A graded-gap photoelectric detector for ionizing radiation |
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Authors: | L Dapkus K Po?ela J Po?ela A ?il?nas V Jucien? V Jasutis |
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Affiliation: | (1) Institute of Semiconductor Physics, Vilnius, 01108, Lithuania |
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Abstract: | A heterostructure consisting of a graded-gap p-AlxGa1?xAs layer on an n-GaAs substrate is studied in relation to its role as a photoelectric-response detector of X-ray photons and α particles. It is found that the current-power sensitivity of the detector is as high as 0.13 A/W and the voltage-power sensitivity exceeds 106 V/W. The effect of preliminary irradiation with 5.48-MeV α particles (241Am) on the detector’s sensitivity is studied. It is established that the detector’s sensitivity is reduced by a factor of 1.5–2 after irradiation with α particles at a dose of 5 × 109 cm?2. A further increase in the radiation dose to 4 × 1010 cm?2 does not affect the detector’s sensitivity. |
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