Method for preparing vertical double-diffusion MOS transistor
A MOS transistor, vertical double-diffusion technology, applied in semiconductor/solid-state device manufacturing, electrical components, circuits, etc., can solve problems such as high process accuracy requirements and limited improvement in Miller capacitance, to improve switching speed and shorten charging. Discharge time, the effect of reducing dynamic loss
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[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0024] figure 2 It is a schematic flow chart of the preparation method of the vertical double-diffused MOS transistor provided by the present invention.
[0025] In this specific embodiment, the preparation method of the vertical double-diffused MOS transistor structure 300 includes the following steps:
[0026] In step 1, a semiconductor substrate 310 is provided, and an epitaxial layer 320 is grown on the surface of the semiconductor substrate 310 .
[0027] In this step, if Figure 3a As shown, the semiconductor substrate 310 and the epitaxial layer 320 involved are both doped with the first semiconductor type, wherein the epitaxial layer 320 is located on the surface of the semiconductor substrate 310, and the doping concentration of the semiconductor subst...
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