A planar structure AlGaAs/GaAs PIN photodiode was fabricated by first using MOCVD. The p+-region was formed by Zn-diffusion in a high-resistivity AlGaAs window layer. The internal quantum efficiency, close to unity, and the cut-off frequency, as high as 1.2 GHz, have been demonstrated by 280 μm diameter devices.
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Ito et al. (1983) studied this question.
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