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Fabrication of abrupt ultra-shallow junctions










Image Number 6 for United States Patent #6852603.

One aspect of the invention relates to a method of forming P-N junctions within a semiconductor substrate. The method involves providing a temporary impurity species, such as fluorine, within the semiconductor crystal matrix prior to solid source in-diffusion of the primary dopant, such as boron. The impurity atom is a faster diffusing species relative to silicon atoms. During in-diffusion, the temporary impurity species acts to reduce the depth to which the primary dopant diffuses and thereby facilitates the formation of very shallow junctions.








 
 
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