacturing step. Identifying the substrate may be done by reading an identification sign present on the substrate or by reading an identification code of a lot comprising the substrate and determining a sequence number of the substrate in the lot. Alignment of the substrate with respect to a patterning device of a lithographic apparatus may be corrected using information of the substrate process history. Alternatively or additionally, measured overlay errors may be corrected per substrate using information of the substrate process history.