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Characterization of AlAsSb avalanche photodiodes (APDs) with avalanche region widths of 80 and 230 nm showed that electron ionization coefficient is slightly higher than that for hole. The avalanche gain at a given bias is marginally higher under pure electron injection, achieved using 442-nm laser, compared to those measured under mixed carrier injections using 542- and 633-nm lasers. Low-excess-noise...
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