Abstract

The majority-carrier Hall mobility has been measured in thin, single-crystal silicon films defined by electrochemical etching. Both n-type and p-type films with dopant concentrations of about 10 15 cm −3 were studied. The mobilities observed in p-type thin films and in epitaxial control samples were almost identical while the mobilities measured in n-type films were markedly less than those in epitaxial control samples. This apparent anomaly is attributed to the presence of an n-type surface-charge layer with lower carrier mobility near the bottom of the thin films, although it may possibly be related to voids formed in the n-type films. Measurements on very thin samples indicated that an t-type surface layer is left on the top surface of p-type films immediately after electrochemical etching.

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