Monte Carlo transport analysis to assess intensity dependent response of a carbon-doped GaN photoconductor

W. Milestone, D. Guo, M. Sanati, K. M. Dowling, S. Hau-Riege, L. F. Voss, A. Conway, R. P. Joshi

Research output: Contribution to journalArticlepeer-review

Abstract

Evaluation of the photoresponse in wurtzite GaN photoconductive switches is presented based on kinetic Monte Carlo simulations. The focus is on electron transport physics and assessment of high frequency operation. The roles of GaN band structure, Pauli exclusion, and treatment of internal fields based on the fast multipole method are all comprehensively included. The implementation was validated through comparisons of velocity-field characteristics for GaN with computational results in the literature. Photocurrent widths of less than ∼7 ps for the 1 μm device can be expected, which translates into a 100 GHz upper bound. Photocurrent pulse compression below the laser full width at half maxima at high applied fields are predicted based on the interplay of space-charge effects and the negative differential velocity characteristics of GaN.

Original languageEnglish
Article number195703
JournalJournal of Applied Physics
Volume129
Issue number19
DOIs
StatePublished - May 21 2021

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