Analysis of buffer-related lag phenomena and current collapse in GaN FETs

K. Itagaki, N. Kobayashi, Kazushige Horio

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Abstract

Drain-current responses of GaN MESFETs with a semi-insulating buffer layer are calculated when the drain voltage and/or the gate voltage are changed abruptly, and pulsed I-V curves are derived from them. It is shown that so-called current collapse or current slump is not so dependent on the gate length LG (0.3 μm - 1 μm), and this is essentially determined by a deep-acceptor density NDA in the buffer layer. LG and NDA dependence of gate lag is also studied, indicating that the gate lag is weaker for longer LG and the lag rate becomes high with NDA, although it may show a saturation behaviour.

Original languageEnglish
Pages (from-to)2666-2669
Number of pages4
JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
Volume4
Issue number7
DOIs
Publication statusPublished - 2007

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ASJC Scopus subject areas

  • Condensed Matter Physics

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