Abstract:
Provided is a structure for testing the strip width of a scribing slot, comprising a first sparse strip (232) and a second sparse strip (234) which are perpendicular to each other, and also comprising a first field region pattern (220), wherein the first field region pattern (220) comprises two graphics, which are respectively located at the side of the first sparse strip (232) and are oppositely provided. Further provided is a method for testing the strip width of a scribing slot. By setting a graphic of a field oxide region simulating an LOCOS structure at both sides of sparse strips, a step structure is artificially generated. Photoetched polysilicon gate graphics on a small-size active region can be reproduced in time through an on-line strip width test or inspection, so as to truly reflect a practical situation in a tube core, so that the anomaly of the strip width and the morphology of the polysilicon gate caused by substrate reflection can be found in time.
Abstract:
A semiconductor device includes a substrate, an active region located in the substrate, a plurality of field limiting rings (402) formed in the substrate and located outside the active region, a plurality of isolation trenches (401) formed between the field limiting rings (402), and a connection channel (403) electrically connecting at least two adjacent isolation trenches (401).
Abstract:
A trench metal-oxide-semiconductor field-effect transistor (MOSFET) device (400) is provided. The trench MOSFET device (400) includes a substrate (406), a body region (411), a source region (410), a dielectric layer (408), a metal layer (409), a contact hole (413) and a trench structure (412). The substrate includes a substrate layer (406) and an epitaxial layer (407) formed on the substrate layer (406); the body region (411) is formed in the epitaxial layer (407); and the source region (410) is formed in the body region (411) of the epitaxial layer (407). Further, the dielectric layer (408) is formed on the epitaxial layer (407); the metal layer (409) is formed on the dielectric layer (408); and the contact hole (413) is formed in the epitaxial layer (407) to connect the source region (410) with the metal layer (409). In addition, the trench structure (412) is formed in the epitaxial layer (407) and includes a first trench that is pectinate trench including a plurality of tooth trenches and a bar trench interconnecting the tooth trenches.
Abstract:
A method is provided for fabricating a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET, 200) on a semiconductor wafer. The method includes providing a substrate containing an epitaxial layer (201), forming a gate oxide layer (203) on a surface of the epitaxial layer (201) by a first oxidization process, forming a polysilicon gate (202) on the gate oxide layer (203) within a gate region, forming a body region (205) in the epitaxial layer (201), forming a source region (204) in the body region (205) of the epitaxial layer (201), and oxidizing the source region (204) to form oxide (207) in a gap between the polysilicon gate (202) and the source region (204) on a surface of the source region (204) by a second oxidization process.
Abstract:
A Vertical Double-diffused Metal-Oxide-Semiconductor (VDMOS) device and a method for fabricating the same are provided. The VDMOS device includes a substrate which includes a body layer (201) and an epitaxial layer (202) formed over the body layer (201). The body layer (201) has a drain region. The VDMOS device further includes an isolating region (203) formed in the epitaxial layer (202), a first body region (204) and a second body region (205) formed in the epitaxial layer (202) and located at two sides of the isolating region (203), a first source region (206) and a second source region (207) formed in the first body region (204) and the second body region (205) respectively, and a gate region formed above the isolating region (203) and located between the first source region (206) and the second source region (207).
Abstract:
An LDMOS device and a method for fabricating the same are disclosed in embodiments of the present invention. The device includes: a substrate including an epitaxial layer and a well region located in a surface of the epitaxial layer; a source region located in the well region, and a drain region located in the epitaxial layer; a first region and a second region located in the surface of the epitaxial layer and having doping states different from a doping state of the epitaxial layer, where the first region and the second region are located in a drift region between the source region and the drain region, and have different doping states; a field oxide layer located above the first region and the second region; and a gate region located on the well region and the field oxide layer. In the present invention, by replacing the drift region with only one doping state in the prior art with the first region and the second region having different doping states, the doping states of the first region and the second region can be adjusted according to the requirements for the breakdown voltage and the on-resistance, so that the on-resistance is further decreased and the power consumption of the device is reduced while a high breakdown voltage is ensured.