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    • 9. 发明专利
    • INTEGRATED-CIRCUIT SEMICONDUCTOR DEVICE
    • JPH01235369A
    • 1989-09-20
    • JP6038388
    • 1988-03-16
    • HITACHI LTD
    • MORIKAWA MASATOSHIYOSHIDA ISAOKAWAMOTO YOSHIFUMIKOJIMA KOJIOKABE TAKEAKI
    • H01L21/8247H01L21/336H01L21/822H01L21/8234H01L27/04H01L27/08H01L27/088H01L27/115H01L29/78H01L29/788H01L29/792
    • PURPOSE:To make a microminiaturized MOSFET and a transistor of high breakdown strength and for power coexist by making an LDD structure MOSFET and a lateral type power MOSFET coexist and simultaneously forming a low impurity concentration layer for LDD structure and an offset layer for the power MOSFET under the same conditions of formation. CONSTITUTION:The surface of a P-type substrate 3 is oxidized, then a P-type well layer 4 is shaped through well-photoetching, the implantation of B ions and drive-in, and LOCOS isolation is preformed through the deposition of Si3N4, L-photoetching and thermal oxidation. A gate oxide film 9 is formed, the deposition of polycrystalline Si, phosphorus treatment and the photoetching of a gate electrode are performed, and P ions are implanted 17. A side-wall 10 for the gate electrode 9 is shaped through the deposition of a high-temperature low-pressure oxide film and anisotropic etching, P ions are implanted 19 through a photoetching process 18, and a high-concentration N-type layer 5 is formed. A high-concentration P-type layer 6 is shaped, and an insulating film 12 is deposited. The boring of a contact hole, the wiring of an Al first layer 13, the deposition of an inter-layer insulating film 14, the boring of a through-hole, the wiring of an Al fist layer 15 and the formation of a protective film 16 are successively executed. Accordingly, an LDD structure MOSFET and a lateral type power MOSFET can be made to coexist through a simple process.