Abstract

Single crystals of zinc oxide in the resistivity range 101 to 1010 ohm‐cm were prepared by hydrothermal crystallization using controlled lithium doping. Lithium concentration in the crystals ranged from 0.4 to 6 × 1018 atoms/cm3 when the LiOH concentration in the hydrothermal growth solutions ranged from 0 to 2.0 molal. The logarithm of the resistivity is nearly linear with the lithium concentration of the grown crystal. Calculations of apparent mobility show that either the donor concentration is a function of the lithium concentration during growth or not all the lithium in the grown crystals acts as acceptors. Crystals with resistivities as low as 10−2 ohm‐cm were prepared by doping with indium which acts as a donor. Crystals were grown in solutions containing NH4++ LiOH. The NH4+ had a negligible effect on resistivity but it markedly increased the rate of crystallization on the (1010) (prism) face. A study of the occasionally produced anomalous crystals grown in silver‐lined autoclaves showed that resistivity anomalies were not due to silver‐doping of the grown crystals.

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