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The dependence of free-carrier lifetime on erbium concentration has been measured in molecular-beam epitaxial GaAs epilayers doped with erbium. A gradual reduction in the lifetime is observed with increased dopant incorporation. For a high doping concentration in the range of 1019 cm−3 or greater, a carrier lifetime of ∼1 ps is obtained. Due to the high resistivity of these epilayers, they can also be used as a photoconductive switch, with good responsivity. This leads to new and novel applications for rare-earth doped III-V semiconductors.

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