Effects of buffer leakage current on breakdown characteristics in AlGaN/GaN HEMTs with a high-k passivation layer
Breakdown voltage of AlGaN/GaN HEMTs Vbr is estimated by two-dimensional simulation. Buffer leakage determines Vbr when passivation layers permittivity ?r is high. Vbr increases as ?r increases because the buffer leakage current is reduced. When the gate voltage is more negative, Vbr increases in the high ?r region.
buffer leakage current gan hemt high-k passivation layer breakdown voltage