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Impact Ionization in InAs Electron Avalanche Photodiodes

Research output: Contribution to journalJournal article

Published

Journal publication date10/2010
JournalIEEE Transactions on Electron Devices
Journal number10
Volume57
Number of pages8
Pages2631-2638
Original languageEnglish

Abstract

A systematic study of impact ionization, avalanche multiplication, and excess noise in InAs diodes has been carried out, confirming that avalanche multiplication is dominated by the impact ionization of electrons. This results in highly desirable "electron avalanche photodiode" characteristics previously only demonstrated in HgCdTe diodes, which are discussed in detail. The suppression of excess noise by nonlocal effects, to levels below the local model minimum of F = 2, is explained. An electron ionization coefficient is calculated and shown to be capable of modeling the electron impact ionization, which differs characteristically from that in wider bandgap III-V materials.