Reports to date of GaN HEMTs subjected to forward gate bias stress include varied extents of degradation.We report an extremely\r\nrobust GaN HEMT technology that survivedââ?¬â?contrary to conventional wisdomââ?¬â?high forward gate bias (+6V) and current\r\n(>1.8 A/mm) for >17.5 hours exhibiting only a slight change in gate diode characteristic, little decrease in maximum drain current,\r\nwith only a 0.1 V positive threshold voltage shift, and, remarkably, a persisting breakdown voltage exceeding 200 V.
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