Collins, Xiao and Craig, Adam Patrick and Roblin, T. and Marshall, Andrew Robert Julian (2018) Impact ionisation in Al0.9Ga0.1As0.08Sb0.92 for Sb-based avalanche photodiodes. Applied Physics Letters, 112 (2): 021103. ISSN 0003-6951
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Abstract
We report the impact ionisation coefficients of the quaternary alloy Al0.9Ga0.1As0.08Sb0.92 lattice matched to GaSb substrates within the field range of 150 to 550 kV cm-1 using p-i-n and n-i-p diodes of various intrinsic thicknesses. The coefficients were found with an evolutionary fitting algorithm using a non-local recurrence based multiplication model and a variable electric field profile. These coefficients not only indicate that an avalanche photodiode can be designed to be function in the mid-wave infrared, but also can be operated at lower voltages. This is due to the high magnitude of the impact ionisation coefficients at relatively low fields compared to other III-V materials typically used in avalanche multiplication regions.