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The lateral spread of implanted ions is measured in boron-implanted silicon by junction delineation. The maximum lateral spread of a p-type region from a mask edge is about half the junction depth. Typical values are 0.4–0.6 μ in n-type substrates of 0.1 Ω cm at an implantation energy in the range 75–250 keV with the dose level of 1×1015/cm2, or at 150 keV with the dose in the range 1×1014–5×1015/cm2. These experimental values are well interpreted by the theory in which the lateral spread is expressed as a complementary error function with the standard deviation calculated by the LSS theory.
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Akasaka et al. (1972) studied this question.
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