Abstract:
A method of fabricating a dual damascene structure is provided comprising forming a photoresist layer on a dielectric layer. A mask including a region that light completely passes over, a region that light partially passes over and a dense region is used for exposure. A development step is carried out to remove the photoresist layer under the region that light completely passes over, to partially remove the photoresist layer under the region that light partially passes over and to leave the photoresist layer under the dense region. The photoresist layer remaining from the forgoing step and the dielectric layer are partially removed to form a via and a trench in the dielectric layer. The via and the trench are filled with metal to form a dual damascene structure.
Abstract:
A system and method to compensate for the proximity effects in the imaging of patterns in a photolithography process. A light exposure of a photoresist layer is effectuated in predetermined patterns through an exposure mask having light-transmissive openings in correspondence to the predetermined patterns. The exposure mask has areas densely populated with the light-transmissive openings and areas sparsely populated with the light-transmissive openings. Light is attenuated through the densely populated light-transmissive openings by a different amount than through the sparsely populated light-transmissive openings.
Abstract:
A method for characterizing line width roughness of printed features is provided. A wafer having thereon a plurality of gratings formed within a test key region is prepared. The wafer is transferred to a spectroscopic ellipsometry tool having a light source, a detector and a computer. A polarized light beam emanated from the light source is directed onto the gratings. Spectrum data of reflected light is measured and recorded. The spectrum data is compared to a library linked to the computer in real time. The library contains a plurality of contact-hole model based spectra created by incorporating parameter values that describes the line width roughness. The spectrum data is matched with the contact-hole model based spectra, thereby determining the parameter values.
Abstract:
A phase shifting mask is disclosed in this present invention. The above-mentioned phase shifting mask comprises a quartz layer and a plurality of transmission adjustor layer onto the quartz layer. By employing the above-mentioned phase shifting mask, the material of the transmission adjustors has not to be changed with the light source. Furthermore, the contrast of the phase shifting mask of this invention is better than the contrast of the binary mask and the half-tone mask in the prior art. Therefore, this invention provides a more efficient mask, and the phase shifting mask according to this present invention can improve the resolution in photolithography.
Abstract:
This invention provides a method of forming a multi-layer photo mask on a photo mask substrate. A first transparent layer comprising at least one vertical side wall is formed on at least one predetermined area of the photo mask substrate. A first opaque spacer is formed around the vertical side wall of the first transparent layer, and the top side of the first spacer is approximately leveled off with the upper surface of the first transparent layer. An external transparent layer is formed on the photo mask substrate and outside the predetermined area, and the upper surface of the external transparent layer is leveled off with that of the first transparent layer. So the first transparent layer and the external transparent layer form a first photo mask layer. A second transparent layer comprising at least one vertical side wall is formed on at least one predetermined area of the first photo mask layer. A second opaque spacer is formed around the vertical side wall of the second transparent layer, and the top side of the second spacer is approximately leveled off with the upper surface of the second transparent layer.
Abstract:
This invention provides a method of forming a node contact with self-alignment on a semiconductor wafer. The wafer comprises a substrate, a dielectric layer, and a first and a second bit lines. A first side wall of the first bit line is adjacent to a second side wall of the second bit line and comprises a first region and two second regions adjacent to the first region. The distance between the first region and the second side wall is greater than a predetermined value and the distance between the two second regions and the second side wall is less than the predetermined value. A second insulating layer is formed on the dielectric layer and two bit lines to form a groove over the gap between the first region and the second side wall. A first anisotropic etching is performed to extend the bottom of the groove down to the dielectric layer. The remaining second insulating layer around the groove forms a spacer, and the remaining second insulating layer in the gaps between the two second regions and the second side wall still completely covers the surface of the two gaps. A second anisotropic etching process is performed to remove the dielectric layer at the bottom of the groove in a vertical direction down to the substrate so as to form the node contact.
Abstract:
A photolithography technique. A chip has latitudinal scribe lines and longitudinal scribe lines and also has a plurality of alignment marks. The latitudinal scribe lines and longitudinal scribe lines divide the chip into a plurality of dies. Some dies are effective dies. Alignment marks are located at each intersection of the latitudinal and longitudinal scribe lines. Each shot contains a plurality of dies. A mask having a plurality of mask alignment marks is provided. The mask alignment marks are used for alignment with alignment marks in the chip. The alignment marks of the chip are aligned with the mask alignment marks of the mask. At least three alignment marks close to the effective dies in the shots are selected for detection a focus and focal plane of each shot, so as to level the shot and perform an exposure step on each shot, shot by shot.
Abstract:
A half-tone phase shifting mask (HTPSM) with a back surface blind border alignment mark includes a shifter layer with a desired pattern on one surface of a transparent substrate, and a light shielding layer with a mark opening on another surface of the transparent substrate. In this case, the light ray passing through the mark opening is partially shielded by the shifter layer so that there is no light amplitude subtraction within the mark opening.
Abstract:
A method for fabricating an alternating phase shifting mask includes a transparent substrate, a number of oblique layers formed on the transparent substrate, and a number of embedded phase shift layers inside the transparent substrate. Then, a photolithography process is applied to form a photoresist layer on the transparent substrate corresponding to a desired pattern and, therefore, exposing a portion of the transparent substrate. Then, an ion implantation process utilizing the photoresist layer as a mask is applied to form the embedded phase shift layers and the photoresist layer is removed after ion implantation. The embedded phase shift layers are formed in alternating positions in the transparent portion between the oblique layers.
Abstract:
To avoid the yield of wafers that undergo immersion lithography influencing by delay of post exposure baking (PEB), an operation system adjusts a speed of inputting the wafers to undergo immersion lithography according to a status of wafers that have finished exposure and are waiting for baking. Therefore, the wafers that have finished exposure are transmitted to be baked efficiently and on time.