The demonstration of a prototype avalanche photodiode with a staircase band profile suggests that such devices may ultimately become a viable alternative to photomultiplier tubes in the infrared.
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David, J. The staircase photodiode. Nature Photon 10, 364–366 (2016). https://doi.org/10.1038/nphoton.2016.98
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DOI: https://doi.org/10.1038/nphoton.2016.98