ADVANCED TRANSISTORS WITH THRESHOLD VOLTAGE SET DOPANT STRUCTURES
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United States of America Patent
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Nov 26, 2015
app pub date -
Jul 29, 2015
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Sep 30, 2009
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Abstract
An advanced transistor with threshold voltage set dopant structure includes a gate with length Lg and a well doped to have a first concentration of a dopant. A screening region is positioned between the well and the gate and has a second concentration of dopant greater than 5×1018 dopant atoms per cm3. A threshold voltage set region is formed by placement of a threshold voltage offset plane positioned above the screening region. The threshold voltage set region may be formed by delta doping and have a thickness between Lg/5 and Lg/1 The structure uses minimal or no halo implants to maintain channel dopant concentration at less than 5×1017 dopant atoms per cm3.
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