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Measurements of the dc photoconductivity of chromium-doped semi-insulating GaAs have been made in the wavelength range 0.5–2.0 μ at temperatures of 290° and 80°K. High photoconductive gains of greater than 1000 have been observed with a low light level response extending to less than 10−14 W. A sharp peak in the response is observed at a wavelength of 1.40–1.45 μ having an external photoconductive gain of the same order of magnitude as that at the band edge. Possible mechanisms for this peak are discussed.
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R. F. Broom (1967) studied this question.
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