Effect of Li-B Ion Pairing on Li+ Ion Drift in Si

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Abstract
When Li+ and B− ions are present simultaneously in Si, relatively immobile Li‐B ion pairs are formed. Only those Li+ ions which have not become paired with B− are free to diffuse through the Si, and measurement of the effective diffusion rate of the Li+ can thus be used to determine the fraction of Li+ paired. Such measurements have been made in the range 2°–100°C using the method of ion drift in a pn junction. The results agree well with the Reiss model for ion pairing, yielding a distance of closest approach between Li+ and B− of 2.5–2.7 A. This value is larger than given by the sum of Li+ and B− radii; it is roughly equal to the distance from a lattice‐atom site to the next‐nearest interstitial site (2.72 A). The kinetics of the ion‐pairing reaction have been investigated by the same technique. The resulting value for the capture radius of the B− ion agrees satisfactorily with theory.

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