The multi-step heterojunction device is said to have lower excess noise than the regular APDs and can operate at room temperature:
Tuesday, June 08, 2021
Multi-Step Avalanche PD
Electropages, University of Texas in Austin: Engineers from The University of Texas at Austin and the University of Virginia created a new first-of-its-kind APD with multi-step staircase avalanche that makes sure that only electrons are multiplied, while holes are not.
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