Abstract
Interpretation of reflectivity data from the surface of a semiconductor containing an impurity gradient and, in particular, a p‐n junction is of practical importance. Current theories predict a shift in the wavelength of the reflection minimum to shorter wavelengths. In this theory and subsequent measurements, such behavior was not observed; in fact, almost no shift of wavelength occurred even for the most lightly doped and shallow junction samples. The results obtained indicate that the surface free‐carrier concentration can be obtained directly from a reflectivity measurement.

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