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ENHANCED RESURF HVPMOS DEVICE WITH STACKED HETERO-DOPING RIM AND GRADUAL DRIFT REGION
ENHANCED RESURF HVPMOS DEVICE WITH STACKED HETERO-DOPING RIM AND GRADUAL DRIFT REGION
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机译:具有堆叠的异质掺杂RIM和渐变区域的增强型恢复HVPMOS器件
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摘要
An HV PMOS device formed on a substrate having an HV well of a first polarity type formed in an epitaxial layer of a second polarity type includes a pair of field oxide regions on the substrate and at least partially over the HV well. Insulated gates are formed on the substrate between the field oxide regions. Stacked hetero-doping rims are formed in the HV well and in self-alignment with outer edges of the gates. A buffer region of the first polarity type is formed in the HV well between and in self-alignment with inner edges of the gates. A drift region of the second polarity type is formed in the buffer region between and in self-alignment with inner edges of the gates. The drift region includes a region having a gradual dopant concentration change, and includes a drain region of the second polarity type.
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