Abstract

Positron lifetime and Doppler-broadening measurements have been used to study vacancy defects in n-type GaP. Vacancies in the P sublattice with a concentration of some 1017 cm−3 were observed in as-grwon GaP. The vacancies disappear during annealing at 500–800 °C. In neutron-irradiated GaP positrons are trapped by Ga vacancies which anneal out in two stages situated at 300–550 °C and 550–700 °C.

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